From 15179878d57addb010b5afeadd4bde8b62ef3acb Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jarka=20Kadlecov=C3=A1?= <jarka@gitlab.com>
Date: Mon, 16 Jul 2018 15:35:19 +0200
Subject: Revert "Revert "Merge branch 'ee-5481-epic-todos' into 'master'""

This reverts commit 8717c7dad9b5a8fa21ec9a652c54718a6b4c2175.
---
 .../pages/dashboard/todos/index/todos.js           |  12 +-
 .../sidebar/components/todo_toggle/todo.vue        |  98 +++++++++++++
 .../components/sidebar/toggle_sidebar.vue          |   7 +
 app/assets/stylesheets/pages/issuable.scss         |   1 +
 app/assets/stylesheets/pages/todos.scss            |  16 +++
 app/controllers/concerns/todos_actions.rb          |  12 ++
 app/controllers/dashboard/todos_controller.rb      |   2 +-
 app/controllers/projects/todos_controller.rb       |  14 +-
 app/finders/todos_finder.rb                        |  52 +++++--
 app/helpers/issuables_helper.rb                    |  13 ++
 app/helpers/todos_helper.rb                        |  10 +-
 app/models/concerns/issuable.rb                    |   6 +
 app/models/group.rb                                |   8 ++
 app/models/issue.rb                                |   4 -
 app/models/note.rb                                 |   4 +
 app/models/todo.rb                                 |  11 +-
 app/services/todo_service.rb                       |  30 ++--
 app/views/dashboard/todos/index.html.haml          |  48 ++++---
 db/migrate/20180608091413_add_group_to_todos.rb    |  32 +++++
 db/schema.rb                                       |   5 +-
 doc/api/todos.md                                   |   1 +
 doc/workflow/todos.md                              |   1 +
 lib/api/entities.rb                                |  13 +-
 spec/controllers/projects/todos_controller_spec.rb | 133 +++--------------
 spec/factories/todos.rb                            |   4 +-
 spec/finders/todos_finder_spec.rb                  |  64 +++++++++
 spec/helpers/issuables_helper_spec.rb              |  21 +++
 spec/javascripts/sidebar/todo_spec.js              | 158 +++++++++++++++++++++
 spec/models/todo_spec.rb                           |   1 +
 .../controllers/todos_shared_examples.rb           |  43 ++++++
 30 files changed, 640 insertions(+), 184 deletions(-)
 create mode 100644 app/assets/javascripts/sidebar/components/todo_toggle/todo.vue
 create mode 100644 app/controllers/concerns/todos_actions.rb
 create mode 100644 db/migrate/20180608091413_add_group_to_todos.rb
 create mode 100644 spec/javascripts/sidebar/todo_spec.js
 create mode 100644 spec/support/shared_examples/controllers/todos_shared_examples.rb

diff --git a/app/assets/javascripts/pages/dashboard/todos/index/todos.js b/app/assets/javascripts/pages/dashboard/todos/index/todos.js
index ff19b9a9c30..9aa83ce6269 100644
--- a/app/assets/javascripts/pages/dashboard/todos/index/todos.js
+++ b/app/assets/javascripts/pages/dashboard/todos/index/todos.js
@@ -39,6 +39,7 @@ export default class Todos {
   }
 
   initFilters() {
+    this.initFilterDropdown($('.js-group-search'), 'group_id', ['text']);
     this.initFilterDropdown($('.js-project-search'), 'project_id', ['text']);
     this.initFilterDropdown($('.js-type-search'), 'type');
     this.initFilterDropdown($('.js-action-search'), 'action_id');
@@ -53,7 +54,16 @@ export default class Todos {
       filterable: searchFields ? true : false,
       search: { fields: searchFields },
       data: $dropdown.data('data'),
-      clicked: () => $dropdown.closest('form.filter-form').submit(),
+      clicked: () => {
+        const $formEl = $dropdown.closest('form.filter-form');
+        const mutexDropdowns = {
+          group_id: 'project_id',
+          project_id: 'group_id',
+        };
+
+        $formEl.find(`input[name="${mutexDropdowns[fieldName]}"]`).remove();
+        $formEl.submit();
+      },
     });
   }
 
diff --git a/app/assets/javascripts/sidebar/components/todo_toggle/todo.vue b/app/assets/javascripts/sidebar/components/todo_toggle/todo.vue
new file mode 100644
index 00000000000..ffaed9c7193
--- /dev/null
+++ b/app/assets/javascripts/sidebar/components/todo_toggle/todo.vue
@@ -0,0 +1,98 @@
+<script>
+import { __ } from '~/locale';
+import tooltip from '~/vue_shared/directives/tooltip';
+
+import Icon from '~/vue_shared/components/icon.vue';
+import LoadingIcon from '~/vue_shared/components/loading_icon.vue';
+
+const MARK_TEXT = __('Mark todo as done');
+const TODO_TEXT = __('Add todo');
+
+export default {
+  directives: {
+    tooltip,
+  },
+  components: {
+    Icon,
+    LoadingIcon,
+  },
+  props: {
+    issuableId: {
+      type: Number,
+      required: true,
+    },
+    issuableType: {
+      type: String,
+      required: true,
+    },
+    isTodo: {
+      type: Boolean,
+      required: false,
+      default: true,
+    },
+    isActionActive: {
+      type: Boolean,
+      required: false,
+      default: false,
+    },
+    collapsed: {
+      type: Boolean,
+      required: false,
+      default: false,
+    },
+  },
+  computed: {
+    buttonClasses() {
+      return this.collapsed ?
+        'btn-blank btn-todo sidebar-collapsed-icon dont-change-state' :
+        'btn btn-default btn-todo issuable-header-btn float-right';
+    },
+    buttonLabel() {
+      return this.isTodo ? MARK_TEXT : TODO_TEXT;
+    },
+    collapsedButtonIconClasses() {
+      return this.isTodo ? 'todo-undone' : '';
+    },
+    collapsedButtonIcon() {
+      return this.isTodo ? 'todo-done' : 'todo-add';
+    },
+  },
+  methods: {
+    handleButtonClick() {
+      this.$emit('toggleTodo');
+    },
+  },
+};
+</script>
+
+<template>
+  <button
+    v-tooltip
+    :class="buttonClasses"
+    :title="buttonLabel"
+    :aria-label="buttonLabel"
+    :data-issuable-id="issuableId"
+    :data-issuable-type="issuableType"
+    type="button"
+    data-container="body"
+    data-placement="left"
+    data-boundary="viewport"
+    @click="handleButtonClick"
+  >
+    <icon
+      v-show="collapsed"
+      :css-classes="collapsedButtonIconClasses"
+      :name="collapsedButtonIcon"
+    />
+    <span
+      v-show="!collapsed"
+      class="issuable-todo-inner"
+    >
+      {{ buttonLabel }}
+    </span>
+    <loading-icon
+      v-show="isActionActive"
+      :inline="true"
+    />
+  </button>
+</template>
diff --git a/app/assets/javascripts/vue_shared/components/sidebar/toggle_sidebar.vue b/app/assets/javascripts/vue_shared/components/sidebar/toggle_sidebar.vue
index ac2e99abe77..80dc7d3557c 100644
--- a/app/assets/javascripts/vue_shared/components/sidebar/toggle_sidebar.vue
+++ b/app/assets/javascripts/vue_shared/components/sidebar/toggle_sidebar.vue
@@ -12,6 +12,11 @@ export default {
       type: Boolean,
       required: true,
     },
+    cssClasses: {
+      type: String,
+      required: false,
+      default: '',
+    },
   },
   computed: {
     tooltipLabel() {
@@ -30,10 +35,12 @@ export default {
   <button
     v-tooltip
     :title="tooltipLabel"
+    :class="cssClasses"
     type="button"
     class="btn btn-blank gutter-toggle btn-sidebar-action"
     data-container="body"
     data-placement="left"
+    data-boundary="viewport"
     @click="toggle"
   >
     <i
diff --git a/app/assets/stylesheets/pages/issuable.scss b/app/assets/stylesheets/pages/issuable.scss
index d5ae2b673d9..8e78d9f65eb 100644
--- a/app/assets/stylesheets/pages/issuable.scss
+++ b/app/assets/stylesheets/pages/issuable.scss
@@ -449,6 +449,7 @@
 
       .todo-undone {
         color: $gl-link-color;
+        fill: $gl-link-color;
       }
 
       .author {
diff --git a/app/assets/stylesheets/pages/todos.scss b/app/assets/stylesheets/pages/todos.scss
index e5d7dd13915..010a2c05a1c 100644
--- a/app/assets/stylesheets/pages/todos.scss
+++ b/app/assets/stylesheets/pages/todos.scss
@@ -174,6 +174,18 @@
   }
 }
 
+@include media-breakpoint-down(lg) {
+  .todos-filters {
+    .filter-categories {
+      width: 75%;
+
+      .filter-item {
+        margin-bottom: 10px;
+      }
+    }
+  }
+}
+
 @include media-breakpoint-down(xs) {
   .todo {
     .avatar {
@@ -199,6 +211,10 @@
   }
 
   .todos-filters {
+    .filter-categories {
+      width: auto;
+    }
+
     .dropdown-menu-toggle {
       width: 100%;
     }
diff --git a/app/controllers/concerns/todos_actions.rb b/app/controllers/concerns/todos_actions.rb
new file mode 100644
index 00000000000..c0acdb3498d
--- /dev/null
+++ b/app/controllers/concerns/todos_actions.rb
@@ -0,0 +1,12 @@
+module TodosActions
+  extend ActiveSupport::Concern
+
+  def create
+    todo = TodoService.new.mark_todo(issuable, current_user)
+
+    render json: {
+      count: TodosFinder.new(current_user, state: :pending).execute.count,
+      delete_path: dashboard_todo_path(todo)
+    }
+  end
+end
diff --git a/app/controllers/dashboard/todos_controller.rb b/app/controllers/dashboard/todos_controller.rb
index f9e8fe624e8..bd7111e28bc 100644
--- a/app/controllers/dashboard/todos_controller.rb
+++ b/app/controllers/dashboard/todos_controller.rb
@@ -70,7 +70,7 @@ class Dashboard::TodosController < Dashboard::ApplicationController
   end
 
   def todo_params
-    params.permit(:action_id, :author_id, :project_id, :type, :sort, :state)
+    params.permit(:action_id, :author_id, :project_id, :type, :sort, :state, :group_id)
   end
 
   def redirect_out_of_range(todos)
diff --git a/app/controllers/projects/todos_controller.rb b/app/controllers/projects/todos_controller.rb
index a41fcb85c40..93fb9da6510 100644
--- a/app/controllers/projects/todos_controller.rb
+++ b/app/controllers/projects/todos_controller.rb
@@ -1,19 +1,13 @@
 class Projects::TodosController < Projects::ApplicationController
-  before_action :authenticate_user!, only: [:create]
-
-  def create
-    todo = TodoService.new.mark_todo(issuable, current_user)
+  include Gitlab::Utils::StrongMemoize
+  include TodosActions
 
-    render json: {
-      count: TodosFinder.new(current_user, state: :pending).execute.count,
-      delete_path: dashboard_todo_path(todo)
-    }
-  end
+  before_action :authenticate_user!, only: [:create]
 
   private
 
   def issuable
-    @issuable ||= begin
+    strong_memoize(:issuable) do
       case params[:issuable_type]
       when "issue"
         IssuesFinder.new(current_user, project_id: @project.id).find(params[:issuable_id])
diff --git a/app/finders/todos_finder.rb b/app/finders/todos_finder.rb
index 09e2c586f2a..2156413fb26 100644
--- a/app/finders/todos_finder.rb
+++ b/app/finders/todos_finder.rb
@@ -15,6 +15,7 @@
 class TodosFinder
   prepend FinderWithCrossProjectAccess
   include FinderMethods
+  include Gitlab::Utils::StrongMemoize
 
   requires_cross_project_access unless: -> { project? }
 
@@ -34,9 +35,11 @@ class TodosFinder
     items = by_author(items)
     items = by_state(items)
     items = by_type(items)
+    items = by_group(items)
     # Filtering by project HAS TO be the last because we use
     # the project IDs yielded by the todos query thus far
     items = by_project(items)
+    items = visible_to_user(items)
 
     sort(items)
   end
@@ -82,6 +85,10 @@ class TodosFinder
     params[:project_id].present?
   end
 
+  def group?
+    params[:group_id].present?
+  end
+
   def project
     return @project if defined?(@project)
 
@@ -100,18 +107,14 @@ class TodosFinder
     @project
   end
 
-  def project_ids(items)
-    ids = items.except(:order).select(:project_id)
-    if Gitlab::Database.mysql?
-      # To make UPDATE work on MySQL, wrap it in a SELECT with an alias
-      ids = Todo.except(:order).select('*').from("(#{ids.to_sql}) AS t")
+  def group
+    strong_memoize(:group) do
+      Group.find(params[:group_id])
     end
-
-    ids
   end
 
   def type?
-    type.present? && %w(Issue MergeRequest).include?(type)
+    type.present? && %w(Issue MergeRequest Epic).include?(type)
   end
 
   def type
@@ -148,12 +151,37 @@ class TodosFinder
 
   def by_project(items)
     if project?
-      items.where(project: project)
-    else
-      projects = Project.public_or_visible_to_user(current_user)
+      items = items.where(project: project)
+    end
+
+    items
+  end
 
-      items.joins(:project).merge(projects)
+  def by_group(items)
+    if group?
+      groups = group.self_and_descendants
+      items = items.where(
+        'project_id IN (?) OR group_id IN (?)',
+        Project.where(group: groups).select(:id),
+        groups.select(:id)
+      )
     end
+
+    items
+  end
+
+  def visible_to_user(items)
+    projects = Project.public_or_visible_to_user(current_user)
+    groups = Group.public_or_visible_to_user(current_user)
+
+    items
+      .joins('LEFT JOIN namespaces ON namespaces.id = todos.group_id')
+      .joins('LEFT JOIN projects ON projects.id = todos.project_id')
+      .where(
+        'project_id IN (?) OR group_id IN (?)',
+        projects.select(:id),
+        groups.select(:id)
+      )
   end
 
   def by_state(items)
diff --git a/app/helpers/issuables_helper.rb b/app/helpers/issuables_helper.rb
index 678fed9c414..c84ed8091c3 100644
--- a/app/helpers/issuables_helper.rb
+++ b/app/helpers/issuables_helper.rb
@@ -131,6 +131,19 @@ module IssuablesHelper
     end
   end
 
+  def group_dropdown_label(group_id, default_label)
+    return default_label if group_id.nil?
+    return "Any group" if group_id == "0"
+
+    group = ::Group.find_by(id: group_id)
+
+    if group
+      group.full_name
+    else
+      default_label
+    end
+  end
+
   def milestone_dropdown_label(milestone_title, default_label = "Milestone")
     title =
       case milestone_title
diff --git a/app/helpers/todos_helper.rb b/app/helpers/todos_helper.rb
index f7620e0b6b8..7cd74358168 100644
--- a/app/helpers/todos_helper.rb
+++ b/app/helpers/todos_helper.rb
@@ -43,7 +43,7 @@ module TodosHelper
       project_commit_path(todo.project,
                                     todo.target, anchor: anchor)
     else
-      path = [todo.project.namespace.becomes(Namespace), todo.project, todo.target]
+      path = [todo.parent, todo.target]
 
       path.unshift(:pipelines) if todo.build_failed?
 
@@ -167,4 +167,12 @@ module TodosHelper
   def show_todo_state?(todo)
     (todo.target.is_a?(MergeRequest) || todo.target.is_a?(Issue)) && %w(closed merged).include?(todo.target.state)
   end
+
+  def todo_group_options
+    groups = current_user.authorized_groups.map do |group|
+      { id: group.id, text: group.full_name }
+    end
+
+    groups.unshift({ id: '', text: 'Any Group' }).to_json
+  end
 end
diff --git a/app/models/concerns/issuable.rb b/app/models/concerns/issuable.rb
index b93c1145f82..7a459078151 100644
--- a/app/models/concerns/issuable.rb
+++ b/app/models/concerns/issuable.rb
@@ -243,6 +243,12 @@ module Issuable
     opened?
   end
 
+  def overdue?
+    return false unless respond_to?(:due_date)
+
+    due_date.try(:past?) || false
+  end
+
   def user_notes_count
     if notes.loaded?
       # Use the in-memory association to select and count to avoid hitting the db
diff --git a/app/models/group.rb b/app/models/group.rb
index ddebaff50b0..28677320e28 100644
--- a/app/models/group.rb
+++ b/app/models/group.rb
@@ -39,6 +39,8 @@ class Group < Namespace
   has_many :boards
   has_many :badges, class_name: 'GroupBadge'
 
+  has_many :todos
+
   accepts_nested_attributes_for :variables, allow_destroy: true
 
   validate :visibility_level_allowed_by_projects
@@ -82,6 +84,12 @@ class Group < Namespace
       where(id: user.authorized_groups.select(:id).reorder(nil))
     end
 
+    def public_or_visible_to_user(user)
+      where('id IN (?) OR namespaces.visibility_level IN (?)',
+        user.authorized_groups.select(:id),
+        Gitlab::VisibilityLevel.levels_for_user(user))
+    end
+
     def select_for_project_authorization
       if current_scope.joins_values.include?(:shared_projects)
         joins('INNER JOIN namespaces project_namespace ON project_namespace.id = projects.namespace_id')
diff --git a/app/models/issue.rb b/app/models/issue.rb
index e4ed06f9a69..b5e6a93b870 100644
--- a/app/models/issue.rb
+++ b/app/models/issue.rb
@@ -276,10 +276,6 @@ class Issue < ActiveRecord::Base
     user ? readable_by?(user) : publicly_visible?
   end
 
-  def overdue?
-    due_date.try(:past?) || false
-  end
-
   def check_for_spam?
     project.public? && (title_changed? || description_changed?)
   end
diff --git a/app/models/note.rb b/app/models/note.rb
index 87cf7c7b2fa..5c60e6d7489 100644
--- a/app/models/note.rb
+++ b/app/models/note.rb
@@ -229,6 +229,10 @@ class Note < ActiveRecord::Base
     !for_personal_snippet?
   end
 
+  def for_issuable?
+    for_issue? || for_merge_request?
+  end
+
   def skip_project_check?
     !for_project_noteable?
   end
diff --git a/app/models/todo.rb b/app/models/todo.rb
index a2ab405fdbe..942cbb754e3 100644
--- a/app/models/todo.rb
+++ b/app/models/todo.rb
@@ -22,15 +22,18 @@ class Todo < ActiveRecord::Base
   belongs_to :author, class_name: "User"
   belongs_to :note
   belongs_to :project
+  belongs_to :group
   belongs_to :target, polymorphic: true, touch: true # rubocop:disable Cop/PolymorphicAssociations
   belongs_to :user
 
   delegate :name, :email, to: :author, prefix: true, allow_nil: true
 
-  validates :action, :project, :target_type, :user, presence: true
+  validates :action, :target_type, :user, presence: true
   validates :author, presence: true
   validates :target_id, presence: true, unless: :for_commit?
   validates :commit_id, presence: true, if: :for_commit?
+  validates :project, presence: true, unless: :group_id
+  validates :group, presence: true, unless: :project_id
 
   scope :pending, -> { with_state(:pending) }
   scope :done, -> { with_state(:done) }
@@ -44,7 +47,7 @@ class Todo < ActiveRecord::Base
     state :done
   end
 
-  after_save :keep_around_commit
+  after_save :keep_around_commit, if: :commit_id
 
   class << self
     # Priority sorting isn't displayed in the dropdown, because we don't show
@@ -79,6 +82,10 @@ class Todo < ActiveRecord::Base
     end
   end
 
+  def parent
+    project
+  end
+
   def unmergeable?
     action == UNMERGEABLE
   end
diff --git a/app/services/todo_service.rb b/app/services/todo_service.rb
index 0bcd53c76a9..0df61ad3bce 100644
--- a/app/services/todo_service.rb
+++ b/app/services/todo_service.rb
@@ -262,15 +262,15 @@ class TodoService
     end
   end
 
-  def create_mention_todos(project, target, author, note = nil, skip_users = [])
+  def create_mention_todos(parent, target, author, note = nil, skip_users = [])
     # Create Todos for directly addressed users
-    directly_addressed_users = filter_directly_addressed_users(project, note || target, author, skip_users)
-    attributes = attributes_for_todo(project, target, author, Todo::DIRECTLY_ADDRESSED, note)
+    directly_addressed_users = filter_directly_addressed_users(parent, note || target, author, skip_users)
+    attributes = attributes_for_todo(parent, target, author, Todo::DIRECTLY_ADDRESSED, note)
     create_todos(directly_addressed_users, attributes)
 
     # Create Todos for mentioned users
-    mentioned_users = filter_mentioned_users(project, note || target, author, skip_users)
-    attributes = attributes_for_todo(project, target, author, Todo::MENTIONED, note)
+    mentioned_users = filter_mentioned_users(parent, note || target, author, skip_users)
+    attributes = attributes_for_todo(parent, target, author, Todo::MENTIONED, note)
     create_todos(mentioned_users, attributes)
   end
 
@@ -301,36 +301,36 @@ class TodoService
 
   def attributes_for_todo(project, target, author, action, note = nil)
     attributes_for_target(target).merge!(
-      project_id: project.id,
+      project_id: project&.id,
       author_id: author.id,
       action: action,
       note: note
     )
   end
 
-  def filter_todo_users(users, project, target)
-    reject_users_without_access(users, project, target).uniq
+  def filter_todo_users(users, parent, target)
+    reject_users_without_access(users, parent, target).uniq
   end
 
-  def filter_mentioned_users(project, target, author, skip_users = [])
+  def filter_mentioned_users(parent, target, author, skip_users = [])
     mentioned_users = target.mentioned_users(author) - skip_users
-    filter_todo_users(mentioned_users, project, target)
+    filter_todo_users(mentioned_users, parent, target)
   end
 
-  def filter_directly_addressed_users(project, target, author, skip_users = [])
+  def filter_directly_addressed_users(parent, target, author, skip_users = [])
     directly_addressed_users = target.directly_addressed_users(author) - skip_users
-    filter_todo_users(directly_addressed_users, project, target)
+    filter_todo_users(directly_addressed_users, parent, target)
   end
 
-  def reject_users_without_access(users, project, target)
-    if target.is_a?(Note) && (target.for_issue? || target.for_merge_request?)
+  def reject_users_without_access(users, parent, target)
+    if target.is_a?(Note) && target.for_issuable?
       target = target.noteable
     end
 
     if target.is_a?(Issuable)
       select_users(users, :"read_#{target.to_ability_name}", target)
     else
-      select_users(users, :read_project, project)
+      select_users(users, :read_project, parent)
     end
   end
 
diff --git a/app/views/dashboard/todos/index.html.haml b/app/views/dashboard/todos/index.html.haml
index d5a9cc646a6..8b3974d97f8 100644
--- a/app/views/dashboard/todos/index.html.haml
+++ b/app/views/dashboard/todos/index.html.haml
@@ -30,27 +30,33 @@
 
   .todos-filters
     .row-content-block.second-block
-      = form_tag todos_filter_path(without: [:project_id, :author_id, :type, :action_id]), method: :get, class: 'filter-form' do
-        .filter-item.inline
-          - if params[:project_id].present?
-            = hidden_field_tag(:project_id, params[:project_id])
-          = dropdown_tag(project_dropdown_label(params[:project_id], 'Project'), options: { toggle_class: 'js-project-search js-filter-submit', title: 'Filter by project', filter: true, filterInput: 'input#project-search', dropdown_class: 'dropdown-menu-selectable dropdown-menu-project js-filter-submit',
-            placeholder: 'Search projects', data: { data: todo_projects_options, default_label: 'Project', display: 'static' } })
-        .filter-item.inline
-          - if params[:author_id].present?
-            = hidden_field_tag(:author_id, params[:author_id])
-          = dropdown_tag(user_dropdown_label(params[:author_id], 'Author'), options: { toggle_class: 'js-user-search js-filter-submit js-author-search', title: 'Filter by author', filter: true, filterInput: 'input#author-search', dropdown_class: 'dropdown-menu-user dropdown-menu-selectable dropdown-menu-author js-filter-submit',
-            placeholder: 'Search authors', data: { any_user: 'Any Author', first_user: (current_user.username if current_user), project_id: (@project.id if @project), selected: params[:author_id], field_name: 'author_id', default_label: 'Author', todo_filter: true, todo_state_filter: params[:state] || 'pending' } })
-        .filter-item.inline
-          - if params[:type].present?
-            = hidden_field_tag(:type, params[:type])
-          = dropdown_tag(todo_types_dropdown_label(params[:type], 'Type'), options: { toggle_class: 'js-type-search js-filter-submit', dropdown_class: 'dropdown-menu-selectable dropdown-menu-type js-filter-submit',
-            data: { data: todo_types_options, default_label: 'Type' } })
-        .filter-item.inline.actions-filter
-          - if params[:action_id].present?
-            = hidden_field_tag(:action_id, params[:action_id])
-          = dropdown_tag(todo_actions_dropdown_label(params[:action_id], 'Action'), options: { toggle_class: 'js-action-search js-filter-submit', dropdown_class: 'dropdown-menu-selectable dropdown-menu-action js-filter-submit',
-            data: { data: todo_actions_options, default_label: 'Action' } })
+      = form_tag todos_filter_path(without: [:project_id, :author_id, :type, :action_id]), method: :get, class: 'filter-form d-sm-flex' do
+        .filter-categories.flex-fill
+          .filter-item.inline
+            - if params[:group_id].present?
+              = hidden_field_tag(:group_id, params[:group_id])
+            = dropdown_tag(group_dropdown_label(params[:group_id], 'Group'), options: { toggle_class: 'js-group-search js-filter-submit', title: 'Filter by group', filter: true, filterInput: 'input#group-search', dropdown_class: 'dropdown-menu-selectable dropdown-menu-group js-filter-submit',
+              placeholder: 'Search groups', data: { data: todo_group_options, default_label: 'Group', display: 'static' } })
+          .filter-item.inline
+            - if params[:project_id].present?
+              = hidden_field_tag(:project_id, params[:project_id])
+            = dropdown_tag(project_dropdown_label(params[:project_id], 'Project'), options: { toggle_class: 'js-project-search js-filter-submit', title: 'Filter by project', filter: true, filterInput: 'input#project-search', dropdown_class: 'dropdown-menu-selectable dropdown-menu-project js-filter-submit',
+              placeholder: 'Search projects', data: { data: todo_projects_options, default_label: 'Project', display: 'static' } })
+          .filter-item.inline
+            - if params[:author_id].present?
+              = hidden_field_tag(:author_id, params[:author_id])
+            = dropdown_tag(user_dropdown_label(params[:author_id], 'Author'), options: { toggle_class: 'js-user-search js-filter-submit js-author-search', title: 'Filter by author', filter: true, filterInput: 'input#author-search', dropdown_class: 'dropdown-menu-user dropdown-menu-selectable dropdown-menu-author js-filter-submit',
+              placeholder: 'Search authors', data: { any_user: 'Any Author', first_user: (current_user.username if current_user), project_id: (@project.id if @project), selected: params[:author_id], field_name: 'author_id', default_label: 'Author', todo_filter: true, todo_state_filter: params[:state] || 'pending' } })
+          .filter-item.inline
+            - if params[:type].present?
+              = hidden_field_tag(:type, params[:type])
+            = dropdown_tag(todo_types_dropdown_label(params[:type], 'Type'), options: { toggle_class: 'js-type-search js-filter-submit', dropdown_class: 'dropdown-menu-selectable dropdown-menu-type js-filter-submit',
+              data: { data: todo_types_options, default_label: 'Type' } })
+          .filter-item.inline.actions-filter
+            - if params[:action_id].present?
+              = hidden_field_tag(:action_id, params[:action_id])
+            = dropdown_tag(todo_actions_dropdown_label(params[:action_id], 'Action'), options: { toggle_class: 'js-action-search js-filter-submit', dropdown_class: 'dropdown-menu-selectable dropdown-menu-action js-filter-submit',
+              data: { data: todo_actions_options, default_label: 'Action' } })
         .filter-item.sort-filter
           .dropdown
             %button.dropdown-menu-toggle.dropdown-menu-toggle-sort{ type: 'button', 'data-toggle' => 'dropdown' }
diff --git a/db/migrate/20180608091413_add_group_to_todos.rb b/db/migrate/20180608091413_add_group_to_todos.rb
new file mode 100644
index 00000000000..af3ee48b29d
--- /dev/null
+++ b/db/migrate/20180608091413_add_group_to_todos.rb
@@ -0,0 +1,32 @@
+class AddGroupToTodos < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    add_column :todos, :group_id, :integer
+    add_concurrent_foreign_key :todos, :namespaces, column: :group_id, on_delete: :cascade
+    add_concurrent_index :todos, :group_id
+
+    change_column_null :todos, :project_id, true
+  end
+
+  def down
+    return unless group_id_exists?
+
+    remove_foreign_key :todos, column: :group_id
+    remove_index :todos, :group_id if index_exists?(:todos, :group_id)
+    remove_column :todos, :group_id
+
+    execute "DELETE FROM todos WHERE project_id IS NULL"
+    change_column_null :todos, :project_id, false
+  end
+
+  private
+
+  def group_id_exists?
+    column_exists?(:todos, :group_id)
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 769baa825a5..56b81adc72f 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -1988,7 +1988,7 @@ ActiveRecord::Schema.define(version: 20180726172057) do
 
   create_table "todos", force: :cascade do |t|
     t.integer "user_id", null: false
-    t.integer "project_id", null: false
+    t.integer "project_id"
     t.integer "target_id"
     t.string "target_type", null: false
     t.integer "author_id", null: false
@@ -1998,10 +1998,12 @@ ActiveRecord::Schema.define(version: 20180726172057) do
     t.datetime "updated_at"
     t.integer "note_id"
     t.string "commit_id"
+    t.integer "group_id"
   end
 
   add_index "todos", ["author_id"], name: "index_todos_on_author_id", using: :btree
   add_index "todos", ["commit_id"], name: "index_todos_on_commit_id", using: :btree
+  add_index "todos", ["group_id"], name: "index_todos_on_group_id", using: :btree
   add_index "todos", ["note_id"], name: "index_todos_on_note_id", using: :btree
   add_index "todos", ["project_id"], name: "index_todos_on_project_id", using: :btree
   add_index "todos", ["target_type", "target_id"], name: "index_todos_on_target_type_and_target_id", using: :btree
@@ -2388,6 +2390,7 @@ ActiveRecord::Schema.define(version: 20180726172057) do
   add_foreign_key "term_agreements", "users", on_delete: :cascade
   add_foreign_key "timelogs", "issues", name: "fk_timelogs_issues_issue_id", on_delete: :cascade
   add_foreign_key "timelogs", "merge_requests", name: "fk_timelogs_merge_requests_merge_request_id", on_delete: :cascade
+  add_foreign_key "todos", "namespaces", column: "group_id", on_delete: :cascade
   add_foreign_key "todos", "notes", name: "fk_91d1f47b13", on_delete: :cascade
   add_foreign_key "todos", "projects", name: "fk_45054f9c45", on_delete: :cascade
   add_foreign_key "todos", "users", column: "author_id", name: "fk_ccf0373936", on_delete: :cascade
diff --git a/doc/api/todos.md b/doc/api/todos.md
index 27e623007cc..0843e4eedc6 100644
--- a/doc/api/todos.md
+++ b/doc/api/todos.md
@@ -18,6 +18,7 @@ Parameters:
 | `action` | string | no | The action to be filtered. Can be `assigned`, `mentioned`, `build_failed`, `marked`, `approval_required`, `unmergeable` or `directly_addressed`. |
 | `author_id` | integer | no | The ID of an author |
 | `project_id` | integer | no | The ID of a project |
+| `group_id` | integer | no | The ID of a group |
 | `state` | string | no | The state of the todo. Can be either `pending` or `done` |
 | `type` | string | no | The type of a todo. Can be either `Issue` or `MergeRequest` |
 
diff --git a/doc/workflow/todos.md b/doc/workflow/todos.md
index 760cd87d4cc..dda82352c67 100644
--- a/doc/workflow/todos.md
+++ b/doc/workflow/todos.md
@@ -109,6 +109,7 @@ There are four kinds of filters you can use on your Todos dashboard.
 | Filter  | Description |
 | ------- | ----------- |
 | Project | Filter by project |
+| Group   | Filter by group |
 | Author  | Filter by the author that triggered the Todo |
 | Type    | Filter by issue or merge request |
 | Action  | Filter by the action that triggered the Todo |
diff --git a/lib/api/entities.rb b/lib/api/entities.rb
index f858d9fa23d..27f28e1df93 100644
--- a/lib/api/entities.rb
+++ b/lib/api/entities.rb
@@ -795,28 +795,33 @@ module API
 
     class Todo < Grape::Entity
       expose :id
-      expose :project, using: Entities::BasicProjectDetails
+      expose :project, using: Entities::ProjectIdentity, if: -> (todo, _) { todo.project_id }
+      expose :group, using: 'API::Entities::NamespaceBasic', if: -> (todo, _) { todo.group_id }
       expose :author, using: Entities::UserBasic
       expose :action_name
       expose :target_type
 
       expose :target do |todo, options|
-        Entities.const_get(todo.target_type).represent(todo.target, options)
+        todo_target_class(todo.target_type).represent(todo.target, options)
       end
 
       expose :target_url do |todo, options|
         target_type   = todo.target_type.underscore
-        target_url    = "namespace_project_#{target_type}_url"
+        target_url    = "#{todo.parent.class.to_s.underscore}_#{target_type}_url"
         target_anchor = "note_#{todo.note_id}" if todo.note_id?
 
         Gitlab::Routing
           .url_helpers
-          .public_send(target_url, todo.project.namespace, todo.project, todo.target, anchor: target_anchor) # rubocop:disable GitlabSecurity/PublicSend
+          .public_send(target_url, todo.parent, todo.target, anchor: target_anchor) # rubocop:disable GitlabSecurity/PublicSend
       end
 
       expose :body
       expose :state
       expose :created_at
+
+      def todo_target_class(target_type)
+        ::API::Entities.const_get(target_type)
+      end
     end
 
     class NamespaceBasic < Grape::Entity
diff --git a/spec/controllers/projects/todos_controller_spec.rb b/spec/controllers/projects/todos_controller_spec.rb
index 1ce7e84bef9..58f2817c7cc 100644
--- a/spec/controllers/projects/todos_controller_spec.rb
+++ b/spec/controllers/projects/todos_controller_spec.rb
@@ -5,10 +5,29 @@ describe Projects::TodosController do
   let(:project)       { create(:project) }
   let(:issue)         { create(:issue, project: project) }
   let(:merge_request) { create(:merge_request, source_project: project) }
+  let(:parent)        { project }
+
+  shared_examples 'project todos actions' do
+    it_behaves_like 'todos actions'
+
+    context 'when not authorized for resource' do
+      before do
+        project.update!(visibility_level: Gitlab::VisibilityLevel::PUBLIC)
+        project.project_feature.update!(issues_access_level: ProjectFeature::PRIVATE)
+        project.project_feature.update!(merge_requests_access_level: ProjectFeature::PRIVATE)
+        sign_in(user)
+      end
+
+      it "doesn't create todo" do
+        expect { post_create }.not_to change { user.todos.count }
+        expect(response).to have_gitlab_http_status(404)
+      end
+    end
+  end
 
   context 'Issues' do
     describe 'POST create' do
-      def go
+      def post_create
         post :create,
           namespace_id: project.namespace,
           project_id: project,
@@ -17,66 +36,13 @@ describe Projects::TodosController do
           format: 'html'
       end
 
-      context 'when authorized' do
-        before do
-          sign_in(user)
-          project.add_developer(user)
-        end
-
-        it 'creates todo for issue' do
-          expect do
-            go
-          end.to change { user.todos.count }.by(1)
-
-          expect(response).to have_gitlab_http_status(200)
-        end
-
-        it 'returns todo path and pending count' do
-          go
-
-          expect(response).to have_gitlab_http_status(200)
-          expect(json_response['count']).to eq 1
-          expect(json_response['delete_path']).to match(%r{/dashboard/todos/\d{1}})
-        end
-      end
-
-      context 'when not authorized for project' do
-        it 'does not create todo for issue that user has no access to' do
-          sign_in(user)
-          expect do
-            go
-          end.to change { user.todos.count }.by(0)
-
-          expect(response).to have_gitlab_http_status(404)
-        end
-
-        it 'does not create todo for issue when user not logged in' do
-          expect do
-            go
-          end.to change { user.todos.count }.by(0)
-
-          expect(response).to have_gitlab_http_status(302)
-        end
-      end
-
-      context 'when not authorized for issue' do
-        before do
-          project.update!(visibility_level: Gitlab::VisibilityLevel::PUBLIC)
-          project.project_feature.update!(issues_access_level: ProjectFeature::PRIVATE)
-          sign_in(user)
-        end
-
-        it "doesn't create todo" do
-          expect { go }.not_to change { user.todos.count }
-          expect(response).to have_gitlab_http_status(404)
-        end
-      end
+      it_behaves_like 'project todos actions'
     end
   end
 
   context 'Merge Requests' do
     describe 'POST create' do
-      def go
+      def post_create
         post :create,
           namespace_id: project.namespace,
           project_id: project,
@@ -85,60 +51,7 @@ describe Projects::TodosController do
           format: 'html'
       end
 
-      context 'when authorized' do
-        before do
-          sign_in(user)
-          project.add_developer(user)
-        end
-
-        it 'creates todo for merge request' do
-          expect do
-            go
-          end.to change { user.todos.count }.by(1)
-
-          expect(response).to have_gitlab_http_status(200)
-        end
-
-        it 'returns todo path and pending count' do
-          go
-
-          expect(response).to have_gitlab_http_status(200)
-          expect(json_response['count']).to eq 1
-          expect(json_response['delete_path']).to match(%r{/dashboard/todos/\d{1}})
-        end
-      end
-
-      context 'when not authorized for project' do
-        it 'does not create todo for merge request user has no access to' do
-          sign_in(user)
-          expect do
-            go
-          end.to change { user.todos.count }.by(0)
-
-          expect(response).to have_gitlab_http_status(404)
-        end
-
-        it 'does not create todo for merge request user has no access to' do
-          expect do
-            go
-          end.to change { user.todos.count }.by(0)
-
-          expect(response).to have_gitlab_http_status(302)
-        end
-      end
-
-      context 'when not authorized for merge_request' do
-        before do
-          project.update!(visibility_level: Gitlab::VisibilityLevel::PUBLIC)
-          project.project_feature.update!(merge_requests_access_level: ProjectFeature::PRIVATE)
-          sign_in(user)
-        end
-
-        it "doesn't create todo" do
-          expect { go }.not_to change { user.todos.count }
-          expect(response).to have_gitlab_http_status(404)
-        end
-      end
+      it_behaves_like 'project todos actions'
     end
   end
 end
diff --git a/spec/factories/todos.rb b/spec/factories/todos.rb
index 94f8caedfa6..14486c80341 100644
--- a/spec/factories/todos.rb
+++ b/spec/factories/todos.rb
@@ -1,8 +1,8 @@
 FactoryBot.define do
   factory :todo do
     project
-    author { project.creator }
-    user { project.creator }
+    author { project&.creator || user }
+    user { project&.creator || user }
     target factory: :issue
     action { Todo::ASSIGNED }
 
diff --git a/spec/finders/todos_finder_spec.rb b/spec/finders/todos_finder_spec.rb
index 9747b9402a7..6061021d3b0 100644
--- a/spec/finders/todos_finder_spec.rb
+++ b/spec/finders/todos_finder_spec.rb
@@ -5,12 +5,76 @@ describe TodosFinder do
     let(:user) { create(:user) }
     let(:group) { create(:group) }
     let(:project) { create(:project, namespace: group) }
+    let(:issue) { create(:issue, project: project) }
+    let(:merge_request) { create(:merge_request, source_project: project) }
     let(:finder) { described_class }
 
     before do
       group.add_developer(user)
     end
 
+    describe '#execute' do
+      context 'visibility' do
+        let(:private_group_access) { create(:group, :private) }
+        let(:private_group_hidden) { create(:group, :private) }
+        let(:public_project) { create(:project, :public) }
+        let(:private_project_hidden) { create(:project) }
+        let(:public_group) { create(:group) }
+
+        let!(:todo1) { create(:todo, user: user, project: project, group: nil) }
+        let!(:todo2) { create(:todo, user: user, project: public_project, group: nil) }
+        let!(:todo3) { create(:todo, user: user, project: private_project_hidden, group: nil) }
+        let!(:todo4) { create(:todo, user: user, project: nil, group: group) }
+        let!(:todo5) { create(:todo, user: user, project: nil, group: private_group_access) }
+        let!(:todo6) { create(:todo, user: user, project: nil, group: private_group_hidden) }
+        let!(:todo7) { create(:todo, user: user, project: nil, group: public_group) }
+
+        before do
+          private_group_access.add_developer(user)
+        end
+
+        it 'returns only todos with a target a user has access to' do
+          todos = finder.new(user).execute
+
+          expect(todos).to match_array([todo1, todo2, todo4, todo5, todo7])
+        end
+      end
+
+      context 'filtering' do
+        let!(:todo1) { create(:todo, user: user, project: project, target: issue) }
+        let!(:todo2) { create(:todo, user: user, group: group, target: merge_request) }
+
+        it 'returns correct todos when filtered by a project' do
+          todos = finder.new(user, { project_id: project.id }).execute
+
+          expect(todos).to match_array([todo1])
+        end
+
+        it 'returns correct todos when filtered by a group' do
+          todos = finder.new(user, { group_id: group.id }).execute
+
+          expect(todos).to match_array([todo1, todo2])
+        end
+
+        it 'returns correct todos when filtered by a type' do
+          todos = finder.new(user, { type: 'Issue' }).execute
+
+          expect(todos).to match_array([todo1])
+        end
+
+        context 'with subgroups', :nested_groups do
+          let(:subgroup) { create(:group, parent: group) }
+          let!(:todo3) { create(:todo, user: user, group: subgroup, target: issue) }
+
+          it 'returns todos from subgroups when filtered by a group' do
+            todos = finder.new(user, { group_id: group.id }).execute
+
+            expect(todos).to match_array([todo1, todo2, todo3])
+          end
+        end
+      end
+    end
+
     describe '#sort' do
       context 'by date' do
         let!(:todo1) { create(:todo, user: user, project: project) }
diff --git a/spec/helpers/issuables_helper_spec.rb b/spec/helpers/issuables_helper_spec.rb
index 77410e0070c..f76ed4bfda4 100644
--- a/spec/helpers/issuables_helper_spec.rb
+++ b/spec/helpers/issuables_helper_spec.rb
@@ -21,6 +21,27 @@ describe IssuablesHelper do
     end
   end
 
+  describe '#group_dropdown_label' do
+    let(:group)  { create(:group) }
+    let(:default) { 'default label' }
+
+    it 'returns default group label when group_id is nil' do
+      expect(group_dropdown_label(nil, default)).to eq('default label')
+    end
+
+    it 'returns "any group" when group_id is 0' do
+      expect(group_dropdown_label('0', default)).to eq('Any group')
+    end
+
+    it 'returns group full path when a group was found for the provided id' do
+      expect(group_dropdown_label(group.id, default)).to eq(group.full_name)
+    end
+
+    it 'returns default label when a group was not found for the provided id' do
+      expect(group_dropdown_label(9999, default)).to eq('default label')
+    end
+  end
+
   describe '#issuable_labels_tooltip' do
     it 'returns label text with no labels' do
       expect(issuable_labels_tooltip([])).to eq("Labels")
diff --git a/spec/javascripts/sidebar/todo_spec.js b/spec/javascripts/sidebar/todo_spec.js
new file mode 100644
index 00000000000..a929b804a29
--- /dev/null
+++ b/spec/javascripts/sidebar/todo_spec.js
@@ -0,0 +1,158 @@
+import Vue from 'vue';
+
+import SidebarTodos from '~/sidebar/components/todo_toggle/todo.vue';
+import mountComponent from 'spec/helpers/vue_mount_component_helper';
+
+const createComponent = ({
+  issuableId = 1,
+  issuableType = 'epic',
+  isTodo,
+  isActionActive,
+  collapsed,
+}) => {
+  const Component = Vue.extend(SidebarTodos);
+
+  return mountComponent(Component, {
+    issuableId,
+    issuableType,
+    isTodo,
+    isActionActive,
+    collapsed,
+  });
+};
+
+describe('SidebarTodo', () => {
+  let vm;
+
+  beforeEach(() => {
+    vm = createComponent({});
+  });
+
+  afterEach(() => {
+    vm.$destroy();
+  });
+
+  describe('computed', () => {
+    describe('buttonClasses', () => {
+      it('returns todo button classes for when `collapsed` prop is `false`', () => {
+        expect(vm.buttonClasses).toBe('btn btn-default btn-todo issuable-header-btn float-right');
+      });
+
+      it('returns todo button classes for when `collapsed` prop is `true`', done => {
+        vm.collapsed = true;
+        Vue.nextTick()
+          .then(() => {
+            expect(vm.buttonClasses).toBe('btn-blank btn-todo sidebar-collapsed-icon dont-change-state');
+          })
+          .then(done)
+          .catch(done.fail);
+      });
+    });
+
+    describe('buttonLabel', () => {
+      it('returns todo button text for marking todo as done when `isTodo` prop is `true`', () => {
+        expect(vm.buttonLabel).toBe('Mark todo as done');
+      });
+
+      it('returns todo button text for add todo when `isTodo` prop is `false`', done => {
+        vm.isTodo = false;
+        Vue.nextTick()
+          .then(() => {
+            expect(vm.buttonLabel).toBe('Add todo');
+          })
+          .then(done)
+          .catch(done.fail);
+      });
+    });
+
+    describe('collapsedButtonIconClasses', () => {
+      it('returns collapsed button icon class when `isTodo` prop is `true`', () => {
+        expect(vm.collapsedButtonIconClasses).toBe('todo-undone');
+      });
+
+      it('returns empty string when `isTodo` prop is `false`', done => {
+        vm.isTodo = false;
+        Vue.nextTick()
+          .then(() => {
+            expect(vm.collapsedButtonIconClasses).toBe('');
+          })
+          .then(done)
+          .catch(done.fail);
+      });
+    });
+
+    describe('collapsedButtonIcon', () => {
+      it('returns button icon name when `isTodo` prop is `true`', () => {
+        expect(vm.collapsedButtonIcon).toBe('todo-done');
+      });
+
+      it('returns button icon name when `isTodo` prop is `false`', done => {
+        vm.isTodo = false;
+        Vue.nextTick()
+          .then(() => {
+            expect(vm.collapsedButtonIcon).toBe('todo-add');
+          })
+          .then(done)
+          .catch(done.fail);
+      });
+    });
+  });
+
+  describe('methods', () => {
+    describe('handleButtonClick', () => {
+      it('emits `toggleTodo` event on component', () => {
+        spyOn(vm, '$emit');
+        vm.handleButtonClick();
+        expect(vm.$emit).toHaveBeenCalledWith('toggleTodo');
+      });
+    });
+  });
+
+  describe('template', () => {
+    it('renders component container element', () => {
+      const dataAttributes = {
+        issuableId: '1',
+        issuableType: 'epic',
+        originalTitle: 'Mark todo as done',
+        placement: 'left',
+        container: 'body',
+        boundary: 'viewport',
+      };
+      expect(vm.$el.nodeName).toBe('BUTTON');
+
+      const elDataAttrs = vm.$el.dataset;
+      Object.keys(elDataAttrs).forEach((attr) => {
+        expect(elDataAttrs[attr]).toBe(dataAttributes[attr]);
+      });
+    });
+
+    it('renders button label element when `collapsed` prop is `false`', () => {
+      const buttonLabelEl = vm.$el.querySelector('span.issuable-todo-inner');
+      expect(buttonLabelEl).not.toBeNull();
+      expect(buttonLabelEl.innerText.trim()).toBe('Mark todo as done');
+    });
+
+    it('renders button icon when `collapsed` prop is `true`', done => {
+      vm.collapsed = true;
+      Vue.nextTick()
+        .then(() => {
+          const buttonIconEl = vm.$el.querySelector('svg');
+          expect(buttonIconEl).not.toBeNull();
+          expect(buttonIconEl.querySelector('use').getAttribute('xlink:href')).toContain('todo-done');
+        })
+        .then(done)
+        .catch(done.fail);
+    });
+
+    it('renders loading icon when `isActionActive` prop is true', done => {
+      vm.isActionActive = true;
+      Vue.nextTick()
+        .then(() => {
+          const loadingEl = vm.$el.querySelector('span.loading-container');
+          expect(loadingEl).not.toBeNull();
+        })
+        .then(done)
+        .catch(done.fail);
+    });
+  });
+});
diff --git a/spec/models/todo_spec.rb b/spec/models/todo_spec.rb
index bd498269798..f29abcf536e 100644
--- a/spec/models/todo_spec.rb
+++ b/spec/models/todo_spec.rb
@@ -7,6 +7,7 @@ describe Todo do
     it { is_expected.to belong_to(:author).class_name("User") }
     it { is_expected.to belong_to(:note) }
     it { is_expected.to belong_to(:project) }
+    it { is_expected.to belong_to(:group) }
     it { is_expected.to belong_to(:target).touch(true) }
     it { is_expected.to belong_to(:user) }
   end
diff --git a/spec/support/shared_examples/controllers/todos_shared_examples.rb b/spec/support/shared_examples/controllers/todos_shared_examples.rb
new file mode 100644
index 00000000000..bafd9bac8d0
--- /dev/null
+++ b/spec/support/shared_examples/controllers/todos_shared_examples.rb
@@ -0,0 +1,43 @@
+shared_examples 'todos actions' do
+  context 'when authorized' do
+    before do
+      sign_in(user)
+      parent.add_developer(user)
+    end
+
+    it 'creates todo' do
+      expect do
+        post_create
+      end.to change { user.todos.count }.by(1)
+
+      expect(response).to have_gitlab_http_status(200)
+    end
+
+    it 'returns todo path and pending count' do
+      post_create
+
+      expect(response).to have_gitlab_http_status(200)
+      expect(json_response['count']).to eq 1
+      expect(json_response['delete_path']).to match(%r{/dashboard/todos/\d{1}})
+    end
+  end
+
+  context 'when not authorized for project/group' do
+    it 'does not create todo for resource that user has no access to' do
+      sign_in(user)
+      expect do
+        post_create
+      end.to change { user.todos.count }.by(0)
+
+      expect(response).to have_gitlab_http_status(404)
+    end
+
+    it 'does not create todo when user is not logged in' do
+      expect do
+        post_create
+      end.to change { user.todos.count }.by(0)
+
+      expect(response).to have_gitlab_http_status(parent.is_a?(Group) ? 401 : 302)
+    end
+  end
+end
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