Adds milestone search

Adds to search ILIKE search for milestones title in:
  - Milestones dashboard
  - Group milestones page
  - Project milestones page

21 files changed, 144 insertions, 13 deletions

diff --git a/app/controllers/dashboard/milestones_controller.rb b/app/controllers/dashboard/milestones_controller.rb
index 3802aa5f40f..9484e4d30cd 100644
--- a/app/controllers/dashboard/milestones_controller.rb
+++ b/app/controllers/dashboard/milestones_controller.rb
@@ -27,7 +27,7 @@ class Dashboard::MilestonesController < Dashboard::ApplicationController
   def group_milestones
     groups = GroupsFinder.new(current_user, all_available: false).execute
 
-    DashboardGroupMilestone.build_collection(groups)
+    DashboardGroupMilestone.build_collection(groups, params)
   end
 
   # See [#39545](https://gitlab.com/gitlab-org/gitlab-ce/issues/39545) for info about the deprecation of dynamic milestones
diff --git a/app/controllers/groups/milestones_controller.rb b/app/controllers/groups/milestones_controller.rb
index 868deea3f01..7ed4384089b 100644
--- a/app/controllers/groups/milestones_controller.rb
+++ b/app/controllers/groups/milestones_controller.rb
@@ -115,6 +115,6 @@ class Groups::MilestonesController < Groups::ApplicationController
   end
 
   def search_params
-    params.permit(:state).merge(group_ids: group.id)
+    params.permit(:state, :search_title).merge(group_ids: group.id)
   end
 end
diff --git a/app/controllers/projects/milestones_controller.rb b/app/controllers/projects/milestones_controller.rb
index 8bc59d8a305..f6f61b6e5fb 100644
--- a/app/controllers/projects/milestones_controller.rb
+++ b/app/controllers/projects/milestones_controller.rb
@@ -147,6 +147,6 @@ class Projects::MilestonesController < Projects::ApplicationController
       groups = project_group.self_and_ancestors.select(:id)
     end
 
-    params.permit(:state).merge(project_ids: @project.id, group_ids: groups)
+    params.permit(:state, :search_title).merge(project_ids: @project.id, group_ids: groups)
   end
 end
diff --git a/app/finders/milestones_finder.rb b/app/finders/milestones_finder.rb
index fcd54b6106e..77b55cbb838 100644
--- a/app/finders/milestones_finder.rb
+++ b/app/finders/milestones_finder.rb
@@ -22,6 +22,7 @@ class MilestonesFinder
     items = Milestone.all
     items = by_groups_and_projects(items)
     items = by_title(items)
+    items = by_search_title(items)
     items = by_state(items)
 
     order(items)
@@ -43,6 +44,14 @@ class MilestonesFinder
   end
   # rubocop: enable CodeReuse/ActiveRecord
 
+  def by_search_title(items)
+    if params[:search_title].present?
+      items.search_title(params[:search_title])
+    else
+      items
+    end
+  end
+
   def by_state(items)
     Milestone.filter_by_state(items, params[:state])
   end
diff --git a/app/models/dashboard_group_milestone.rb b/app/models/dashboard_group_milestone.rb
index 9bcc95e35a5..74aa04ab7d0 100644
--- a/app/models/dashboard_group_milestone.rb
+++ b/app/models/dashboard_group_milestone.rb
@@ -11,11 +11,12 @@ class DashboardGroupMilestone < GlobalMilestone
     @group_name = milestone.group.full_name
   end
 
-  def self.build_collection(groups)
-    Milestone.of_groups(groups.select(:id))
+  def self.build_collection(groups, params)
+    milestones = Milestone.of_groups(groups.select(:id))
              .reorder_by_due_date_asc
              .order_by_name_asc
              .active
-             .map { |m| new(m) }
+    milestones = milestones.search_title(params[:search_title]) if params[:search_title].present?
+    milestones.map { |m| new(m) }
   end
 end
diff --git a/app/models/global_milestone.rb b/app/models/global_milestone.rb
index 4e82f3fed27..fd17745b035 100644
--- a/app/models/global_milestone.rb
+++ b/app/models/global_milestone.rb
@@ -27,6 +27,7 @@ class GlobalMilestone
     items = Milestone.of_projects(projects)
                 .reorder_by_due_date_asc
                 .order_by_name_asc
+    items = items.search_title(params[:search_title]) if params[:search_title].present?
 
     Milestone.filter_by_state(items, params[:state]).map { |m| new(m) }
   end
diff --git a/app/models/group_milestone.rb b/app/models/group_milestone.rb
index a58537de319..97cb26c6ea9 100644
--- a/app/models/group_milestone.rb
+++ b/app/models/group_milestone.rb
@@ -5,9 +5,10 @@ class GroupMilestone < GlobalMilestone
 
   def self.build_collection(group, projects, params)
     params =
-      { state: params[:state] }
+      { state: params[:state], search_title: params[:search_title] }
 
     project_milestones = Milestone.of_projects(projects)
+    project_milestones = project_milestones.search_title(params[:search_title]) if params[:search_title].present?
     child_milestones = Milestone.filter_by_state(project_milestones, params[:state])
     grouped_milestones = child_milestones.group_by(&:title)
 
diff --git a/app/models/milestone.rb b/app/models/milestone.rb
index b21edce3aad..7ee7da99606 100644
--- a/app/models/milestone.rb
+++ b/app/models/milestone.rb
@@ -77,7 +77,7 @@ class Milestone < ActiveRecord::Base
   alias_attribute :name, :title
 
   class << self
-    # Searches for milestones matching the given query.
+    # Searches for milestones with a matching title or description.
     #
     # This method uses ILIKE on PostgreSQL and LIKE on MySQL.
     #
@@ -88,6 +88,17 @@ class Milestone < ActiveRecord::Base
       fuzzy_search(query, [:title, :description])
     end
 
+    # Searches for milestones with a matching title.
+    #
+    # This method uses ILIKE on PostgreSQL and LIKE on MySQL.
+    #
+    # query - The search query as a String
+    #
+    # Returns an ActiveRecord::Relation.
+    def search_title(query)
+      fuzzy_search(query, [:title])
+    end
+
     def filter_by_state(milestones, state)
       case state
       when 'closed' then milestones.closed
diff --git a/app/views/dashboard/milestones/index.html.haml b/app/views/dashboard/milestones/index.html.haml
index ae0e38bf0ee..13822d36f15 100644
--- a/app/views/dashboard/milestones/index.html.haml
+++ b/app/views/dashboard/milestones/index.html.haml
@@ -13,6 +13,8 @@
 
 .top-area
   = render 'shared/milestones_filter', counts: @milestone_states
+  .nav-controls
+    = render 'shared/milestones/search_form'
 
 .milestones
   %ul.content-list
diff --git a/app/views/groups/milestones/index.html.haml b/app/views/groups/milestones/index.html.haml
index af4fe8f2ef8..b6fb908c8f6 100644
--- a/app/views/groups/milestones/index.html.haml
+++ b/app/views/groups/milestones/index.html.haml
@@ -4,6 +4,7 @@
   = render 'shared/milestones_filter', counts: @milestone_states
 
   .nav-controls
+    = render 'shared/milestones/search_form'
     = render 'shared/milestones_sort_dropdown'
     - if can?(current_user, :admin_milestone, @group)
       = link_to "New milestone", new_group_milestone_path(@group), class: "btn btn-success"
diff --git a/app/views/projects/milestones/index.html.haml b/app/views/projects/milestones/index.html.haml
index 57f3c640696..ba853ef0708 100644
--- a/app/views/projects/milestones/index.html.haml
+++ b/app/views/projects/milestones/index.html.haml
@@ -6,6 +6,7 @@
     = render 'shared/milestones_filter', counts: milestone_counts(@project.milestones)
 
     .nav-controls
+      = render 'shared/milestones/search_form'
       = render 'shared/milestones_sort_dropdown'
       - if can?(current_user, :admin_milestone, @project)
         = link_to new_project_milestone_path(@project), class: "btn btn-success qa-new-project-milestone", title: 'New milestone' do
diff --git a/app/views/shared/milestones/_search_form.html.haml b/app/views/shared/milestones/_search_form.html.haml
new file mode 100644
index 00000000000..403a0224a85
--- /dev/null
+++ b/app/views/shared/milestones/_search_form.html.haml
@@ -0,0 +1,8 @@
+= form_tag request.path, method: :get do |f|
+  = search_field_tag :search_title, params[:search_title],
+    placeholder: _('Filter by milestone name'),
+    class: 'form-control input-short',
+    spellcheck: false
+  = hidden_field_tag :state, params[:state]
+  = hidden_field_tag :sort, params[:sort]
+
diff --git a/changelogs/unreleased/54905-milestone-search.yml b/changelogs/unreleased/54905-milestone-search.yml
new file mode 100644
index 00000000000..88717242e7c
--- /dev/null
+++ b/changelogs/unreleased/54905-milestone-search.yml
@@ -0,0 +1,5 @@
+---
+title: Adds milestone search
+merge_request: 24265
+author: Jacopo Beschi @jacopo-beschi
+type: added
diff --git a/lib/gitlab/sql/union.rb b/lib/gitlab/sql/union.rb
index d24d5116167..f05592fc3a3 100644
--- a/lib/gitlab/sql/union.rb
+++ b/lib/gitlab/sql/union.rb
@@ -9,7 +9,7 @@ module Gitlab
     #
     # Example usage:
     #
-    #     union = Gitlab::SQL::Union.new(user.personal_projects, user.projects)
+    #     union = Gitlab::SQL::Union.new([user.personal_projects, user.projects])
     #     sql   = union.to_sql
     #
     #     Project.where("id IN (#{sql})")
diff --git a/locale/gitlab.pot b/locale/gitlab.pot
index 795a46382a7..e64fc61ab39 100644
--- a/locale/gitlab.pot
+++ b/locale/gitlab.pot
@@ -3163,6 +3163,9 @@ msgstr ""
 msgid "Filter by commit message"
 msgstr ""
 
+msgid "Filter by milestone name"
+msgstr ""
+
 msgid "Filter by two-factor authentication"
 msgstr ""
 
diff --git a/spec/controllers/dashboard/milestones_controller_spec.rb b/spec/controllers/dashboard/milestones_controller_spec.rb
index c9ccd5f7c55..8b176e07bc8 100644
--- a/spec/controllers/dashboard/milestones_controller_spec.rb
+++ b/spec/controllers/dashboard/milestones_controller_spec.rb
@@ -56,6 +56,24 @@ describe Dashboard::MilestonesController do
       expect(json_response.map { |i| i["group_name"] }.compact).to match_array(group.name)
     end
 
+    it 'searches legacy project milestones by title when search_title is given' do
+      project_milestone = create(:milestone, title: 'Project milestone title', project: project)
+
+      get :index, params: { search_title: 'Project mil' }
+
+      expect(response.body).to include(project_milestone.title)
+      expect(response.body).not_to include(group_milestone.title)
+    end
+
+    it 'searches group milestones by title when search_title is given' do
+      group_milestone = create(:milestone, title: 'Group milestone title', group: group)
+
+      get :index, params: { search_title: 'Group mil' }
+
+      expect(response.body).to include(group_milestone.title)
+      expect(response.body).not_to include(project_milestone.title)
+    end
+
     it 'should contain group and project milestones to which the user belongs to' do
       get :index
 
diff --git a/spec/controllers/groups/milestones_controller_spec.rb b/spec/controllers/groups/milestones_controller_spec.rb
index 40d991a669c..043cf28514b 100644
--- a/spec/controllers/groups/milestones_controller_spec.rb
+++ b/spec/controllers/groups/milestones_controller_spec.rb
@@ -32,10 +32,35 @@ describe Groups::MilestonesController do
   end
 
   describe '#index' do
-    it 'shows group milestones page' do
-      get :index, params: { group_id: group.to_param }
+    describe 'as HTML' do
+      render_views
 
-      expect(response).to have_gitlab_http_status(200)
+      it 'shows group milestones page' do
+        milestone
+
+        get :index, params: { group_id: group.to_param }
+
+        expect(response).to have_gitlab_http_status(200)
+        expect(response.body).to include(milestone.title)
+      end
+
+      it 'searches legacy milestones by title when search_title is given' do
+        project_milestone = create(:milestone, project: project, title: 'Project milestone title')
+
+        get :index, params: { group_id: group.to_param, search_title: 'Project mil' }
+
+        expect(response.body).to include(project_milestone.title)
+        expect(response.body).not_to include(milestone.title)
+      end
+
+      it 'searches group milestones by title when search_title is given' do
+        group_milestone = create(:milestone, title: 'Group milestone title', group: group)
+
+        get :index, params: { group_id: group.to_param, search_title: 'Group mil' }
+
+        expect(response.body).to include(group_milestone.title)
+        expect(response.body).not_to include(milestone.title)
+      end
     end
 
     context 'as JSON' do
diff --git a/spec/controllers/projects/milestones_controller_spec.rb b/spec/controllers/projects/milestones_controller_spec.rb
index 5892024e756..ac54b3c3952 100644
--- a/spec/controllers/projects/milestones_controller_spec.rb
+++ b/spec/controllers/projects/milestones_controller_spec.rb
@@ -42,10 +42,11 @@ describe Projects::MilestonesController do
 
   describe "#index" do
     context "as html" do
-      def render_index(project:, page:)
+      def render_index(project:, page:, search_title: '')
         get :index, params: {
                       namespace_id: project.namespace.id,
                       project_id: project.id,
+                      search_title: search_title,
                       page: page
                     }
       end
@@ -59,6 +60,15 @@ describe Projects::MilestonesController do
         expect(milestones.where(project_id: nil)).to be_empty
       end
 
+      it 'searches milestones by title when search_title is given' do
+        milestone1 = create(:milestone, title: 'Project milestone title', project: project)
+
+        render_index project: project, page: 1, search_title: 'Project mile'
+
+        milestones = assigns(:milestones)
+        expect(milestones).to eq([milestone1])
+      end
+
       it 'renders paginated milestones without missing or duplicates' do
         allow(Milestone).to receive(:default_per_page).and_return(2)
         create_list(:milestone, 5, project: project)
diff --git a/spec/finders/milestones_finder_spec.rb b/spec/finders/milestones_finder_spec.rb
index 656d120311a..ecffbb9e197 100644
--- a/spec/finders/milestones_finder_spec.rb
+++ b/spec/finders/milestones_finder_spec.rb
@@ -69,6 +69,12 @@ describe MilestonesFinder do
 
       expect(result.to_a).to contain_exactly(milestone_1)
     end
+
+    it 'filters by search_title' do
+      result = described_class.new(params.merge(search_title: 'one t')).execute
+
+      expect(result.to_a).to contain_exactly(milestone_1)
+    end
   end
 
   describe '#find_by' do
diff --git a/spec/models/global_milestone_spec.rb b/spec/models/global_milestone_spec.rb
index 62699df5611..f93904065c7 100644
--- a/spec/models/global_milestone_spec.rb
+++ b/spec/models/global_milestone_spec.rb
@@ -91,6 +91,12 @@ describe GlobalMilestone do
       it 'sorts collection by due date' do
         expect(global_milestones.map(&:due_date)).to eq [milestone1_due_date, milestone1_due_date, milestone1_due_date, nil, nil, nil]
       end
+
+      it 'filters milestones by search_title when params[:search_title] is present' do
+        global_milestones = described_class.build_collection(projects, { search_title: 'v1.2' })
+
+        expect(global_milestones.map(&:title)).to match_array(['Milestone v1.2', 'Milestone v1.2', 'Milestone v1.2'])
+      end
     end
 
     context 'when adding new milestones' do
diff --git a/spec/models/milestone_spec.rb b/spec/models/milestone_spec.rb
index 2e436f2cc8a..af7e3d3a6c9 100644
--- a/spec/models/milestone_spec.rb
+++ b/spec/models/milestone_spec.rb
@@ -240,6 +240,29 @@ describe Milestone do
     end
   end
 
+  describe '#search_title' do
+    let(:milestone) { create(:milestone, title: 'foo', description: 'bar') }
+
+    it 'returns milestones with a matching title' do
+      expect(described_class.search_title(milestone.title)) .to eq([milestone])
+    end
+
+    it 'returns milestones with a partially matching title' do
+      expect(described_class.search_title(milestone.title[0..2])).to eq([milestone])
+    end
+
+    it 'returns milestones with a matching title regardless of the casing' do
+      expect(described_class.search_title(milestone.title.upcase))
+        .to eq([milestone])
+    end
+
+    it 'searches only on the title and ignores milestones with a matching description' do
+      create(:milestone, title: 'bar', description: 'foo')
+
+      expect(described_class.search_title(milestone.title)) .to eq([milestone])
+    end
+  end
+
   describe '#for_projects_and_groups' do
     let(:project) { create(:project) }
     let(:project_other) { create(:project) }