Add discussion APIjprovazn-api

* adds basic discussions API for issues and snippets
* reorganizes notes specs (so same tests can be used for all noteable types - issues, MRs, snippets)

7 files changed, 25 insertions, 8 deletions

diff --git a/app/models/concerns/issuable.rb b/app/models/concerns/issuable.rb
index 7049f340c9d..52c85c7c22f 100644
--- a/app/models/concerns/issuable.rb
+++ b/app/models/concerns/issuable.rb
@@ -222,6 +222,10 @@ module Issuable
     def to_ability_name
       model_name.singular
     end
+
+    def parent_class
+      ::Project
+    end
   end
 
   def today?
diff --git a/app/models/note.rb b/app/models/note.rb
index d7a67ec277c..787a80f0196 100644
--- a/app/models/note.rb
+++ b/app/models/note.rb
@@ -81,7 +81,7 @@ class Note < ActiveRecord::Base
   validates :author, presence: true
   validates :discussion_id, presence: true, format: { with: /\A\h{40}\z/ }
 
-  validate unless: [:for_commit?, :importing?, :for_personal_snippet?] do |note|
+  validate unless: [:for_commit?, :importing?, :skip_project_check?] do |note|
     unless note.noteable.try(:project) == note.project
       errors.add(:project, 'does not match noteable project')
     end
@@ -228,7 +228,7 @@ class Note < ActiveRecord::Base
   end
 
   def skip_project_check?
-    for_personal_snippet?
+    !for_project_noteable?
   end
 
   def commit
@@ -308,6 +308,11 @@ class Note < ActiveRecord::Base
     self.noteable.supports_discussions? && !part_of_discussion?
   end
 
+  def can_create_todo?
+    # Skip system notes, and notes on project snippet
+    !system? && !for_snippet?
+  end
+
   def discussion_class(noteable = nil)
     # When commit notes are rendered on an MR's Discussion page, they are
     # displayed in one discussion instead of individually.
diff --git a/app/models/snippet.rb b/app/models/snippet.rb
index a58c208279e..644120453cf 100644
--- a/app/models/snippet.rb
+++ b/app/models/snippet.rb
@@ -168,5 +168,9 @@ class Snippet < ActiveRecord::Base
     def search_code(query)
       fuzzy_search(query, [:content])
     end
+
+    def parent_class
+      ::Project
+    end
   end
 end
diff --git a/app/services/notes/build_service.rb b/app/services/notes/build_service.rb
index abf25bb778b..77e7b8a5ea7 100644
--- a/app/services/notes/build_service.rb
+++ b/app/services/notes/build_service.rb
@@ -26,14 +26,19 @@ module Notes
       if project
         project.notes.find_discussion(discussion_id)
       else
-        # only PersonalSnippets can have discussions without project association
         discussion = Note.find_discussion(discussion_id)
         noteable = discussion.noteable
 
-        return nil unless noteable.is_a?(PersonalSnippet) && can?(current_user, :comment_personal_snippet, noteable)
+        return nil unless noteable_without_project?(noteable)
 
         discussion
       end
     end
+
+    def noteable_without_project?(noteable)
+      return true if noteable.is_a?(PersonalSnippet) && can?(current_user, :comment_personal_snippet, noteable)
+
+      false
+    end
   end
 end
diff --git a/app/services/notes/post_process_service.rb b/app/services/notes/post_process_service.rb
index 6a10e172483..ad3dcc5010b 100644
--- a/app/services/notes/post_process_service.rb
+++ b/app/services/notes/post_process_service.rb
@@ -11,7 +11,7 @@ module Notes
       unless @note.system?
         EventCreateService.new.leave_note(@note, @note.author)
 
-        return if @note.for_personal_snippet?
+        return unless @note.for_project_noteable?
 
         @note.create_cross_references!
         execute_note_hooks
diff --git a/app/services/notification_recipient_service.rb b/app/services/notification_recipient_service.rb
index 6835b14648b..e4be953e810 100644
--- a/app/services/notification_recipient_service.rb
+++ b/app/services/notification_recipient_service.rb
@@ -280,7 +280,7 @@ module NotificationRecipientService
         add_participants(note.author)
         add_mentions(note.author, target: note)
 
-        unless note.for_personal_snippet?
+        if note.for_project_noteable?
           # Merge project watchers
           add_project_watchers
 
diff --git a/app/services/todo_service.rb b/app/services/todo_service.rb
index c2ca404b179..ffd48e842c2 100644
--- a/app/services/todo_service.rb
+++ b/app/services/todo_service.rb
@@ -241,8 +241,7 @@ class TodoService
   end
 
   def handle_note(note, author, skip_users = [])
-    # Skip system notes, and notes on project snippet
-    return if note.system? || note.for_snippet?
+    return unless note.can_create_todo?
 
     project = note.project
     target  = note.noteable