Merge branch 'mentioned_inside_mr' into 'master'

Do not mention MR if commit is a part of MR

See merge request !1242

app/models/note.rb

@@ -90,7 +90,7 @@ class Note < ActiveRecord::Base
         note_options.merge!(noteable: noteable)
       end
 
-      create(note_options)
+      create(note_options) unless cross_reference_disallowed?(noteable, mentioner)
     end
 
     def create_milestone_change_note(noteable, project, author, milestone)
@@ -165,6 +165,15 @@ class Note < ActiveRecord::Base
       [:discussion, type.try(:underscore), id, line_code].join("-").to_sym
     end
 
+    # Determine if cross reference note should be created.
+    # eg. mentioning a commit in MR comments which exists inside a MR
+    # should not create "mentioned in" note.
+    def cross_reference_disallowed?(noteable, mentioner)
+      if mentioner.kind_of?(MergeRequest)
+        mentioner.commits.map(&:id).include? noteable.id
+      end
+    end
+
     # Determine whether or not a cross-reference note already exists.
     def cross_reference_exists?(noteable, mentioner)
       gfm_reference = mentioner_gfm_ref(noteable, mentioner)

spec/models/note_spec.rb

@@ -249,6 +249,12 @@ describe Note do
       its(:note) { should == "_mentioned in merge request !#{mergereq.iid}_" }
     end
 
+    context 'commit contained in a merge request' do
+      subject { Note.create_cross_reference_note(mergereq.commits.first, mergereq, author, project) }
+
+      it { should be_nil }
+    end
+
     context 'commit from issue' do
       subject { Note.create_cross_reference_note(commit, issue, author, project) }