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changelogs/unreleased/georgekoltsov-63408-user-mapping.yml

 ---
-title: 'Fix BitBucketCloud imported project''s comments missing author line (''Created
-  by: <user>'')'
+title: 'Fix missing author line (`Created by: <user>`) in MRs/issues/comments of imported Bitbucket Cloud project'
 merge_request: 31579
 author:
 type: fixed

doc/user/project/import/bitbucket.md

@@ -31,12 +31,12 @@ to enable this if not already.
 ## How it works
 
 When issues/pull requests are being imported, the Bitbucket importer tries to find
-the Bitbucket author/assignee in GitLab's database using the Bitbucket `nickname`. For this
-to work, the Bitbucket author/assignee should have their `nickname` match their Bitbucket
-`username`, signed in beforehand in GitLab and **associated their Bitbucket account**.
-If the user is not found in GitLab's database, the project creator (most of the times the
-current user that started the import process) is set as the author, but a reference on
-the issue about the original Bitbucket author is kept.
+the Bitbucket author/assignee in GitLab's database using the Bitbucket `nickname`.
+For this to work, the Bitbucket author/assignee should have signed in beforehand in GitLab
+and **associated their Bitbucket account**. Their `nickname` must also match their Bitbucket
+`username.`. If the user is not found in GitLab's database, the project creator
+(most of the times the current user that started the import process) is set as the author,
+but a reference on the issue about the original Bitbucket author is kept.
 
 The importer will create any new namespaces (groups) if they don't exist or in
 the case the namespace is taken, the repository will be imported under the user's

lib/gitlab/bitbucket_import/importer.rb

@@ -260,20 +260,18 @@ module Gitlab
       end
 
       def pull_request_comment_attributes(comment)
-        author_id = gitlab_user_id(project, comment.author)
-
         {
           project: project,
-          note: comment_note(comment, author_id),
-          author_id: author_id,
+          note: comment_note(comment),
+          author_id: gitlab_user_id(project, comment.author),
           created_at: comment.created_at,
           updated_at: comment.updated_at
         }
       end
 
-      def comment_note(comment, author_id)
+      def comment_note(comment)
         note = ''
-        note += @formatter.author_line(comment.author) if author_id == project.creator_id
+        note += @formatter.author_line(comment.author) unless find_user_id(comment.author)
         note + comment.note
       end
 

spec/lib/gitlab/bitbucket_import/importer_spec.rb

@@ -184,11 +184,11 @@ describe Gitlab::BitbucketImport::Importer do
 
         notes = merge_request.notes.order(:id).to_a
         start_note = notes.first
-        expect(start_note.note).to include(@inline_note.note)
+        expect(start_note.note).to eq(@inline_note.note)
         expect(start_note.note).not_to include(author_line)
 
         reply_note = notes.last
-        expect(reply_note.note).to include(@reply.note)
+        expect(reply_note.note).to eq(@reply.note)
         expect(reply_note.note).not_to include(author_line)
       end
     end