Add can_merge option to autocomplete responseid-auto-complete-can-merge

It's used only if merge_request_iid param is provided

5 files changed, 53 insertions, 1 deletions

diff --git a/app/controllers/autocomplete_controller.rb b/app/controllers/autocomplete_controller.rb
index 091327931c2..f111c7ca8cc 100644
--- a/app/controllers/autocomplete_controller.rb
+++ b/app/controllers/autocomplete_controller.rb
@@ -16,7 +16,7 @@ class AutocompleteController < ApplicationController
       .new(params: params, current_user: current_user, project: project, group: group)
       .execute
 
-    render json: UserSerializer.new.represent(users)
+    render json: UserSerializer.new(params).represent(users, project: project)
   end
 
   def user
diff --git a/app/serializers/user_for_merge_request_entity.rb b/app/serializers/user_for_merge_request_entity.rb
new file mode 100644
index 00000000000..86a23bd0420
--- /dev/null
+++ b/app/serializers/user_for_merge_request_entity.rb
@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+class UserForMergeRequestEntity < UserEntity
+  expose :can_merge do |user, options|
+    options[:merge_request].can_be_merged_by?(user)
+  end
+end
diff --git a/app/serializers/user_serializer.rb b/app/serializers/user_serializer.rb
index 2111e1b5667..a32bf804084 100644
--- a/app/serializers/user_serializer.rb
+++ b/app/serializers/user_serializer.rb
@@ -2,4 +2,13 @@
 
 class UserSerializer < BaseSerializer
   entity UserEntity
+
+  def represent(user, opts = {}, entity = nil)
+    if params[:merge_request_iid]
+      merge_request = opts[:project].merge_requests.find_by_iid(params[:merge_request_iid])
+      super(user, opts.merge(merge_request: merge_request), UserForMergeRequestEntity)
+    else
+      super
+    end
+  end
 end
diff --git a/changelogs/unreleased/id-auto-complete-can-merge.yml b/changelogs/unreleased/id-auto-complete-can-merge.yml
new file mode 100644
index 00000000000..808eba0c34f
--- /dev/null
+++ b/changelogs/unreleased/id-auto-complete-can-merge.yml
@@ -0,0 +1,5 @@
+---
+title: Add can_merge option to autocomplete response
+merge_request: 30563
+author:
+type: added
diff --git a/spec/serializers/user_serializer_spec.rb b/spec/serializers/user_serializer_spec.rb
new file mode 100644
index 00000000000..85ff04c661c
--- /dev/null
+++ b/spec/serializers/user_serializer_spec.rb
@@ -0,0 +1,31 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe UserSerializer do
+  let(:user1) { create(:user) }
+  let(:user2) { create(:user) }
+
+  context 'serializer with merge request context' do
+    let(:project) { create(:project) }
+    let(:merge_request) { create(:merge_request) }
+    let(:serializer) { described_class.new(merge_request_iid: merge_request.iid) }
+
+    before do
+      allow(project).to(
+        receive_message_chain(:merge_requests, :find_by_iid)
+          .with(merge_request.iid).and_return(merge_request)
+      )
+
+      allow(merge_request).to receive(:can_be_merged_by?).with(user1).and_return(true)
+      allow(merge_request).to receive(:can_be_merged_by?).with(user2).and_return(false)
+    end
+
+    it 'returns a user with can_merge option' do
+      serialized_user1, serialized_user2 = serializer.represent([user1, user2], project: project).as_json
+
+      expect(serialized_user1).to include("id" => user1.id, "can_merge" => true)
+      expect(serialized_user2).to include("id" => user2.id, "can_merge" => false)
+    end
+  end
+end