Remove deprecation warning for ActiveModel::Errors#keys

app/controllers/concerns/notes_actions.rb

@@ -62,7 +62,7 @@ module NotesActions
           json.merge!(note_json(@note))
         end
 
-        if @note.errors.present? && @note.errors.keys != [:commands_only]
+        if @note.errors.present? && @note.errors.attribute_names != [:commands_only]
           render json: json, status: :unprocessable_entity
         else
           render json: json

lib/api/notes.rb

@@ -88,7 +88,7 @@ module API
 
           note = create_note(noteable, opts)
 
-          if note.errors.keys == [:commands_only]
+          if note.errors.attribute_names == [:commands_only]
             status 202
             present note, with: Entities::NoteCommands
           elsif note.valid?

spec/models/pages_domain_spec.rb

@@ -94,7 +94,7 @@ RSpec.describe PagesDomain do
 
       with_them do
         it "is adds the expected errors" do
-          expect(pages_domain.errors.keys).to eq errors_on
+          expect(pages_domain.errors.attribute_names).to eq errors_on
         end
       end
     end
@@ -155,7 +155,7 @@ RSpec.describe PagesDomain do
         it "adds error to certificate" do
           domain.valid?
 
-          expect(domain.errors.keys).to contain_exactly(:key, :certificate)
+          expect(domain.errors.attribute_names).to contain_exactly(:key, :certificate)
         end
       end
 
@@ -165,7 +165,7 @@ RSpec.describe PagesDomain do
 
           domain.valid?
 
-          expect(domain.errors.keys).to contain_exactly(:key)
+          expect(domain.errors.attribute_names).to contain_exactly(:key)
         end
       end
     end