Set draft status field before saving MR

Set draft status (true/false) based on parsing the title.

app/models/merge_request.rb

@@ -125,6 +125,8 @@ class MergeRequest < ApplicationRecord
   ].freeze
   serialize :merge_params, Hash # rubocop:disable Cop/ActiveRecordSerialize
 
+  before_validation :set_draft_status
+
   after_create :ensure_merge_request_diff
   after_update :clear_memoized_shas
   after_update :reload_diff_if_branch_changed
@@ -1908,6 +1910,10 @@ class MergeRequest < ApplicationRecord
 
   private
 
+  def set_draft_status
+    self.draft = draft?
+  end
+
   def missing_report_error(report_type)
     { status: :error, status_reason: "This merge request does not have #{report_type} reports" }
   end

spec/models/merge_request_spec.rb

@@ -317,6 +317,38 @@ RSpec.describe MergeRequest, factory_default: :keep do
         expect(merge_request.target_project_id).to eq(merge_request.metrics.target_project_id)
       end
     end
+
+    describe '#set_draft_status' do
+      let(:merge_request) { create(:merge_request) }
+
+      context 'MR is a draft' do
+        before do
+          expect(merge_request.draft).to be_falsy
+
+          merge_request.title = "Draft: #{merge_request.title}"
+        end
+
+        it 'sets draft to true' do
+          merge_request.save!
+
+          expect(merge_request.draft).to be_truthy
+        end
+      end
+
+      context 'MR is not a draft' do
+        before do
+          expect(merge_request.draft).to be_falsey
+
+          merge_request.title = "This is not a draft"
+        end
+
+        it 'sets draft to true' do
+          merge_request.save!
+
+          expect(merge_request.draft).to be_falsey
+        end
+      end
+    end
   end
 
   describe 'respond to' do