ADD some columns for pull

db/migrate/20201104034658_add_commits_count_and_files_count_to_pull_requests.rb

@@ -0,0 +1,7 @@
+class AddCommitsCountAndFilesCountToPullRequests < ActiveRecord::Migration[5.2]
+  def change
+    add_column :pull_requests, :comments_count, :integer, default: 0, comment: 'number of comments for pull request'
+    add_column :pull_requests, :commits_count, :integer, default: 0, comment: 'number of git commits for pull request'
+    add_column :pull_requests, :files_count, :integer, default: 0, comment: 'number of git change files for pull request'
+  end
+end