新增：删除fork仓库关闭对应合并请求

app/controllers/projects_controller.rb

@@ -258,6 +258,7 @@ class ProjectsController < ApplicationController
   def destroy
     if current_user.admin? || @project.manager?(current_user)
       ActiveRecord::Base.transaction do
+        close_fork_pull_requests_by(@project)
         Gitea::Repository::DeleteService.new(@project.owner, @project.identifier,current_user.gitea_token).call
         @project.destroy!
         @project.forked_projects.update_all(forked_from_project_id: nil)
@@ -408,4 +409,19 @@ class ProjectsController < ApplicationController
       render_unauthorized('你还未登录.')
     end
   end
+
+  def close_fork_pull_requests_by(project)
+    open_pull_requests = PullRequest.where(fork_project_id: project.id)
+    if open_pull_requests.present?
+      open_pull_requests.each do |pull_request|
+        closed = PullRequests::CloseService.call(pull_request&.project.owner, pull_request&.project.repository, pull_request, current_user)
+        if closed === true
+          pull_request.project_trends.create!(user: current_user, project: pull_request&.project,action_type: ProjectTrend::CLOSE)
+          # 合并请求下issue处理为关闭
+          pull_request.issue&.update_attributes!({status_id:5})
+          SendTemplateMessageJob.perform_later('PullRequestClosed', current_user.id, pull_request.id) if Site.has_notice_menu?
+        end
+      end 
+    end
+  end
 end