新增：删除工作项同时删除子工作项

app/services/api/v1/issues/delete_service.rb

@@ -15,6 +15,8 @@ class Api::V1::Issues::DeleteService < ApplicationService
     raise Error, errors.full_messages.join(", ") unless valid? 
     try_lock("Api::V1::Issues::DeleteService:#{project.id}") # 开始写数据，加锁
 
+    delete_be_linkable_issues
+
     delete_issue
 
     project.incre_project_issue_cache_delete_count
@@ -38,4 +40,10 @@ class Api::V1::Issues::DeleteService < ApplicationService
     raise Error, "删除疑修失败！" unless issue.destroy!
   end
 
+  def delete_be_linkable_issues
+    pmlink_ids = PmLink.where(linkable: issue).pluck(:be_linkable_id)
+    linkable_issues = Issue.where(id: pmlink_ids)
+    raise Error, "删除疑修关联项失败！" unless linkable_issues.destroy_all
+  end
+
 end