更改：删除工作项需删除子工作项放到回调中

app/models/issue.rb

@@ -82,6 +82,7 @@ class Issue < ApplicationRecord
   has_many :assigners, through: :issue_assigners
   has_many :issue_participants, dependent: :destroy
   has_many :participants, through: :issue_participants
+  has_many :children_issues, class_name: 'Issue', foreign_key: :root_id, dependent: :destroy
   has_many :show_participants, -> {joins(:issue_participants).where.not(issue_participants: {participant_type: 'atme'}).distinct}, through: :issue_participants, source: :participant
   has_many :show_assigners, -> {joins(:issue_assigners).distinct}, through: :issue_assigners, source: :assigner
   has_many :show_issue_tags, -> {joins(:issue_tags_relates).distinct}, through: :issue_tags_relates, source: :issue_tag

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

@@ -15,8 +15,6 @@ 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_zi_issues
-
     delete_issue
 
     project.incre_project_issue_cache_delete_count
@@ -39,10 +37,4 @@ class Api::V1::Issues::DeleteService < ApplicationService
   def delete_issue
     raise Error, "删除疑修失败！" unless issue.destroy!
   end
-
-  def delete_zi_issues
-    zi_issues = Issue.where(pm_project_id:issue.pm_project_id, root_id: issue.id)
-    raise Error, "删除疑修关联项失败！" unless zi_issues.destroy_all
-  end
-
 end