新增：root_subject参数

app/controllers/api/pm/issues_controller.rb

@@ -172,7 +172,7 @@ class Api::Pm::IssuesController < Api::Pm::BaseController
     params.permit(
       :status_id, :priority_id, :milestone_id,
       :branch_name, :start_date, :due_date, :time_scale,
-      :subject, :description, :blockchain_token_num,
+      :subject, :description, :blockchain_token_num, :root_subject,
       :pm_project_id, :pm_sprint_id, :pm_issue_type, :root_id, :link_able_id, :project_id,
       issue_tag_ids: [],
       assigner_ids: [],

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

@@ -4,7 +4,7 @@ class Api::V1::Issues::CreateService < ApplicationService
   include Api::V1::Issues::Concerns::Loadable 
 
   attr_reader :project, :current_user
-  attr_reader :status_id, :priority_id, :milestone_id, :branch_name, :start_date, :due_date, :subject, :description, :blockchain_token_num
+  attr_reader :status_id, :priority_id, :milestone_id, :branch_name, :start_date, :due_date, :subject, :description, :blockchain_token_num, :root_subject
   attr_reader :issue_tag_ids, :assigner_ids, :attachment_ids, :receivers_login
   attr_accessor :created_issue
 
@@ -35,6 +35,7 @@ class Api::V1::Issues::CreateService < ApplicationService
     @root_id = params[:root_id]
     @time_scale = params[:time_scale]
     @linkable_id = params[:link_able_id]
+    @root_subject = params[:root_subject]
   end
 
   def call
@@ -65,7 +66,15 @@ class Api::V1::Issues::CreateService < ApplicationService
       @created_issue.pm_project_id = @pm_project_id
       @created_issue.pm_sprint_id = @pm_sprint_id
       @created_issue.pm_issue_type = @pm_issue_type
-      @created_issue.root_id = @root_id
+      if @root_subject.present? && @pm_issue_type.to_i == 4
+        @root_issue = Issue.find_by(subject: @root_subject, pm_issue_type: 4, pm_project_id: @pm_project_id) 
+        unless @root_issue.present? 
+          @root_issue.create(subject: @root_subject, pm_issue_type: 4, pm_project_id: @pm_project_id, status_id: 1, priority_id: 1, tracker_id: Tracker.first.id, project_id: @project.id, author_id: current_user.id)
+        end
+        @created_issue.root_id = @root_issue.id
+      else
+        @created_issue.root_id = @root_id
+      end
       @created_issue.time_scale = @time_scale
       @created_issue.issue_tags_value = @issue_tags.order('id asc').pluck(:id).join(',') unless issue_tag_ids.blank?
       @created_issue.changer_id = @current_user.id