修复：child_count的更新

app/controllers/api/pm/issues_controller.rb

@@ -213,7 +213,8 @@ class Api::Pm::IssuesController < Api::Pm::BaseController
               children_issue = Issue.where(fake_id: row[0]).last
               parent_issue = Issue.where(fake_id: row[1]).last
               next if children_issue.blank? || parent_issue.blank? 
-              children_issue.update_column(:root_id, parent_issue.id)
+              children_issue.root_id = parent_issue.id
+              children_issue.save(touch: false)
             end
           when 'link_relations'
             sheet.rows.each.with_index do |row, index|