更改：校验scope新增project_id

app/models/issue_tag.rb

@@ -28,7 +28,7 @@ class IssueTag < ApplicationRecord
   belongs_to :project, optional: true, counter_cache: true
   belongs_to :user, optional: true
 
-  validates :name, uniqueness: { message: "已存在" }
+  validates :name, uniqueness: {scope: :project_id, message: "已存在" }
 
   def self.init_data(project_id)
     data = [