ArgumentError: The association scope 'children' is instance dependent (the scope block takes an argument). Preloading instance dependent scopes is not supported.

def check_preloadable!
     return unless scope

     if scope.arity > 0
       raise ArgumentError, <<-MSG.squish
         The association scope '#{name}' is instance dependent (the scope
         block takes an argument). Preloading instance dependent scopes is
         not supported.
       MSG
     end
   end
   ...

这个是源码

需求是一张表通过 parent_id 关联自己 (has_many: children)，但是还要加一个条件

class Cm::ProductCategory < ApplicationRecord
has_many :children, ->(p) {where(version_id: p.version_id)}, class_name: 'Cm::ProductCategory', primary_key: :product_category_id, foreign_key: :parent_id
...

这样写，includes 就报错