Question

宣言：

  has_many :read_access_mappings, 
           :primary_key => "username", 
           :foreign_key => "username", 
           :class_name => 'Mapping',
           :conditions => {"mappings.read_access" => true}

收到警告：

弃用警告：User.has_many中的以下选项：read_access_mappings声明已弃用:: condition。请改为使用范围块。

如何用新语法重写它？

Answer 1

我认为最好的解决方案：

class Cls
 has_many :readable_mappings,
          -> { readable },
          primary_key: 'username',
          foreign_key: 'username',
          class_name: 'Mapping'
end

class Mapping
  scope :readable, where(read_access: true)
end

cls_instance.readable_mappings

Answer 2

也许你可以试试这个：

has_many :read_access_mappings, -> { where read_access: true },class_name: 'Mapping',
           primary_key => "username", 
           foreign_key => "username"

Source

如何使用范围块重写has_many？

2 个答案: