ruby-on-rails – 在Rails中为所有活动记录模型添加查找条件

class ExampleModel < ActiveRecord::Base
  default_scope :conditions => ["status = ?","active"]
end

如果要在所有模型中使用它,可以将ActiveRecord :: Base子类化,并从所有模型中派生出来(可能不适用于单表继承)：

class MyModel < ActiveRecord::Base
  default_scope :conditions => ["status = ?","active"]
end
class ExampleModel < MyModel
end

…或者您可以在ActiveRecord :: Base本身上设置default_scope(如果您确定一个模型不应该具有此默认范围,则可能会很烦人)：

class ActiveRecord::Base
  default_scope :conditions => ["status = ?","active"]
end
class ExampleModel < ActiveRecord::Base
end

正如klochner在评论中所提到的,您可能还想考虑将named_scope添加到ActiveRecord :: Base,名为active,例如：

class ActiveRecord::Base
  named_scope :active,:conditions => ["status = ?","active"]
end
class ExampleModel < ActiveRecord::Base
end
ExampleModel.active  # Return all active items.