[英]Serialize array/relation with attributes using ActiveModel::Serializer
I want to serialize relation using Active Model Serializers and I want to set some 'global' attributes (eg count) for this relation:我想使用 Active Model Serializers 序列化关系,并且我想为此关系设置一些“全局”属性(例如计数):
{
users: {
total: 12,
page: 2,
users: [{}, {}, {}, ...]
}
}
How could I do that?我怎么能那样做?
During your render call in the controller, you can pass in the meta attribute.在控制器中的渲染调用期间,您可以传入 meta 属性。
render @users, :each_serializer => UserSerializer, :meta => { :total => @users.count }
This will produce the following JSON:这将产生以下 JSON:
{
"users" : [...],
"meta" : {
"total" : 12
}
}
You can rename the meta key name by passing in the meta_key
option.您可以通过传入meta_key
选项来重命名元键名称。
You can define calculated properties in your serializer:您可以在序列化程序中定义计算属性:
class FooSerializer < ActiveModel::Serializer
attributes :users_count
has_many :users
def users_count
object.users.size
end
end
This will not make multiple DB calls for count
as pointed out by @rmcsharry正如@rmcsharry 所指出的,这不会进行多次数据库调用以进行count
{
data: ActiveModelSerializers::SerializableResource.new(
@users, each_serializer: UserSerializer).as_json,
count: @users.count
}
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