Ruby-on-rails 如何将参数传递给 ActiveModel 序列化程序
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How to pass parameters to ActiveModel serializer
提问by Bruce Xinda Lin
I'm using active model serializer. I have a model event which has_many activities.
我正在使用活动模型序列化程序。我有一个模型事件，它有_许多活动。
I want to return the event with the first n activities. I think I should pass the params n to the event serializer.
我想用前 n 个活动返回该事件。我想我应该将参数 n 传递给事件序列化程序。
采纳答案by Logan Serman
Options passed in are available through the @optionshash. So if you do:
传入的选项可通过@options哈希获得。所以如果你这样做：
respond_with @event, activity_count: 5
You can use @options[:activity_count]within the serializer.
您可以@options[:activity_count]在序列化程序中使用。
回答by Eric Norcross
In version ~> 0.10.0you need to use @instance_options. Using @Jon Gold example from above:
在版本中，~> 0.10.0您需要使用@instance_options. 使用上面的@Jon Gold 示例：
# controller
def action
render json: @model, option_name: value
end
# serializer
class ModelSerializer::ActiveModel::Serializer
def some_method
puts @instance_options[:option_name]
end
end
回答by Jon Gold
The @optionshash was removed in 0.9; looks like an equivalent method was recently added-
的@options散列在除去0.9; 看起来最近添加了一个等效的方法-
def action
render json: @model, option_name: value
end
class ModelSerializer::ActiveModel::Serializer
def some_method
puts serialization_options[:option_name]
end
end
回答by wintondeshong
Using 0.9.3 you can use #serialization_options like so...
使用 0.9.3 你可以像这样使用 #serialization_options ......
# app/serializers/paginated_form_serializer.rb
class PaginatedFormSerializer < ActiveModel::Serializer
attributes :rows, :total_count
def rows
object.map { |o| FormSerializer.new(o) }
end
def total_count
serialization_options[:total_count]
end
end
# app/controllers/api/forms_controller.rb
class Api::FormsController < Api::ApiController
def index
forms = Form.page(params[:page_index]).per(params[:page_size])
render json: forms, serializer: PaginatedFormSerializer, total_count: Form.count, status: :ok
end
end
回答by jubeless
As of 0.10of active model serializeryou can pass arbitrary options via the instance_optionsvariable as seen here.
作为0.10的主动型串行器，你可以通过传递任意选择instance_options所看到的变量在这里。
# posts_controller.rb
class PostsController < ApplicationController
def dashboard
render json: @post, user_id: 12
end
end
# post_serializer.rb
class PostSerializer < ActiveModel::Serializer
attributes :id, :title, :body
def comments_by_me
Comments.where(user_id: instance_options[:user_id], post_id: object.id)
end
end
回答by Pushp Raj Saurabh
serialization_optionsworks well with Active Model Serialization 0.9.3.
serialization_options适用于 Active Model Serialization 0.9.3。
The options passed along with render command can be accessed in the serializer using their keys -> serialization_options[:key]
可以在序列化程序中使用它们的键 -> serialization_options[:key]访问与渲染命令一起传递的选项
回答by Mohanraj
simple way is just add activities method in the event serializer and return n number of activities. That is it.
简单的方法是在事件序列化器中添加活动方法并返回 n 个活动。这就对了。
class EventSerializer < ActiveModel::Serializer
has_many :activities
def activities
object.activities[0..9] # Select whatever you want
end
end
