Pass Parameters from Grape::API to Serializer

Question

I am getting a parameter e.g: member_id in Grape::API like

   desc 'Return Events'
         params do
             requires :member_id, type: Integer, desc: 'Member'
         end
         get 'all' do
              #some code
         end
     end

and I want to pass it to ActiveModel::Serializer so that I can perform some functionality.

Is there any way that I can pass it to ActiveModel::Serializer?

Answer 1

When you serialize an object using ActiveModel::Serializers, you can pass along options which are available inside the serializer as options (or instance_options, or context, depending on which version of AMS you're using).

For instance, in Rails you would pass a foo option like so:

# 0.8.x or 0.10.x
render @my_model, foo: true
MyModelSerializer.new(@my_model, foo: true).as_json

# 0.9.x
render @my_model, context: { foo: true }
MyModelSerializer.new(@my_model, context: { foo: true }).as_json

In your serializer you access options (or instance_options) to get the value:

class MyModelSerializer < ActiveModel::Serializer
  attributes :my_attribute

  def my_attribute
    # 0.8.x: options
    # 0.9.x: context
    # 0.10.x: instance_options
    if options[:foo] == true
      "foo was set"
    end
  end
def