rails active model serializer not doing anything

问题

I am using the the GEM found here: https://rubygems.org/gems/active_model_serializers

I've created the serializer using rails g, added it to the controller where I return json but it is still returning everything and not the defined attributes - Any ideas?

module Api
    module V1
        class ProductDetailsController < ApplicationController          
            def show
                @prod = ProductPrice.joins(:product, :retailer).select("*")
                render json: @prod, serializer: ProductDetailSerializer
            end 
        end
    end
end

class ProductDetailSerializer < ActiveModel::Serializer
  attributes :id
end

Thanks.

回答1:

Either your query is wrong - I´m guessing that since you are defining a show method what you are looking for is something like this:

module Api
    module V1
        class ProductDetailsController < ApplicationController          
            def show
                @prod = ProductPrice.joins(:product, :retailer).find(params[:id])
                render json: @prod, serializer: ProductDetailSerializer
            end 
        end
    end
end

If you really intend to serialize an array of ProductPrice objects you need to pass the each_serializer option.

module Api
    module V1
        class ProductDetailsController < ApplicationController          
            def show
                @prod = ProductPrice.joins(:product, :retailer).all
                render json: @prod, each_serializer: ProductDetailSerializer
            end 
        end
    end
end

来源：https://stackoverflow.com/questions/29930777/rails-active-model-serializer-not-doing-anything