How to filter attributes?

[Yoshyn]

Hi, I want to be able to filter over attributes like this :

   render json: @model, fields: [:fields1, :fields2]

The fields options can be found here : https://github.com/rails-api/active_model_serializers/blob/master/lib/action_controller/serialization.rb

   ADAPTER_OPTION_KEYS = [:include, :fields, :adapter]

But this does not work. I try to understand a few the code and write something like this and binding inside the attributes method :

ActiveModel::Serializer::Adapter::JsonApi.new(MyModelSerializer.new(Model.find(X), fields: [:id])).serializable_hash(fields: [:fields1])

Let's see the attributes method inside serializer:

    def attributes(options = {})
      attributes =
        if options[:fields] #options is nil, @options is {:fields=>[:fields1]}
          self.class._attributes & options[:fields]
        else
          self.class._attributes.dup
        end
    ....
    end

I don't understand where i have to pass the fields options in order to the attributes method get it in these params method.
Why there's an options parameter on the attributes method. Why not use the @options var?

[joaomdmoura]

Hey @Yoshyn,

Indeed, fields seems to be only used on JSON API adapter, like included.

You can check the PR that implemented it here

I've just opened a new PR (#999) that fix some options mistakes and implements the fields option on Json Adapter.

[joaomdmoura]

@Yoshyn, have you checked #999 already? Wanted tome 👍 before thinking about merge it.

[joaomdmoura]

closing this one in favor of #1058