JsonApiDeserializer

JsonApiDeserializer.rb

class JsonApiDeserializer
  MEDIA_TYPE = 'application/vnd.api+json'.freeze

  def initialize(request)
    @request = request
  end

  def params
    deserialized_params if valid?
  end

  private

  def deserialized_params
    ActionController::Parameters.new(deserialize(JSON.parse(request_params)))
  end

  def deserialize(body)
    JSONAPI::Deserializable::Resource.call(body)
  rescue JSONAPI::Parser::InvalidDocument => error
    raise Networking::JsonApiError, error
  end

  def request_params
    request.body.read
  end

  class MediaTypeError < ArgumentError
    def message
      I18n.t('media_type_error')
    end
  end

  attr_reader :request
end

sessions_controller.rb

module Api
  module V1
    module Auth
      class SessionsController < ApiController
        def create
          respond_with(user, class: serializer)
        end

        private

        def user
          @user ||= ::Users::Operation::Save.new(params: user_params).call
        end

        def user_params
          current_fair_type.authentication.new(session_params).response
        end

        def session_params
          deserialized_params.permit(:email, :password, :terms_accepted_at)
        end

        def serializer
          CurrentUserSerializer
        end
        
        # ovo mozes staviti u neki concern i includeati u API base controlleru mozda
        def deserialized_params
          @deserialized_params ||= JsonApiDeserializer.new(request).params
        end
      end
    end
  end
end