object_serializer_attribute_param_spec.rb

require 'spec_helper'

describe FastJsonapi::ObjectSerializer do
  include_context 'movie class'

  context "params option" do
    let(:hash) { serializer.serializable_hash }

    before(:context) do
      class Movie
        def viewed?(user)
          user.viewed.include?(id)
        end
      end

      class MovieSerializer
        attribute :viewed do |movie, params|
          params[:user] ? movie.viewed?(params[:user]) : false
        end

        attribute :no_param_attribute do |movie|
          "no-param-attribute"
        end
      end

      User = Struct.new(:viewed)
    end

    after(:context) do
      Object.send(:remove_const, User) if Object.constants.include?(User)
    end

    context "enforces a hash only params" do
      let(:params) { User.new([]) }

      it "fails when creating a serializer with an object as params" do
        expect(-> { MovieSerializer.new(movie, {params: User.new([])}) }).to raise_error(ArgumentError)
      end

      it "succeeds creating a serializer with a hash" do
        expect(-> { MovieSerializer.new(movie, {params: {current_user: User.new([])}}) }).not_to raise_error
      end
    end

    context "passing params to the serializer" do
      let(:params) { {user: User.new([movie.id])} }
      let(:options_with_params) { {params: params} }

      context "with a single record" do
        let(:serializer) { MovieSerializer.new(movie, options_with_params) }

        it "handles attributes that use params" do
          expect(hash[:data][:attributes][:viewed]).to eq(true)
        end

        it "handles attributes that don't use params" do
          expect(hash[:data][:attributes][:no_param_attribute]).to eq("no-param-attribute")
        end
      end

      context "with a list of records" do
        let(:movies) { build_movies(3) }
        let(:user) { User.new(movies.map { |m| [true, false].sample ? m.id : nil }.compact) }
        let(:params) { {user: user} }
        let(:serializer) { MovieSerializer.new(movies, options_with_params) }

        it "has 3 items" do
          hash[:data].length == 3
        end

        it "handles passing params to a list of resources" do
          param_attribute_values = hash[:data].map { |data| [data[:id], data[:attributes][:viewed]] }
          expected_values = movies.map { |m| [m.id.to_s, user.viewed.include?(m.id)] }

          expect(param_attribute_values).to eq(expected_values)
        end

        it "handles attributes without params" do
          no_param_attribute_values = hash[:data].map { |data| data[:attributes][:no_param_attribute] }
          expected_values = (1..3).map { "no-param-attribute" }

          expect(no_param_attribute_values).to eq(expected_values)
        end
      end
    end

    context "without passing params to the serializer" do
      context "with a single movie" do
        let(:serializer) { MovieSerializer.new(movie) }

        it "handles param attributes" do
          expect(hash[:data][:attributes][:viewed]).to eq(false)
        end

        it "handles attributes that don't use params" do
          expect(hash[:data][:attributes][:no_param_attribute]).to eq("no-param-attribute")
        end
      end

      context "with multiple movies" do
        let(:serializer) { MovieSerializer.new(build_movies(3)) }

        it "handles attributes with params" do
          param_attribute_values = hash[:data].map { |data| data[:attributes][:viewed] }

          expect(param_attribute_values).to eq([false, false, false])
        end

        it "handles attributes that don't use params" do
          no_param_attribute_values = hash[:data].map { |data| data[:attributes][:no_param_attribute] }
          expected_attribute_values = (1..3).map { "no-param-attribute" }

          expect(no_param_attribute_values).to eq(expected_attribute_values)
        end
      end
    end
  end
end