require 'spec_helper'
module Alf
  module Engine
    describe Group::Hash do

      let(:operand){[
        {name: "Smith", city: "London"},
        {name: "Jones", city: "Paris"},
        {name: "Blake", city: "London"},
      ]}

      let(:expected){[
        { city: "London", suppliers: Relation(name: ["Smith", "Blake"]) },
        { city: "Paris",  suppliers: Relation(name: ["Jones"])          },
      ].to_set}

      it 'should group specified attributes' do
        op = Group::Hash.new(operand, AttrList[:name], :suppliers, false)
        op.to_set.should eq(expected)
      end

      it 'should allow specifying allbut grouping' do
        op = Group::Hash.new(operand, AttrList[:city], :suppliers, true)
        op.to_set.should eq(expected)
      end

    end
  end # module Engine
end # module Alf