require File.join(File.dirname(__FILE__), '..', '..', '..', 'spec_helper')

module Arel
  describe Alias do
    before do
      @relation = Table.new(:users)
    end

    describe '==' do
      it "obtains if the objects are the same" do
        Alias.new(@relation).should_not == Alias.new(@relation)
        (aliaz = Alias.new(@relation)).should == aliaz
      end
    end

    describe '#to_sql' do
      describe 'when there is no ambiguity' do
        it 'does not alias table names anywhere a table name can appear' do
          @relation                       \
            .where(@relation[:id].eq(1))  \
            .order(@relation[:id])        \
            .project(@relation[:id])      \
            .group(@relation[:id])        \
            .alias                        \
          .to_sql.should be_like("
            SELECT `users`.`id`
            FROM `users`
            WHERE `users`.`id` = 1
            GROUP BY `users`.`id`
            ORDER BY `users`.`id`
          ")
        end
      end
    end
  end
end