path: root/spec/active_relation/unit/relations/selection_spec.rb

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

module ActiveRelation
  describe Selection do
    before do
      @relation = Table.new(:users)
      @predicate = Equality.new(@relation[:id], 1.bind(@relation))
    end
  
    describe '#initialize' do
      it "manufactures nested selection relations if multiple predicates are provided" do
        @predicate2 = LessThan.new(@relation[:age], 2.bind(@relation))
        Selection.new(@relation, @predicate, @predicate2). \
          should == Selection.new(Selection.new(@relation, @predicate2), @predicate)
      end
    end
  
    describe '#qualify' do
      it "descends" do
        Selection.new(@relation, @predicate).qualify. \
          should == Selection.new(@relation, @predicate).descend(&:qualify)
      end
    end

    describe '#descend' do
      it "distributes a block over the relation and predicates" do
        Selection.new(@relation, @predicate).descend(&:qualify). \
          should == Selection.new(@relation.descend(&:qualify), @predicate.descend(&:qualify))
      end
    end
  
    describe '#to_sql' do
      it "manufactures sql with where clause conditions" do
        Selection.new(@relation, @predicate).to_sql.should be_like("
          SELECT `users`.`id`, `users`.`name`
          FROM `users`
          WHERE `users`.`id` = 1
        ")
      end
    
      it "allows arbitrary sql" do
        Selection.new(@relation, "asdf".bind(@relation)).to_sql.should be_like("
          SELECT `users`.`id`, `users`.`name`
          FROM `users`
          WHERE asdf
        ")
      end
    end
  end
end