test/visitors/test_postgres.rb


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require 'helper'

module Arel
  module Visitors
    describe 'the postgres visitor' do
      before do
        @visitor = PostgreSQL.new Table.engine
      end

      it 'should produce a lock value' do
        @visitor.accept(Nodes::Lock.new).must_be_like %{
          FOR UPDATE
        }
      end

      it "should escape LIMIT" do
        sc = Arel::Nodes::SelectStatement.new
        sc.limit = Nodes::Limit.new("omg")
        sc.cores.first.projections << 'DISTINCT ON'
        sc.orders << "xyz"
        sql =  @visitor.accept(sc)
        assert_match(/LIMIT 'omg'/, sql)
        assert_equal 1, sql.scan(/LIMIT/).length, 'should have one limit'
      end
    end
  end
end