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require 'helper'
module Arel
module Visitors
describe 'the postgres visitor' do
before do
@visitor = PostgreSQL.new Table.engine.connection
end
describe 'locking' do
it 'defaults to FOR UPDATE' do
@visitor.accept(Nodes::Lock.new(Arel.sql('FOR UPDATE'))).must_be_like %{
FOR UPDATE
}
end
it 'allows a custom string to be used as a lock' do
node = Nodes::Lock.new(Arel.sql('FOR SHARE'))
@visitor.accept(node).must_be_like %{
FOR SHARE
}
end
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
it 'should support DISTINCT ON' do
core = Arel::Nodes::SelectCore.new
core.set_quantifier = Arel::Nodes::DistinctOn.new(Arel.sql('aaron'))
assert_match 'DISTINCT ON ( aaron )', @visitor.accept(core)
end
it 'should support DISTINCT' do
core = Arel::Nodes::SelectCore.new
core.set_quantifier = Arel::Nodes::Distinct.new
assert_equal 'SELECT DISTINCT', @visitor.accept(core)
end
end
end
end
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