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rails--rails/test/nodes/test_extract.rb
Ernie Miller 6e638bba59 Add equality to ALL THE THINGS (that matter)
People are often trying to use ARel nodes inside ActiveRecord, and when
they do so, lots of things can break, because ActiveRecord relies on
Array#uniq and sometimes hash key equality to handle values that end up
in wheres, havings, etc. By implementing equality for all the nodes, we
should hopefully be able to prevent any nodes (even nodes containing
other nodes) from failing an equality check they should otherwise pass,
and alleviate many of these errors.

Fixes #130
2012-08-18 22:33:25 -04:00

33 lines
911 B
Ruby

require 'helper'
describe Arel::Nodes::Extract do
it "should extract field" do
table = Arel::Table.new :users
table[:timestamp].extract('date').to_sql.must_be_like %{
EXTRACT(DATE FROM "users"."timestamp")
}
end
describe "as" do
it 'should alias the extract' do
table = Arel::Table.new :users
table[:timestamp].extract('date').as('foo').to_sql.must_be_like %{
EXTRACT(DATE FROM "users"."timestamp") AS foo
}
end
end
describe 'equality' do
it 'is equal with equal ivars' do
table = Arel::Table.new :users
array = [table[:attr].extract('foo'), table[:attr].extract('foo')]
assert_equal 1, array.uniq.size
end
it 'is not equal with different ivars' do
table = Arel::Table.new :users
array = [table[:attr].extract('foo'), table[:attr].extract('bar')]
assert_equal 2, array.uniq.size
end
end
end