def test_ordering():
from xotl.ql.translation.py import naive_translation
@thesefy
class Universe(int):
pass
Universe.this_instances = [Universe(i) for i in range(2, 10)]
query = these((which for which in Universe),
ordering=lambda which: -which)
plan = naive_translation(query)
assert list(plan()) == list(reversed(range(2, 10)))
query = these((which for which in Universe),
ordering=lambda which: +which)
plan = naive_translation(query)
assert list(plan()) == list(range(2, 10)) #XXX: Py3k list()
query = these((person for person in Person),
ordering=lambda person: -person.age)
plan = naive_translation(query)
results = list(plan())
assert manolito == results[-1]
assert elsa == results[0]
query = these((person for person in Person if person.children))
plan = naive_translation(query)
results = list(plan())
parents = (manu, yade, pedro, papi, elsa, ppp, denia)
for who in parents:
assert who in results
assert len(results) == len(parents)
from xotl.ql.expressions import sum_
query = these((person for person in Person if person.children),
ordering=lambda person: (-sum_(child.age for child in person.children), -person.age))
plan = naive_translation(query)
results = list(plan())
assert pedro == results[0]
def test_all_pred(**kwargs):
from xoutil.iterators import dict_update_new
from xotl.ql.expressions import all_, sum_
from xotl.ql.translation.py import naive_translation
query = these(parent
for parent in Person
if parent.children
if all_((30 < child.age) & (child.age < 36) for child in parent.children))
dict_update_new(kwargs, dict(only='test_translate.*'))
plan = naive_translation(query, **kwargs)
result = list(plan())
assert elsa in result
assert papi in result
assert len(result) == 2
query = these(parent
for parent in Person
if parent.children
if all_(parent.name.startswith('Manu'), parent.age > 30))
dict_update_new(kwargs, dict(only='test_translate.*'))
plan = naive_translation(query, **kwargs)
with pytest.raises(SyntaxError):
result = list(plan())
query = these(parent
for parent in Person
if parent.children
if sum_(child.age for child in parent.children) > 60)
dict_update_new(kwargs, dict(only='test_translate.*'))
plan = naive_translation(query, **kwargs)
result = list(plan())
assert denia in result
assert pedro in result
assert len(result) == 2
