def test_negated_query():
expected = Not(
Exact(
ExpressionWrapper(F('char_field'),
output_field=models.CharField()), Value('')))
query_1 = ~Q(char_field='')
query_2 = Q(~Q(char_field=''))
expanded_1 = expand_query(FakeModel, query_1)
expanded_2 = expand_query(FakeModel, query_2)
assert are_equal(expected, expanded_1)
assert are_equal(expected, expanded_2)
def test_char_expression() -> None:
expected = Exact(
Lower(
ExpressionWrapper(F('char_field'),
output_field=models.CharField())), Value(''))
query_1 = Q(char_field__lower='')
query_2 = Q(char_field__lower__exact='')
expanded_1 = expand_query(FakeModel, query_1)
expanded_2 = expand_query(FakeModel, query_2)
assert are_equal(expected, expanded_1)
assert are_equal(expected, expanded_2)
def test_nested_query():
expected = Exact(
ExpressionWrapper(F('char_field'), output_field=models.CharField()),
Value(''))
query = Q(Q(char_field=''))
expanded = expand_query(FakeModel, query)
assert are_equal(expected, expanded)
def test_combining_empty_query():
# when Django combines an empty with an empty, it will only output one.
expected = EmptyQuery()
query = Q() & Q()
expanded = expand_query(FakeModel, query)
assert are_equal(expected, expanded)
assert wrap(expanded).as_python(None)
def test_negated_empty_as_a_sibling():
expected = Exact(
ExpressionWrapper(F('int_field'), output_field=IntegerField()),
Value(1))
query = Q(~Q(), Q(int_field=1))
expanded = expand_query(FakeModel, query)
assert are_equal(expected, expanded)
assert wrap(expanded).as_python(dict(int_field=1))
def test_combining_empty_with_query():
expected = Exact(
ExpressionWrapper(F('int_field'), output_field=IntegerField()),
Value(1))
query = Q() & Q(int_field=1)
expanded = expand_query(FakeModel, query)
assert are_equal(expected, expanded)
assert wrap(expanded).as_python(dict(int_field=1))
def test_and_query():
expected = And(
Exact(
ExpressionWrapper(F('char_field'),
output_field=models.CharField()), Value('')),
Exact(
ExpressionWrapper(F('int_field'),
output_field=models.IntegerField()), Value(1)),
)
queries = [
# Q(char_field='', int_field=1), # Order is not guaranteed!
Q(Q(char_field=''), int_field=1),
Q(Q(char_field=''), Q(int_field=1)),
Q(char_field='') & Q(int_field=1),
]
for query in queries:
expanded = expand_query(FakeModel, query)
assert are_equal(expected, expanded)
def test_empty_in_empty():
expected = EmptyQuery()
query = Q(Q(Q(Q())))
expanded = expand_query(FakeModel, query)
assert are_equal(expected, expanded)
assert expanded.as_python(None)
def test_multiple_empty_children():
expected = EmptyQuery()
query = Q(Q(), Q())
expanded = expand_query(FakeModel, query)
assert are_equal(expected, expanded)
assert wrap(expanded).as_python(None)
def test_negated_empty_query():
expected = EmptyQuery()
query = ~Q()
expanded = expand_query(FakeModel, query)
assert are_equal(expected, expanded)
assert wrap(expanded).as_python(None)
def as_python(self, obj: Model) -> bool:
expanded_query = expand_query(obj._meta.model, self.expression)
wrapped = wrap(expanded_query)
return cast(SupportsPythonComparison, wrapped).as_python(obj)
