def rel_f(instances, filter_f):
instances = deferred_to_real(instances)
c = {}
c['%s__in' % to_model_field] = [
getattr(instance, from_model_fk_field) for instance in instances
]
q = to_model.objects.filter(**c)
if to_model_field not in ['pk', 'id']:
f = {}
f[to_model_field] = to_model_field
q = q.extra(select=f)
q = filter_f(q)
to_from = {}
for instance in instances:
k = getattr(instance, from_model_fk_field)
if k not in to_from:
to_from[k] = []
to_from[k].append(instance)
r = []
for obj in q:
for src in to_from[getattr(obj, to_model_field)]:
r.append((obj, src.pk))
return r
def test_conversion_uses_single_query(self):
# We have to prefix with .all() to prevent the object cache from returning complete
# objects from previous queries
entries = list(Entry.objects.all().filter(blog__name='Databases').only('id'))
with override_settings(DEBUG=True):
entries = list(deferred_to_real(entries))
self.assertEquals(len(connection.queries) - self.query_count, 1)
def rel_f(instances, filter_f):
instances = deferred_to_real(instances)
c = {}
c['%s__in' % to_model_field] = [getattr(instance, from_model_fk_field) for instance in instances]
q = to_model.objects.filter(**c)
if to_model_field not in ['pk', 'id']:
f = {}
f[to_model_field] = to_model_field
q = q.extra(select=f)
q = filter_f(q)
to_from = {}
for instance in instances:
k = getattr(instance, from_model_fk_field)
if k not in to_from:
to_from[k] = []
to_from[k].append(instance)
r = []
for obj in q:
for src in to_from[getattr(obj, to_model_field)]:
r.append((obj, src.pk))
return r
def test_conversion_uses_single_query(self):
# We have to prefix with .all() to prevent the object cache from returning complete
# objects from previous queries
entries = list(
Entry.objects.all().filter(blog__name='Databases').only('id'))
with override_settings(DEBUG=True):
entries = list(deferred_to_real(entries))
self.assertEquals(len(connection.queries) - self.query_count, 1)
def test_converts_deferred_objects_to_real_objects(self):
entries = list(Entry.objects.all().filter(blog__name='Databases').only('id'))
self.assertEquals(len(entries), 3)
# test objects are deferred
for entry in entries:
self.assertEquals('id' in entry.__dict__, True)
self.assertEquals('headline' in entry.__dict__, False)
# convert to real
entries = deferred_to_real(entries)
self.assertEquals(len(entries), 3)
for entry in entries:
self.assertEquals('id' in entry.__dict__, True)
self.assertEquals('headline' in entry.__dict__, True)
def test_converts_deferred_objects_to_real_objects(self):
entries = list(
Entry.objects.all().filter(blog__name='Databases').only('id'))
self.assertEquals(len(entries), 3)
# test objects are deferred
for entry in entries:
self.assertEquals('id' in entry.__dict__, True)
self.assertEquals('headline' in entry.__dict__, False)
# convert to real
entries = deferred_to_real(entries)
self.assertEquals(len(entries), 3)
for entry in entries:
self.assertEquals('id' in entry.__dict__, True)
self.assertEquals('headline' in entry.__dict__, True)
def test_converts_mixture_of_deferred_and_real_objects(self):
real_entries = list(Entry.objects.all().filter(blog__name='Databases'))
self.assertEquals(len(real_entries), 3)
# test objects are real
for entry in real_entries:
self.assertEquals('id' in entry.__dict__, True)
self.assertEquals('headline' in entry.__dict__, True)
deferred_entries = list(Entry.objects.all().filter(blog__name='Databases').only('id'))
self.assertEquals(len(deferred_entries), 3)
# test objects are deferred
for entry in deferred_entries:
self.assertEquals('id' in entry.__dict__, True)
self.assertEquals('headline' in entry.__dict__, False)
# convert to real and uniquefy
entries = deferred_to_real(real_entries+deferred_entries)
self.assertEquals(len(entries), 3)
for entry in entries:
self.assertEquals('id' in entry.__dict__, True)
self.assertEquals('headline' in entry.__dict__, True)
def test_converts_mixture_of_deferred_and_real_objects(self):
real_entries = list(Entry.objects.all().filter(blog__name='Databases'))
self.assertEquals(len(real_entries), 3)
# test objects are real
for entry in real_entries:
self.assertEquals('id' in entry.__dict__, True)
self.assertEquals('headline' in entry.__dict__, True)
deferred_entries = list(
Entry.objects.all().filter(blog__name='Databases').only('id'))
self.assertEquals(len(deferred_entries), 3)
# test objects are deferred
for entry in deferred_entries:
self.assertEquals('id' in entry.__dict__, True)
self.assertEquals('headline' in entry.__dict__, False)
# convert to real and uniquefy
entries = deferred_to_real(real_entries + deferred_entries)
self.assertEquals(len(entries), 3)
for entry in entries:
self.assertEquals('id' in entry.__dict__, True)
self.assertEquals('headline' in entry.__dict__, True)