from __future__ import unicode_literals from copy import deepcopy import datetime import uuid from django.core.exceptions import FieldError from django.db import connection, transaction, DatabaseError from django.db.models import TimeField, UUIDField from django.db.models.aggregates import Avg, Count, Max, Min, StdDev, Sum, Variance from django.db.models.expressions import ( Case, Col, Date, DateTime, F, Func, OrderBy, Random, RawSQL, Ref, Value, When ) from django.db.models.functions import Coalesce, Concat, Length, Lower, Substr, Upper from django.test import TestCase, skipIfDBFeature, skipUnlessDBFeature from django.test.utils import Approximate from django.utils import six from django.utils.timezone import utc from .models import Company, Employee, Number, Experiment, Time, UUID class BasicExpressionsTests(TestCase): @classmethod def setUpTestData(cls): Company.objects.create( name="Example Inc.", num_employees=2300, num_chairs=5, ceo=Employee.objects.create(firstname="Joe", lastname="Smith") ) Company.objects.create( name="Foobar Ltd.", num_employees=3, num_chairs=4, ceo=Employee.objects.create(firstname="Frank", lastname="Meyer") ) Company.objects.create( name="Test GmbH", num_employees=32, num_chairs=1, ceo=Employee.objects.create(firstname="Max", lastname="Mustermann") ) def setUp(self): self.company_query = Company.objects.values( "name", "num_employees", "num_chairs" ).order_by( "name", "num_employees", "num_chairs" ) def test_filter_inter_attribute(self): # We can filter on attribute relationships on same model obj, e.g. # find companies where the number of employees is greater # than the number of chairs. self.assertQuerysetEqual( self.company_query.filter(num_employees__gt=F("num_chairs")), [ { "num_chairs": 5, "name": "Example Inc.", "num_employees": 2300, }, { "num_chairs": 1, "name": "Test GmbH", "num_employees": 32 }, ], lambda o: o ) def test_update(self): # We can set one field to have the value of another field # Make sure we have enough chairs self.company_query.update(num_chairs=F("num_employees")) self.assertQuerysetEqual( self.company_query, [ { "num_chairs": 2300, "name": "Example Inc.", "num_employees": 2300 }, { "num_chairs": 3, "name": "Foobar Ltd.", "num_employees": 3 }, { "num_chairs": 32, "name": "Test GmbH", "num_employees": 32 } ], lambda o: o ) def test_arithmetic(self): # We can perform arithmetic operations in expressions # Make sure we have 2 spare chairs self.company_query.update(num_chairs=F("num_employees") + 2) self.assertQuerysetEqual( self.company_query, [ { 'num_chairs': 2302, 'name': 'Example Inc.', 'num_employees': 2300 }, { 'num_chairs': 5, 'name': 'Foobar Ltd.', 'num_employees': 3 }, { 'num_chairs': 34, 'name': 'Test GmbH', 'num_employees': 32 } ], lambda o: o, ) def test_order_of_operations(self): # Law of order of operations is followed self. company_query.update( num_chairs=F('num_employees') + 2 * F('num_employees') ) self.assertQuerysetEqual( self.company_query, [ { 'num_chairs': 6900, 'name': 'Example Inc.', 'num_employees': 2300 }, { 'num_chairs': 9, 'name': 'Foobar Ltd.', 'num_employees': 3 }, { 'num_chairs': 96, 'name': 'Test GmbH', 'num_employees': 32 } ], lambda o: o, ) def test_parenthesis_priority(self): # Law of order of operations can be overridden by parentheses self.company_query.update( num_chairs=((F('num_employees') + 2) * F('num_employees')) ) self.assertQuerysetEqual( self.company_query, [ { 'num_chairs': 5294600, 'name': 'Example Inc.', 'num_employees': 2300 }, { 'num_chairs': 15, 'name': 'Foobar Ltd.', 'num_employees': 3 }, { 'num_chairs': 1088, 'name': 'Test GmbH', 'num_employees': 32 } ], lambda o: o, ) def test_update_with_fk(self): # ForeignKey can become updated with the value of another ForeignKey. self.assertEqual( Company.objects.update(point_of_contact=F('ceo')), 3 ) self.assertQuerysetEqual( Company.objects.all(), [ "Joe Smith", "Frank Meyer", "Max Mustermann", ], lambda c: six.text_type(c.point_of_contact), ordered=False ) def test_update_with_none(self): Number.objects.create(integer=1, float=1.0) Number.objects.create(integer=2) Number.objects.filter(float__isnull=False).update(float=Value(None)) self.assertQuerysetEqual( Number.objects.all(), [ None, None, ], lambda n: n.float, ordered=False ) def test_filter_with_join(self): # F Expressions can also span joins Company.objects.update(point_of_contact=F('ceo')) c = Company.objects.all()[0] c.point_of_contact = Employee.objects.create(firstname="Guido", lastname="van Rossum") c.save() self.assertQuerysetEqual( Company.objects.filter(ceo__firstname=F("point_of_contact__firstname")), [ "Foobar Ltd.", "Test GmbH", ], lambda c: c.name, ordered=False ) Company.objects.exclude( ceo__firstname=F("point_of_contact__firstname") ).update(name="foo") self.assertEqual( Company.objects.exclude( ceo__firstname=F('point_of_contact__firstname') ).get().name, "foo", ) with transaction.atomic(): with self.assertRaises(FieldError): Company.objects.exclude( ceo__firstname=F('point_of_contact__firstname') ).update(name=F('point_of_contact__lastname')) def test_object_update(self): # F expressions can be used to update attributes on single objects test_gmbh = Company.objects.get(name="Test GmbH") self.assertEqual(test_gmbh.num_employees, 32) test_gmbh.num_employees = F("num_employees") + 4 test_gmbh.save() test_gmbh = Company.objects.get(pk=test_gmbh.pk) self.assertEqual(test_gmbh.num_employees, 36) def test_object_update_fk(self): # F expressions cannot be used to update attributes which are foreign # keys, or attributes which involve joins. test_gmbh = Company.objects.get(name="Test GmbH") def test(): test_gmbh.point_of_contact = F("ceo") self.assertRaises(ValueError, test) test_gmbh.point_of_contact = test_gmbh.ceo test_gmbh.save() test_gmbh.name = F("ceo__last_name") self.assertRaises(FieldError, test_gmbh.save) def test_object_update_unsaved_objects(self): # F expressions cannot be used to update attributes on objects which do # not yet exist in the database test_gmbh = Company.objects.get(name="Test GmbH") acme = Company( name="The Acme Widget Co.", num_employees=12, num_chairs=5, ceo=test_gmbh.ceo ) acme.num_employees = F("num_employees") + 16 self.assertRaises(TypeError, acme.save) def test_ticket_11722_iexact_lookup(self): Employee.objects.create(firstname="John", lastname="Doe") Employee.objects.create(firstname="Test", lastname="test") queryset = Employee.objects.filter(firstname__iexact=F('lastname')) self.assertQuerysetEqual(queryset, [""]) @skipIfDBFeature('has_case_insensitive_like') def test_ticket_16731_startswith_lookup(self): Employee.objects.create(firstname="John", lastname="Doe") e2 = Employee.objects.create(firstname="Jack", lastname="Jackson") e3 = Employee.objects.create(firstname="Jack", lastname="jackson") self.assertQuerysetEqual( Employee.objects.filter(lastname__startswith=F('firstname')), [e2], lambda x: x) self.assertQuerysetEqual( Employee.objects.filter(lastname__istartswith=F('firstname')).order_by('pk'), [e2, e3], lambda x: x) def test_ticket_18375_join_reuse(self): # Test that reverse multijoin F() references and the lookup target # the same join. Pre #18375 the F() join was generated first, and the # lookup couldn't reuse that join. qs = Employee.objects.filter( company_ceo_set__num_chairs=F('company_ceo_set__num_employees')) self.assertEqual(str(qs.query).count('JOIN'), 1) def test_ticket_18375_kwarg_ordering(self): # The next query was dict-randomization dependent - if the "gte=1" # was seen first, then the F() will reuse the join generated by the # gte lookup, if F() was seen first, then it generated a join the # other lookups could not reuse. qs = Employee.objects.filter( company_ceo_set__num_chairs=F('company_ceo_set__num_employees'), company_ceo_set__num_chairs__gte=1) self.assertEqual(str(qs.query).count('JOIN'), 1) def test_ticket_18375_kwarg_ordering_2(self): # Another similar case for F() than above. Now we have the same join # in two filter kwargs, one in the lhs lookup, one in F. Here pre # #18375 the amount of joins generated was random if dict # randomization was enabled, that is the generated query dependent # on which clause was seen first. qs = Employee.objects.filter( company_ceo_set__num_employees=F('pk'), pk=F('company_ceo_set__num_employees') ) self.assertEqual(str(qs.query).count('JOIN'), 1) def test_ticket_18375_chained_filters(self): # Test that F() expressions do not reuse joins from previous filter. qs = Employee.objects.filter( company_ceo_set__num_employees=F('pk') ).filter( company_ceo_set__num_employees=F('company_ceo_set__num_employees') ) self.assertEqual(str(qs.query).count('JOIN'), 2) class ExpressionsTests(TestCase): def test_F_object_deepcopy(self): """ Make sure F objects can be deepcopied (#23492) """ f = F("foo") g = deepcopy(f) self.assertEqual(f.name, g.name) def test_f_reuse(self): f = F('id') n = Number.objects.create(integer=-1) c = Company.objects.create( name="Example Inc.", num_employees=2300, num_chairs=5, ceo=Employee.objects.create(firstname="Joe", lastname="Smith") ) c_qs = Company.objects.filter(id=f) self.assertEqual(c_qs.get(), c) # Reuse the same F-object for another queryset n_qs = Number.objects.filter(id=f) self.assertEqual(n_qs.get(), n) # The original query still works correctly self.assertEqual(c_qs.get(), c) def test_patterns_escape(self): """ Test that special characters (e.g. %, _ and \) stored in database are properly escaped when using a pattern lookup with an expression refs #16731 """ Employee.objects.bulk_create([ Employee(firstname="%Joh\\nny", lastname="%Joh\\n"), Employee(firstname="Johnny", lastname="%John"), Employee(firstname="Jean-Claude", lastname="Claud_"), Employee(firstname="Jean-Claude", lastname="Claude"), Employee(firstname="Jean-Claude", lastname="Claude%"), Employee(firstname="Johnny", lastname="Joh\\n"), Employee(firstname="Johnny", lastname="John"), Employee(firstname="Johnny", lastname="_ohn"), ]) self.assertQuerysetEqual( Employee.objects.filter(firstname__contains=F('lastname')), ["", "", ""], ordered=False) self.assertQuerysetEqual( Employee.objects.filter(firstname__startswith=F('lastname')), ["", ""], ordered=False) self.assertQuerysetEqual( Employee.objects.filter(firstname__endswith=F('lastname')), [""], ordered=False) def test_insensitive_patterns_escape(self): """ Test that special characters (e.g. %, _ and \) stored in database are properly escaped when using a case insensitive pattern lookup with an expression -- refs #16731 """ Employee.objects.bulk_create([ Employee(firstname="%Joh\\nny", lastname="%joh\\n"), Employee(firstname="Johnny", lastname="%john"), Employee(firstname="Jean-Claude", lastname="claud_"), Employee(firstname="Jean-Claude", lastname="claude"), Employee(firstname="Jean-Claude", lastname="claude%"), Employee(firstname="Johnny", lastname="joh\\n"), Employee(firstname="Johnny", lastname="john"), Employee(firstname="Johnny", lastname="_ohn"), ]) self.assertQuerysetEqual( Employee.objects.filter(firstname__icontains=F('lastname')), ["", "", ""], ordered=False) self.assertQuerysetEqual( Employee.objects.filter(firstname__istartswith=F('lastname')), ["", ""], ordered=False) self.assertQuerysetEqual( Employee.objects.filter(firstname__iendswith=F('lastname')), [""], ordered=False) class ExpressionsNumericTests(TestCase): def setUp(self): Number(integer=-1).save() Number(integer=42).save() Number(integer=1337).save() self.assertEqual(Number.objects.update(float=F('integer')), 3) def test_fill_with_value_from_same_object(self): """ We can fill a value in all objects with an other value of the same object. """ self.assertQuerysetEqual( Number.objects.all(), [ '', '', '' ], ordered=False ) def test_increment_value(self): """ We can increment a value of all objects in a query set. """ self.assertEqual( Number.objects.filter(integer__gt=0) .update(integer=F('integer') + 1), 2) self.assertQuerysetEqual( Number.objects.all(), [ '', '', '' ], ordered=False ) def test_filter_not_equals_other_field(self): """ We can filter for objects, where a value is not equals the value of an other field. """ self.assertEqual( Number.objects.filter(integer__gt=0) .update(integer=F('integer') + 1), 2) self.assertQuerysetEqual( Number.objects.exclude(float=F('integer')), [ '', '' ], ordered=False ) def test_complex_expressions(self): """ Complex expressions of different connection types are possible. """ n = Number.objects.create(integer=10, float=123.45) self.assertEqual(Number.objects.filter(pk=n.pk).update( float=F('integer') + F('float') * 2), 1) self.assertEqual(Number.objects.get(pk=n.pk).integer, 10) self.assertEqual(Number.objects.get(pk=n.pk).float, Approximate(256.900, places=3)) def test_incorrect_field_expression(self): with six.assertRaisesRegex(self, FieldError, "Cannot resolve keyword u?'nope' into field.*"): list(Employee.objects.filter(firstname=F('nope'))) class ExpressionOperatorTests(TestCase): def setUp(self): self.n = Number.objects.create(integer=42, float=15.5) def test_lefthand_addition(self): # LH Addition of floats and integers Number.objects.filter(pk=self.n.pk).update( integer=F('integer') + 15, float=F('float') + 42.7 ) self.assertEqual(Number.objects.get(pk=self.n.pk).integer, 57) self.assertEqual(Number.objects.get(pk=self.n.pk).float, Approximate(58.200, places=3)) def test_lefthand_subtraction(self): # LH Subtraction of floats and integers Number.objects.filter(pk=self.n.pk).update(integer=F('integer') - 15, float=F('float') - 42.7) self.assertEqual(Number.objects.get(pk=self.n.pk).integer, 27) self.assertEqual(Number.objects.get(pk=self.n.pk).float, Approximate(-27.200, places=3)) def test_lefthand_multiplication(self): # Multiplication of floats and integers Number.objects.filter(pk=self.n.pk).update(integer=F('integer') * 15, float=F('float') * 42.7) self.assertEqual(Number.objects.get(pk=self.n.pk).integer, 630) self.assertEqual(Number.objects.get(pk=self.n.pk).float, Approximate(661.850, places=3)) def test_lefthand_division(self): # LH Division of floats and integers Number.objects.filter(pk=self.n.pk).update(integer=F('integer') / 2, float=F('float') / 42.7) self.assertEqual(Number.objects.get(pk=self.n.pk).integer, 21) self.assertEqual(Number.objects.get(pk=self.n.pk).float, Approximate(0.363, places=3)) def test_lefthand_modulo(self): # LH Modulo arithmetic on integers Number.objects.filter(pk=self.n.pk).update(integer=F('integer') % 20) self.assertEqual(Number.objects.get(pk=self.n.pk).integer, 2) self.assertEqual(Number.objects.get(pk=self.n.pk).float, Approximate(15.500, places=3)) def test_lefthand_bitwise_and(self): # LH Bitwise ands on integers Number.objects.filter(pk=self.n.pk).update(integer=F('integer').bitand(56)) self.assertEqual(Number.objects.get(pk=self.n.pk).integer, 40) self.assertEqual(Number.objects.get(pk=self.n.pk).float, Approximate(15.500, places=3)) @skipUnlessDBFeature('supports_bitwise_or') def test_lefthand_bitwise_or(self): # LH Bitwise or on integers Number.objects.filter(pk=self.n.pk).update(integer=F('integer').bitor(48)) self.assertEqual(Number.objects.get(pk=self.n.pk).integer, 58) self.assertEqual(Number.objects.get(pk=self.n.pk).float, Approximate(15.500, places=3)) def test_lefthand_power(self): # LH Powert arithmetic operation on floats and integers Number.objects.filter(pk=self.n.pk).update(integer=F('integer') ** 2, float=F('float') ** 1.5) self.assertEqual(Number.objects.get(pk=self.n.pk).integer, 1764) self.assertEqual(Number.objects.get(pk=self.n.pk).float, Approximate(61.02, places=2)) def test_right_hand_addition(self): # Right hand operators Number.objects.filter(pk=self.n.pk).update(integer=15 + F('integer'), float=42.7 + F('float')) # RH Addition of floats and integers self.assertEqual(Number.objects.get(pk=self.n.pk).integer, 57) self.assertEqual(Number.objects.get(pk=self.n.pk).float, Approximate(58.200, places=3)) def test_right_hand_subtraction(self): Number.objects.filter(pk=self.n.pk).update(integer=15 - F('integer'), float=42.7 - F('float')) # RH Subtraction of floats and integers self.assertEqual(Number.objects.get(pk=self.n.pk).integer, -27) self.assertEqual(Number.objects.get(pk=self.n.pk).float, Approximate(27.200, places=3)) def test_right_hand_multiplication(self): # RH Multiplication of floats and integers Number.objects.filter(pk=self.n.pk).update(integer=15 * F('integer'), float=42.7 * F('float')) self.assertEqual(Number.objects.get(pk=self.n.pk).integer, 630) self.assertEqual(Number.objects.get(pk=self.n.pk).float, Approximate(661.850, places=3)) def test_right_hand_division(self): # RH Division of floats and integers Number.objects.filter(pk=self.n.pk).update(integer=640 / F('integer'), float=42.7 / F('float')) self.assertEqual(Number.objects.get(pk=self.n.pk).integer, 15) self.assertEqual(Number.objects.get(pk=self.n.pk).float, Approximate(2.755, places=3)) def test_right_hand_modulo(self): # RH Modulo arithmetic on integers Number.objects.filter(pk=self.n.pk).update(integer=69 % F('integer')) self.assertEqual(Number.objects.get(pk=self.n.pk).integer, 27) self.assertEqual(Number.objects.get(pk=self.n.pk).float, Approximate(15.500, places=3)) def test_righthand_power(self): # RH Powert arithmetic operation on floats and integers Number.objects.filter(pk=self.n.pk).update(integer=2 ** F('integer'), float=1.5 ** F('float')) self.assertEqual(Number.objects.get(pk=self.n.pk).integer, 4398046511104) self.assertEqual(Number.objects.get(pk=self.n.pk).float, Approximate(536.308, places=3)) class FTimeDeltaTests(TestCase): def setUp(self): sday = datetime.date(2010, 6, 25) stime = datetime.datetime(2010, 6, 25, 12, 15, 30, 747000) midnight = datetime.time(0) delta0 = datetime.timedelta(0) delta1 = datetime.timedelta(microseconds=253000) delta2 = datetime.timedelta(seconds=44) delta3 = datetime.timedelta(hours=21, minutes=8) delta4 = datetime.timedelta(days=10) # Test data is set so that deltas and delays will be # strictly increasing. self.deltas = [] self.delays = [] self.days_long = [] # e0: started same day as assigned, zero duration end = stime + delta0 e0 = Experiment.objects.create(name='e0', assigned=sday, start=stime, end=end, completed=end.date(), estimated_time=delta0) self.deltas.append(delta0) self.delays.append(e0.start - datetime.datetime.combine(e0.assigned, midnight)) self.days_long.append(e0.completed - e0.assigned) # e1: started one day after assigned, tiny duration, data # set so that end time has no fractional seconds, which # tests an edge case on sqlite. This Experiment is only # included in the test data when the DB supports microsecond # precision. if connection.features.supports_microsecond_precision: delay = datetime.timedelta(1) end = stime + delay + delta1 e1 = Experiment.objects.create(name='e1', assigned=sday, start=stime + delay, end=end, completed=end.date(), estimated_time=delta1) self.deltas.append(delta1) self.delays.append(e1.start - datetime.datetime.combine(e1.assigned, midnight)) self.days_long.append(e1.completed - e1.assigned) # e2: started three days after assigned, small duration end = stime + delta2 e2 = Experiment.objects.create(name='e2', assigned=sday - datetime.timedelta(3), start=stime, end=end, completed=end.date(), estimated_time=datetime.timedelta(hours=1)) self.deltas.append(delta2) self.delays.append(e2.start - datetime.datetime.combine(e2.assigned, midnight)) self.days_long.append(e2.completed - e2.assigned) # e3: started four days after assigned, medium duration delay = datetime.timedelta(4) end = stime + delay + delta3 e3 = Experiment.objects.create(name='e3', assigned=sday, start=stime + delay, end=end, completed=end.date(), estimated_time=delta3) self.deltas.append(delta3) self.delays.append(e3.start - datetime.datetime.combine(e3.assigned, midnight)) self.days_long.append(e3.completed - e3.assigned) # e4: started 10 days after assignment, long duration end = stime + delta4 e4 = Experiment.objects.create(name='e4', assigned=sday - datetime.timedelta(10), start=stime, end=end, completed=end.date(), estimated_time=delta4 - datetime.timedelta(1)) self.deltas.append(delta4) self.delays.append(e4.start - datetime.datetime.combine(e4.assigned, midnight)) self.days_long.append(e4.completed - e4.assigned) self.expnames = [e.name for e in Experiment.objects.all()] def test_multiple_query_compilation(self): # Ticket #21643 queryset = Experiment.objects.filter(end__lt=F('start') + datetime.timedelta(hours=1)) q1 = str(queryset.query) q2 = str(queryset.query) self.assertEqual(q1, q2) def test_query_clone(self): # Ticket #21643 qs = Experiment.objects.filter(end__lt=F('start') + datetime.timedelta(hours=1)) qs2 = qs.all() list(qs) list(qs2) def test_delta_add(self): for i in range(len(self.deltas)): delta = self.deltas[i] test_set = [e.name for e in Experiment.objects.filter(end__lt=F('start') + delta)] self.assertEqual(test_set, self.expnames[:i]) test_set = [e.name for e in Experiment.objects.filter(end__lt=delta + F('start'))] self.assertEqual(test_set, self.expnames[:i]) test_set = [e.name for e in Experiment.objects.filter(end__lte=F('start') + delta)] self.assertEqual(test_set, self.expnames[:i + 1]) def test_delta_subtract(self): for i in range(len(self.deltas)): delta = self.deltas[i] test_set = [e.name for e in Experiment.objects.filter(start__gt=F('end') - delta)] self.assertEqual(test_set, self.expnames[:i]) test_set = [e.name for e in Experiment.objects.filter(start__gte=F('end') - delta)] self.assertEqual(test_set, self.expnames[:i + 1]) def test_exclude(self): for i in range(len(self.deltas)): delta = self.deltas[i] test_set = [e.name for e in Experiment.objects.exclude(end__lt=F('start') + delta)] self.assertEqual(test_set, self.expnames[i:]) test_set = [e.name for e in Experiment.objects.exclude(end__lte=F('start') + delta)] self.assertEqual(test_set, self.expnames[i + 1:]) def test_date_comparison(self): for i in range(len(self.days_long)): days = self.days_long[i] test_set = [e.name for e in Experiment.objects.filter(completed__lt=F('assigned') + days)] self.assertEqual(test_set, self.expnames[:i]) test_set = [e.name for e in Experiment.objects.filter(completed__lte=F('assigned') + days)] self.assertEqual(test_set, self.expnames[:i + 1]) @skipUnlessDBFeature("supports_mixed_date_datetime_comparisons") def test_mixed_comparisons1(self): for i in range(len(self.delays)): delay = self.delays[i] if not connection.features.supports_microsecond_precision: delay = datetime.timedelta(delay.days, delay.seconds) test_set = [e.name for e in Experiment.objects.filter(assigned__gt=F('start') - delay)] self.assertEqual(test_set, self.expnames[:i]) test_set = [e.name for e in Experiment.objects.filter(assigned__gte=F('start') - delay)] self.assertEqual(test_set, self.expnames[:i + 1]) def test_mixed_comparisons2(self): delays = [datetime.timedelta(delay.days) for delay in self.delays] for i in range(len(delays)): delay = delays[i] test_set = [e.name for e in Experiment.objects.filter(start__lt=F('assigned') + delay)] self.assertEqual(test_set, self.expnames[:i]) test_set = [e.name for e in Experiment.objects.filter(start__lte=F('assigned') + delay + datetime.timedelta(1))] self.assertEqual(test_set, self.expnames[:i + 1]) def test_delta_update(self): for i in range(len(self.deltas)): delta = self.deltas[i] exps = Experiment.objects.all() expected_durations = [e.duration() for e in exps] expected_starts = [e.start + delta for e in exps] expected_ends = [e.end + delta for e in exps] Experiment.objects.update(start=F('start') + delta, end=F('end') + delta) exps = Experiment.objects.all() new_starts = [e.start for e in exps] new_ends = [e.end for e in exps] new_durations = [e.duration() for e in exps] self.assertEqual(expected_starts, new_starts) self.assertEqual(expected_ends, new_ends) self.assertEqual(expected_durations, new_durations) def test_invalid_operator(self): with self.assertRaises(DatabaseError): list(Experiment.objects.filter(start=F('start') * datetime.timedelta(0))) def test_durationfield_add(self): zeros = [e.name for e in Experiment.objects.filter(start=F('start') + F('estimated_time'))] self.assertEqual(zeros, ['e0']) end_less = [e.name for e in Experiment.objects.filter(end__lt=F('start') + F('estimated_time'))] self.assertEqual(end_less, ['e2']) delta_math = [e.name for e in Experiment.objects.filter(end__gte=F('start') + F('estimated_time') + datetime.timedelta(hours=1))] self.assertEqual(delta_math, ['e4']) @skipUnlessDBFeature("has_native_duration_field") def test_date_subtraction(self): under_estimate = [e.name for e in Experiment.objects.filter(estimated_time__gt=F('end') - F('start'))] self.assertEqual(under_estimate, ['e2']) over_estimate = [e.name for e in Experiment.objects.filter(estimated_time__lt=F('end') - F('start'))] self.assertEqual(over_estimate, ['e4']) class ValueTests(TestCase): def test_update_TimeField_using_Value(self): Time.objects.create() Time.objects.update(time=Value(datetime.time(1), output_field=TimeField())) self.assertEqual(Time.objects.get().time, datetime.time(1)) def test_update_UUIDField_using_Value(self): UUID.objects.create() UUID.objects.update(uuid=Value(uuid.UUID('12345678901234567890123456789012'), output_field=UUIDField())) self.assertEqual(UUID.objects.get().uuid, uuid.UUID('12345678901234567890123456789012')) class ReprTests(TestCase): def test_expressions(self): self.assertEqual( repr(Case(When(a=1))), " THEN Value(None), ELSE Value(None)>" ) self.assertEqual(repr(Col('alias', 'field')), "Col(alias, field)") self.assertEqual(repr(Date('published', 'exact')), "Date(published, exact)") self.assertEqual(repr(DateTime('published', 'exact', utc)), "DateTime(published, exact, UTC)") self.assertEqual(repr(F('published')), "F(published)") self.assertEqual(repr(F('cost') + F('tax')), "") self.assertEqual(repr(Func('published', function='TO_CHAR')), "Func(F(published), function=TO_CHAR)") self.assertEqual(repr(OrderBy(Value(1))), 'OrderBy(Value(1), descending=False)') self.assertEqual(repr(Random()), "Random()") self.assertEqual(repr(RawSQL('table.col', [])), "RawSQL(table.col, [])") self.assertEqual(repr(Ref('sum_cost', Sum('cost'))), "Ref(sum_cost, Sum(F(cost)))") self.assertEqual(repr(Value(1)), "Value(1)") def test_functions(self): self.assertEqual(repr(Coalesce('a', 'b')), "Coalesce(F(a), F(b))") self.assertEqual(repr(Concat('a', 'b')), "Concat(ConcatPair(F(a), F(b)))") self.assertEqual(repr(Length('a')), "Length(F(a))") self.assertEqual(repr(Lower('a')), "Lower(F(a))") self.assertEqual(repr(Substr('a', 1, 3)), "Substr(F(a), Value(1), Value(3))") self.assertEqual(repr(Upper('a')), "Upper(F(a))") def test_aggregates(self): self.assertEqual(repr(Avg('a')), "Avg(F(a))") self.assertEqual(repr(Count('a')), "Count(F(a), distinct=False)") self.assertEqual(repr(Max('a')), "Max(F(a))") self.assertEqual(repr(Min('a')), "Min(F(a))") self.assertEqual(repr(StdDev('a')), "StdDev(F(a), sample=False)") self.assertEqual(repr(Sum('a')), "Sum(F(a))") self.assertEqual(repr(Variance('a', sample=True)), "Variance(F(a), sample=True)")