from __future__ import unicode_literals import datetime import uuid from copy import deepcopy from django.core.exceptions import FieldError from django.db import DatabaseError, connection, transaction 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 ( F, Case, Col, Date, DateTime, 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 UUID, Company, Employee, Experiment, Number, Time 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, %s)" % 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)")