mirror of https://github.com/django/django.git
220 lines
8.9 KiB
Python
220 lines
8.9 KiB
Python
from datetime import datetime
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from django.core.exceptions import FieldError
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from django.db import DEFAULT_DB_ALIAS, connection
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from django.db.models import BooleanField, CharField, F, Q
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from django.db.models.expressions import (
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Col,
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Exists,
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ExpressionWrapper,
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Func,
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RawSQL,
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Value,
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)
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from django.db.models.fields.related_lookups import RelatedIsNull
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from django.db.models.functions import Lower
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from django.db.models.lookups import Exact, GreaterThan, IsNull, LessThan
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from django.db.models.sql.constants import SINGLE
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from django.db.models.sql.query import JoinPromoter, Query, get_field_names_from_opts
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from django.db.models.sql.where import OR
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from django.test import SimpleTestCase, TestCase, skipUnlessDBFeature
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from django.test.utils import register_lookup
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from .models import Author, Item, ObjectC, Ranking
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class TestQuery(SimpleTestCase):
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def test_simple_query(self):
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query = Query(Author)
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where = query.build_where(Q(num__gt=2))
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lookup = where.children[0]
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self.assertIsInstance(lookup, GreaterThan)
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self.assertEqual(lookup.rhs, 2)
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self.assertEqual(lookup.lhs.target, Author._meta.get_field("num"))
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def test_non_alias_cols_query(self):
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query = Query(Author, alias_cols=False)
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where = query.build_where(Q(num__gt=2, name__isnull=False) | Q(num__lt=F("id")))
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name_isnull_lookup, num_gt_lookup = where.children[0].children
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self.assertIsInstance(num_gt_lookup, GreaterThan)
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self.assertIsInstance(num_gt_lookup.lhs, Col)
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self.assertIsNone(num_gt_lookup.lhs.alias)
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self.assertIsInstance(name_isnull_lookup, IsNull)
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self.assertIsInstance(name_isnull_lookup.lhs, Col)
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self.assertIsNone(name_isnull_lookup.lhs.alias)
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num_lt_lookup = where.children[1]
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self.assertIsInstance(num_lt_lookup, LessThan)
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self.assertIsInstance(num_lt_lookup.rhs, Col)
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self.assertIsNone(num_lt_lookup.rhs.alias)
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self.assertIsInstance(num_lt_lookup.lhs, Col)
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self.assertIsNone(num_lt_lookup.lhs.alias)
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def test_complex_query(self):
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query = Query(Author)
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where = query.build_where(Q(num__gt=2) | Q(num__lt=0))
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self.assertEqual(where.connector, OR)
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lookup = where.children[0]
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self.assertIsInstance(lookup, GreaterThan)
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self.assertEqual(lookup.rhs, 2)
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self.assertEqual(lookup.lhs.target, Author._meta.get_field("num"))
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lookup = where.children[1]
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self.assertIsInstance(lookup, LessThan)
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self.assertEqual(lookup.rhs, 0)
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self.assertEqual(lookup.lhs.target, Author._meta.get_field("num"))
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def test_multiple_fields(self):
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query = Query(Item, alias_cols=False)
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where = query.build_where(Q(modified__gt=F("created")))
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lookup = where.children[0]
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self.assertIsInstance(lookup, GreaterThan)
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self.assertIsInstance(lookup.rhs, Col)
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self.assertIsNone(lookup.rhs.alias)
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self.assertIsInstance(lookup.lhs, Col)
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self.assertIsNone(lookup.lhs.alias)
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self.assertEqual(lookup.rhs.target, Item._meta.get_field("created"))
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self.assertEqual(lookup.lhs.target, Item._meta.get_field("modified"))
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def test_transform(self):
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query = Query(Author, alias_cols=False)
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with register_lookup(CharField, Lower):
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where = query.build_where(~Q(name__lower="foo"))
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lookup = where.children[0]
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self.assertIsInstance(lookup, Exact)
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self.assertIsInstance(lookup.lhs, Lower)
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self.assertIsInstance(lookup.lhs.lhs, Col)
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self.assertIsNone(lookup.lhs.lhs.alias)
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self.assertEqual(lookup.lhs.lhs.target, Author._meta.get_field("name"))
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def test_negated_nullable(self):
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query = Query(Item)
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where = query.build_where(~Q(modified__lt=datetime(2017, 1, 1)))
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self.assertTrue(where.negated)
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lookup = where.children[0]
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self.assertIsInstance(lookup, LessThan)
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self.assertEqual(lookup.lhs.target, Item._meta.get_field("modified"))
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lookup = where.children[1]
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self.assertIsInstance(lookup, IsNull)
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self.assertEqual(lookup.lhs.target, Item._meta.get_field("modified"))
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def test_foreign_key(self):
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query = Query(Item)
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msg = "Joined field references are not permitted in this query"
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with self.assertRaisesMessage(FieldError, msg):
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query.build_where(Q(creator__num__gt=2))
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def test_foreign_key_f(self):
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query = Query(Ranking)
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with self.assertRaises(FieldError):
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query.build_where(Q(rank__gt=F("author__num")))
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def test_foreign_key_exclusive(self):
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query = Query(ObjectC, alias_cols=False)
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where = query.build_where(Q(objecta=None) | Q(objectb=None))
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a_isnull = where.children[0]
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self.assertIsInstance(a_isnull, RelatedIsNull)
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self.assertIsInstance(a_isnull.lhs, Col)
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self.assertIsNone(a_isnull.lhs.alias)
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self.assertEqual(a_isnull.lhs.target, ObjectC._meta.get_field("objecta"))
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b_isnull = where.children[1]
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self.assertIsInstance(b_isnull, RelatedIsNull)
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self.assertIsInstance(b_isnull.lhs, Col)
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self.assertIsNone(b_isnull.lhs.alias)
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self.assertEqual(b_isnull.lhs.target, ObjectC._meta.get_field("objectb"))
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def test_clone_select_related(self):
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query = Query(Item)
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query.add_select_related(["creator"])
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clone = query.clone()
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clone.add_select_related(["note", "creator__extra"])
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self.assertEqual(query.select_related, {"creator": {}})
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def test_iterable_lookup_value(self):
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query = Query(Item)
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where = query.build_where(Q(name=["a", "b"]))
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name_exact = where.children[0]
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self.assertIsInstance(name_exact, Exact)
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self.assertEqual(name_exact.rhs, "['a', 'b']")
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def test_filter_conditional(self):
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query = Query(Item)
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where = query.build_where(Func(output_field=BooleanField()))
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exact = where.children[0]
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self.assertIsInstance(exact, Exact)
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self.assertIsInstance(exact.lhs, Func)
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self.assertIs(exact.rhs, True)
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def test_filter_conditional_join(self):
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query = Query(Item)
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filter_expr = Func("note__note", output_field=BooleanField())
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msg = "Joined field references are not permitted in this query"
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with self.assertRaisesMessage(FieldError, msg):
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query.build_where(filter_expr)
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def test_filter_non_conditional(self):
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query = Query(Item)
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msg = "Cannot filter against a non-conditional expression."
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with self.assertRaisesMessage(TypeError, msg):
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query.build_where(Func(output_field=CharField()))
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class TestQueryNoModel(TestCase):
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def test_rawsql_annotation(self):
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query = Query(None)
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sql = "%s IS NULL"
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# Wrap with a CASE WHEN expression if a database backend (e.g. Oracle)
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# doesn't support boolean expression in SELECT list.
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if not connection.features.supports_boolean_expr_in_select_clause:
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sql = f"CASE WHEN {sql} THEN 1 ELSE 0 END"
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query.add_annotation(RawSQL(sql, (None,), BooleanField()), "_check")
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result = query.get_compiler(using=DEFAULT_DB_ALIAS).execute_sql(SINGLE)
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self.assertEqual(result[0], 1)
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def test_subquery_annotation(self):
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query = Query(None)
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query.add_annotation(Exists(Item.objects.all()), "_check")
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result = query.get_compiler(using=DEFAULT_DB_ALIAS).execute_sql(SINGLE)
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self.assertEqual(result[0], 0)
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@skipUnlessDBFeature("supports_boolean_expr_in_select_clause")
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def test_q_annotation(self):
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query = Query(None)
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check = ExpressionWrapper(
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Q(RawSQL("%s IS NULL", (None,), BooleanField()))
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| Q(Exists(Item.objects.all())),
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BooleanField(),
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)
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query.add_annotation(check, "_check")
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result = query.get_compiler(using=DEFAULT_DB_ALIAS).execute_sql(SINGLE)
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self.assertEqual(result[0], 1)
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def test_names_to_path_field(self):
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query = Query(None)
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query.add_annotation(Value(True), "value")
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path, final_field, targets, names = query.names_to_path(["value"], opts=None)
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self.assertEqual(path, [])
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self.assertIsInstance(final_field, BooleanField)
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self.assertEqual(len(targets), 1)
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self.assertIsInstance(targets[0], BooleanField)
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self.assertEqual(names, [])
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def test_names_to_path_field_error(self):
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query = Query(None)
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msg = "Cannot resolve keyword 'nonexistent' into field."
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with self.assertRaisesMessage(FieldError, msg):
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query.names_to_path(["nonexistent"], opts=None)
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def test_get_field_names_from_opts(self):
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self.assertEqual(get_field_names_from_opts(None), set())
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class JoinPromoterTest(SimpleTestCase):
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def test_repr(self):
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self.assertEqual(
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repr(JoinPromoter("AND", 3, True)),
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"JoinPromoter(connector='AND', num_children=3, negated=True)",
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)
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