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