async def test_single_when(self):
category = Case(When(intnum__gte=8, then="big"), default="default")
sql = IntFields.all().annotate(category=category).values(
"intnum", "category").sql()
dialect = self.db.schema_generator.DIALECT
if dialect == "mysql":
expected_sql = "SELECT `intnum` `intnum`,CASE WHEN `intnum`>=8 THEN 'big' ELSE 'default' END `category` FROM `intfields`"
else:
expected_sql = 'SELECT "intnum" "intnum",CASE WHEN "intnum">=8 THEN \'big\' ELSE \'default\' END "category" FROM "intfields"'
self.assertEqual(sql, expected_sql)
async def test_q_object_when(self):
category = Case(When(Q(intnum__gt=2, intnum__lt=8), then="middle"),
default="default")
sql = IntFields.all().annotate(category=category).values(
"intnum", "category").sql()
dialect = self.db.schema_generator.DIALECT
if dialect == "mysql":
expected_sql = "SELECT `intnum` `intnum`,CASE WHEN `intnum`>2 AND `intnum`<8 THEN 'middle' ELSE 'default' END `category` FROM `intfields`"
else:
expected_sql = 'SELECT "intnum" "intnum",CASE WHEN "intnum">2 AND "intnum"<8 THEN \'middle\' ELSE \'default\' END "category" FROM "intfields"'
self.assertEqual(sql, expected_sql)
async def test_func_default(self):
category = Case(When(intnum__gte=8, then=8),
default=Coalesce("intnum_null", 10))
sql = IntFields.all().annotate(category=category).values(
"intnum", "category").sql()
dialect = self.db.schema_generator.DIALECT
if dialect == "mysql":
expected_sql = "SELECT `intnum` `intnum`,CASE WHEN `intnum`>=8 THEN 8 ELSE COALESCE(`intnum_null`,10) END `category` FROM `intfields`"
else:
expected_sql = 'SELECT "intnum" "intnum",CASE WHEN "intnum">=8 THEN 8 ELSE COALESCE("intnum_null",10) END "category" FROM "intfields"'
self.assertEqual(sql, expected_sql)
async def test_case_when_in_where(self):
category = Case(When(intnum__gte=8, then="big"),
When(intnum__lte=2, then="small"),
default="middle")
sql = (IntFields.all().annotate(category=category).filter(
category__in=["big", "small"]).values("intnum").sql())
dialect = self.db.schema_generator.DIALECT
if dialect == "mysql":
expected_sql = "SELECT `intnum` `intnum` FROM `intfields` WHERE CASE WHEN `intnum`>=8 THEN 'big' WHEN `intnum`<=2 THEN 'small' ELSE 'middle' END IN ('big','small')"
else:
expected_sql = "SELECT \"intnum\" \"intnum\" FROM \"intfields\" WHERE CASE WHEN \"intnum\">=8 THEN 'big' WHEN \"intnum\"<=2 THEN 'small' ELSE 'middle' END IN ('big','small')"
self.assertEqual(sql, expected_sql)
async def test_AE_default(self):
# AE: ArithmeticExpression
category = Case(When(intnum__gte=8, then=8), default=F("intnum") + 1)
sql = IntFields.all().annotate(category=category).values(
"intnum", "category").sql()
dialect = self.db.schema_generator.DIALECT
if dialect == "mysql":
expected_sql = "SELECT `intnum` `intnum`,CASE WHEN `intnum`>=8 THEN 8 ELSE `intnum`+1 END `category` FROM `intfields`"
else:
expected_sql = 'SELECT "intnum" "intnum",CASE WHEN "intnum">=8 THEN 8 ELSE "intnum"+1 END "category" FROM "intfields"'
self.assertEqual(sql, expected_sql)