Revert "Fixed #16211 -- Added comparison and negation ops to F() expressions"

This reverts commit 28abf5f0eb.

Conflicts:

	docs/releases/1.5.txt

django/db/backends/__init__.py

@@ -913,9 +913,6 @@ class BaseDatabaseOperations(object):
         can vary between backends (e.g., Oracle with %% and &) and between
         subexpression types (e.g., date expressions)
         """
-        if connector == 'NOT':
-            assert len(sub_expressions) == 1
-            return 'NOT (%s)' % sub_expressions[0]
         conn = ' %s ' % connector
         return conn.join(sub_expressions)
 

django/db/models/expressions.py

@@ -18,17 +18,6 @@ class ExpressionNode(tree.Node):
     AND = '&'
     OR = '|'
 
-    # Unary operator (needs special attention in combine_expression)
-    NOT = 'NOT'
-
-    # Comparison operators
-    EQ = '='
-    GE = '>='
-    GT = '>'
-    LE = '<='
-    LT = '<'
-    NE = '<>'
-
     def __init__(self, children=None, connector=None, negated=False):
         if children is not None and len(children) > 1 and connector is None:
             raise TypeError('You have to specify a connector.')
@@ -104,32 +93,6 @@ class ExpressionNode(tree.Node):
     def __ror__(self, other):
         return self._combine(other, self.OR, True)
 
-    def __invert__(self):
-        obj = ExpressionNode([self], connector=self.NOT, negated=True)
-        return obj
-
-    def __eq__(self, other):
-        return self._combine(other, self.EQ, False)
-
-    def __ge__(self, other):
-        return self._combine(other, self.GE, False)
-
-    def __gt__(self, other):
-        return self._combine(other, self.GT, False)
-
-    def __le__(self, other):
-        return self._combine(other, self.LE, False)
-
-    def __lt__(self, other):
-        return self._combine(other, self.LT, False)
-
-    def __ne__(self, other):
-        return self._combine(other, self.NE, False)
-
-    def __bool__(self):
-        raise TypeError('Boolean operators should be avoided. Use bitwise operators.')
-    __nonzero__ = __bool__
-
     def prepare_database_save(self, unused):
         return self
 

django/utils/tree.py

@@ -88,12 +88,8 @@ class Node(object):
         Otherwise, the whole tree is pushed down one level and a new root
         connector is created, connecting the existing tree and the new node.
         """
-        # Using for loop with 'is' instead of 'if node in children' so node
+        if node in self.children and conn_type == self.connector:
-        # __eq__ method doesn't get called. The __eq__ method can be overriden
+            return
-        # by subtypes, for example the F-expression.
-        for child in self.children:
-            if node is child and conn_type == self.connector:
-                return
         if len(self.children) < 2:
             self.connector = conn_type
         if self.connector == conn_type:

docs/releases/1.5.txt

@@ -177,10 +177,6 @@ Django 1.5 also includes several smaller improvements worth noting:
   :setting:`DEBUG` is `True` are sent to the console (unless you redefine the
   logger in your :setting:`LOGGING` setting).
 
-* :ref:`F() expressions <query-expressions>` now support comparison operations
-  and inversion, expanding the types of expressions that can be passed to the
-  database.
-
 * When using :class:`~django.template.RequestContext`, it is now possible to
   look up permissions by using ``{% if 'someapp.someperm' in perms %}``
   in templates.

docs/topics/db/queries.txt

@@ -640,15 +640,6 @@ that were modified more than 3 days after they were published::
     >>> from datetime import timedelta
     >>> Entry.objects.filter(mod_date__gt=F('pub_date') + timedelta(days=3))
 
-.. versionadded:: 1.5
-    Comparisons and negation operators for ``F()`` expressions
-
-Django also supports the comparison operators ``==``, ``!=``, ``<=``, ``<``,
-``>``, ``>=`` and the bitwise negation operator ``~`` (boolean ``not`` operator
-will raise ``TypeError``)::
-
-    >>> Entry.objects.filter(is_heavily_quoted=~(F('n_pingbacks') < 100))
-
 The pk lookup shortcut
 ----------------------
 

tests/modeltests/expressions/models.py

@@ -27,8 +27,6 @@ class Company(models.Model):
         Employee,
         related_name='company_point_of_contact_set',
         null=True)
-    is_large = models.BooleanField(
-        blank=True)
 
     def __str__(self):
         return self.name

tests/modeltests/expressions/tests.py

@@ -11,22 +11,22 @@ from .models import Company, Employee
 class ExpressionsTests(TestCase):
     def test_filter(self):
         Company.objects.create(
-            name="Example Inc.", num_employees=2300, num_chairs=5, is_large=False,
+            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, is_large=False,
+            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, is_large=False,
+            name="Test GmbH", num_employees=32, num_chairs=1,
             ceo=Employee.objects.create(firstname="Max", lastname="Mustermann")
         )
 
         company_query = Company.objects.values(
-            "name", "num_employees", "num_chairs", "is_large"
+            "name", "num_employees", "num_chairs"
         ).order_by(
-            "name", "num_employees", "num_chairs", "is_large"
+            "name", "num_employees", "num_chairs"
         )
 
         # We can filter for companies where the number of employees is greater
@@ -37,13 +37,11 @@ class ExpressionsTests(TestCase):
                     "num_chairs": 5,
                     "name": "Example Inc.",
                     "num_employees": 2300,
-                    "is_large": False
                 },
                 {
                     "num_chairs": 1,
                     "name": "Test GmbH",
-                    "num_employees": 32,
+                    "num_employees": 32
-                    "is_large": False
                 },
             ],
             lambda o: o
@@ -57,20 +55,17 @@ class ExpressionsTests(TestCase):
                 {
                     "num_chairs": 2300,
                     "name": "Example Inc.",
-                    "num_employees": 2300,
+                    "num_employees": 2300
-                    "is_large": False
                 },
                 {
                     "num_chairs": 3,
                     "name": "Foobar Ltd.",
-                    "num_employees": 3,
+                    "num_employees": 3
-                    "is_large": False
                 },
                 {
                     "num_chairs": 32,
                     "name": "Test GmbH",
-                    "num_employees": 32,
+                    "num_employees": 32
-                    "is_large": False
                 }
             ],
             lambda o: o
@@ -84,20 +79,17 @@ class ExpressionsTests(TestCase):
                 {
                     'num_chairs': 2302,
                     'name': 'Example Inc.',
-                    'num_employees': 2300,
+                    'num_employees': 2300
-                    'is_large': False
                 },
                 {
                     'num_chairs': 5,
                     'name': 'Foobar Ltd.',
-                    'num_employees': 3,
+                    'num_employees': 3
-                    'is_large': False
                 },
                 {
                     'num_chairs': 34,
                     'name': 'Test GmbH',
-                    'num_employees': 32,
+                    'num_employees': 32
-                    'is_large': False
                 }
             ],
             lambda o: o,
@@ -112,20 +104,17 @@ class ExpressionsTests(TestCase):
                 {
                     'num_chairs': 6900,
                     'name': 'Example Inc.',
-                    'num_employees': 2300,
+                    'num_employees': 2300
-                    'is_large': False
                 },
                 {
                     'num_chairs': 9,
                     'name': 'Foobar Ltd.',
-                    'num_employees': 3,
+                    'num_employees': 3
-                    'is_large': False
                 },
                 {
                     'num_chairs': 96,
                     'name': 'Test GmbH',
-                    'num_employees': 32,
+                    'num_employees': 32
-                    'is_large': False
                 }
             ],
             lambda o: o,
@@ -140,80 +129,21 @@ class ExpressionsTests(TestCase):
                 {
                     'num_chairs': 5294600,
                     'name': 'Example Inc.',
-                    'num_employees': 2300,
+                    'num_employees': 2300
-                    'is_large': False
                 },
                 {
                     'num_chairs': 15,
                     'name': 'Foobar Ltd.',
-                    'num_employees': 3,
+                    'num_employees': 3
-                    'is_large': False
                 },
                 {
                     'num_chairs': 1088,
                     'name': 'Test GmbH',
-                    'num_employees': 32,
+                    'num_employees': 32
-                    'is_large': False
                 }
             ],
             lambda o: o,
         )
-        # The comparison operators and the bitwise unary not can be used
-        # to assign to boolean fields
-        for expression in (
-            # Check boundaries
-            ~(F('num_employees') < 33),
-            ~(F('num_employees') <= 32),
-            (F('num_employees') > 2299),
-            (F('num_employees') >= 2300),
-            (F('num_employees') == 2300),
-            ((F('num_employees') + 1 != 4) & (32 != F('num_employees'))),
-            # Inverted argument order works too
-            (2299 < F('num_employees')),
-            (2300 <= F('num_employees'))
-        ):
-            # Test update by F-expression
-            company_query.update(
-                is_large=expression
-            )
-            # Compare results
-            self.assertQuerysetEqual(
-                company_query, [
-                    {
-                        'num_chairs': 5294600,
-                        'name': 'Example Inc.',
-                        'num_employees': 2300,
-                        'is_large': True
-                    },
-                    {
-                        'num_chairs': 15,
-                        'name': 'Foobar Ltd.',
-                        'num_employees': 3,
-                        'is_large': False
-                    },
-                    {
-                        'num_chairs': 1088,
-                        'name': 'Test GmbH',
-                        'num_employees': 32,
-                        'is_large': False
-                    }
-                ],
-                lambda o: o,
-            )
-            # Reset values
-            company_query.update(
-                is_large=False
-            )
-
-        # The python boolean operators should be avoided as they yield
-        # unexpected results
-        test_gmbh = Company.objects.get(name="Test GmbH")
-        with self.assertRaises(TypeError):
-            test_gmbh.is_large = not F('is_large')
-        with self.assertRaises(TypeError):
-            test_gmbh.is_large = F('is_large') and F('is_large')
-        with self.assertRaises(TypeError):
-            test_gmbh.is_large = F('is_large') or F('is_large')
 
         # The relation of a foreign key can become copied over to an other
         # foreign key.
@@ -272,8 +202,9 @@ class ExpressionsTests(TestCase):
         test_gmbh.point_of_contact = None
         test_gmbh.save()
         self.assertTrue(test_gmbh.point_of_contact is None)
-        with self.assertRaises(ValueError):
+        def test():
             test_gmbh.point_of_contact = F("ceo")
+        self.assertRaises(ValueError, test)
 
         test_gmbh.point_of_contact = test_gmbh.ceo
         test_gmbh.save()