Initial commit.

Signed-off-by: Chris Lamb <chris@chris-lamb.co.uk>

COPYING

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+Copyright © 2014 Chris Lamb <chris@chris-lamb.co.uk>
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above copyright
+      notice, this list of conditions and the following disclaimer in the
+      documentation and/or other materials provided with the distribution.
+    * Neither the name of the <organization> nor the
+      names of its contributors may be used to endorse or promote products
+      derived from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
+DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

README.rst

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+django-validate-model-attribute-assignment
+==========================================

django_validate_model_attribute_assignment/models.py

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+import sys
+
+from django.db import models
+from django.conf import settings
+
+FIELDS = {}
+EXCEPTIONS = {
+    'auth.User': ('backend',),
+}
+
+def setattr_validate(self, name, value):
+    super(models.Model, self).__setattr__(name, value)
+
+    # Real field names cannot start with underscores
+    if name.startswith('_'):
+        return
+
+    # Magic
+    if name == 'pk':
+        return
+
+    k = '%s.%s' % (self._meta.app_label, self._meta.object_name)
+    try:
+        fields = FIELDS[k]
+    except KeyError:
+        fields = FIELDS[k] = set(
+            getattr(x, y) for x in self._meta.fields
+            for y in ('attname', 'name')
+        )
+
+    # Field is in allowed list
+    if name in fields:
+        return
+
+    # Field is in known exceptions
+    if name in EXCEPTIONS.get(k, ()):
+        return
+
+    # Always allow Django internals to set values (eg. aggregates)
+    if 'django/db/models' in sys._getframe().f_back.f_code.co_filename:
+        return
+
+    raise ValueError(
+        "Refusing to set unknown attribute '%s' on %s instance. "
+        "(Did you misspell %s?)" % (name, k, ', '.join(fields))
+    )
+
+# Let's assume we have good test coverage
+if settings.DEBUG:
+    models.Model.__setattr__ = setattr_validate