[1.0.x] Fixed #9508 -- Added an appropriate FileField.__hash__ implementation.

Required because we declare a custom __eq__ method.

Backport of r9997 from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.0.X@10000 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/db/models/fields/files.py

@@ -32,6 +32,10 @@ class FieldFile(File):
     def __ne__(self, other):
         return not self.__eq__(other)
 
+    def __hash__(self):
+        # Required because we defined a custom __eq__.
+        return hash(self.name)
+
     # The standard File contains most of the necessary properties, but
     # FieldFiles can be instantiated without a name, so that needs to
     # be checked for here.

tests/regressiontests/file_storage/models.py

@@ -54,6 +54,11 @@ False
 >>> p.mugshot != p1.mugshot
 True
 
+Bug #9508: Similarly to the previous test, make sure hash() works as expected
+(equal items must hash to the same value).
+>>> hash(p.mugshot) == hash(p2.mugshot)
+True
+
 # Bug #8175: correctly delete files that have been removed off the file system.
 >>> import os
 >>> p2 = Person(name="Fred")