+
+class OverwritingFieldFile(FieldFile):
+ """
+ Deletes the old file before saving the new one.
+ """
+
+ def save(self, name, content, *args, **kwargs):
+ leave = kwargs.pop('leave', None)
+ if not leave and self and content is not self:
+ self.delete(save=False)
+ return super(OverwritingFieldFile, self).save(name, content, *args, **kwargs)
+
+
+class OverwritingFileField(models.FileField):
+ attr_class = OverwritingFieldFile
+
+
+try:
+ # check for south
+ from south.modelsinspector import add_introspection_rules
+
+ add_introspection_rules([], ["^catalogue\.fields\.JSONField"])
+ add_introspection_rules([], ["^catalogue\.fields\.OverwritingFileField"])
+except ImportError:
+ pass