Preparations for copy event feature.

dav_events/forms/generic.py

@@ -130,3 +130,15 @@ class ModelMixin(object):
             if hasattr(model, attr):
                 kwargs2[attr] = kwargs1[attr]
         return model(**kwargs2)
+
+    def load_from_instance(self, instance):
+        model = self._get_model()
+        if not isinstance(instance, model):
+            raise TypeError('Expected %s' % model.__class__.__name__)
+        self.is_bound = True
+        self.data = {}
+        self.cleaned_data = {}
+        for field in instance._meta.get_fields():
+            self.data[field.name] = getattr(instance, field.name)
+            self.cleaned_data[field.name] = getattr(instance, field.name)
+        self._post_clean()