Ticket #5387: form-is-multipart.diff

django/newforms/forms.py

@@ -210 +210 @@
         """
         return self.cleaned_data
 
+    def is_multipart(self):
+        for field in self.fields.values():
+            if field.widget.needs_multipart_form:
+                return True
+        return False
+
 class Form(BaseForm):
     "A collection of Fields, plus their associated data."
     # This is a separate class from BaseForm in order to abstract the way

django/newforms/widgets.py

@@ -24 +24 @@
 
 class Widget(object):
     is_hidden = False          # Determines whether this corresponds to an <input type="hidden">.
+    needs_multipart_form = False
 
     def __init__(self, attrs=None):
         if attrs is not None:
@@ -120 +121 @@
 
 class FileInput(Input):
     input_type = 'file'
+    needs_multipart_form = True
 
     def render(self, name, value, attrs=None):
         return super(FileInput, self).render(name, None, attrs=attrs)