Fix document preview view.

mayan/apps/documents/forms.py

@@ -47,7 +47,7 @@ class DocumentPageForm(DetailForm):
 
 class DocumentPreviewForm(forms.Form):
     def __init__(self, *args, **kwargs):
-        document = kwargs.pop('document', None)
+        document = kwargs.pop('instance', None)
         super(DocumentPreviewForm, self).__init__(*args, **kwargs)
         self.fields['preview'].initial = document
         try:

mayan/apps/documents/views.py

@@ -289,6 +289,7 @@ class DocumentPageView(SimpleView):
 
 
 class DocumentPreviewView(SingleObjectDetailView):
+    form_class = DocumentPreviewForm
     model = Document
     object_permission = permission_document_view
 
@@ -301,7 +302,6 @@ class DocumentPreviewView(SingleObjectDetailView):
 
     def get_extra_context(self):
         return {
-            'form': DocumentPreviewForm(document=self.get_object()),
             'hide_labels': True,
             'object': self.get_object(),
             'title': _('Preview of document: %s') % self.get_object(),