form = ContactForm(request.POST)
# how to change form fields' values here?
if form.is_valid():
message = form.cleaned_data['message']
Is there a good way to trim whitespace, modify some/all fields etc before validating data?
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3 Answers
36
You should make request.POST(instance of QueryDict) mutable by calling copy on it and then change values:
post = request.POST.copy() # to make it mutable
post['field'] = value
# or set several values from dict
post.update({'postvar': 'some_value', 'var': 'value'})
# or set list
post.setlist('list_var', ['some_value', 'other_value']))
# and update original POST in the end
request.POST = post
QueryDict docs - Request and response objects
ndpu
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1That's what I've been looking for hours, thank you very much! – Bob Mar 05 '14 at 22:49
5
You could also try using request.query_params.
First, set the
_mutableproperty of thequery_paramstoTrue.Change all the parameters you want.
request.query_params._mutable = True request.query_params['foo'] = 'foo'
The advantage here is you can avoid the overhead of using request.POST.copy().
scriptmonster
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Govind S Menokee
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1That's a feature of the [Django REST framework](http://www.django-rest-framework.org/api-guide/requests/#query_params). It doesn't ship with Django itself. – yofee Mar 31 '17 at 16:50
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1django has `request.POST._mutable` with the same functionality – Antony Hatchkins Jun 12 '20 at 13:10
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1Anyone with privileges, please correct the typo. `request.quer_params['foo'] = 'foo'` to `request.query_params['foo'] = 'foo'` – mitsu Mar 10 '22 at 03:47
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1
0
You can do the following (as suggested by Antony Hatchkins)
If using DRF
request.data._mutable = True
request.data['key'] = value
In Django
request.POST._mutable = True
request.POST['key'] = value
DragonFire
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