Actually I do to set permission to each field. A field in the form can be 
viewable and editable, only viewable, or hidden.  So if user has a 
permission to see the form, but edit some fields in the form, it gets very 
tricky especially for validation.
For example I used these statements to make readonly field :
self.fields[name].widget.attrs['disabled'] = 'disabled'
self.fields[name].widget.attrs['readonly']=True
Then the problem rises not to be able send disabled fields in the post. 

On Tuesday, March 22, 2016 at 9:31:43 AM UTC-4, bobhaugen wrote:
>
> Maybe you already know this, but you can do a lot of form tinkering in 
> __init__, like so:
>
>     def __init__(self, permissions_parameter=None, *args, **kwargs):
>         super(FormName, self).__init__(*args, **kwargs)
>         if permissions_parameter:
>             #do a bunch of form tinkering
>

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