On 30 oct, 14:26, Mark Wolgemuth <[EMAIL PROTECTED]> wrote:
> It seems like I'm missing something, but here's what I'm trying to do:
>
> In creating a Form object, I'm setting size limit validation
> (max_length). I'd like to recover the value for that from the
> corresponding Model's Field's max_length. So basically I want a symbol
> lookup that will inspect in the options of a field I have defined for
> a model, without having an instance of the model, just it's type.
>
> This is to avoid the 2 having to share a common separately defined
> constant, or just using an integer that I have to coordinate in both
> places, or in place of always using auto forms.
>
> eg
>
> class MyModel(Model):
> myfield = CharField(max_length=128)
>
> ------
>
> class MyForm(Form):
> myfield = CharField(max_length=**GET.FROM.MODEL**)
>
def get_model_field_option(model, field, option, default=None):
field = model._meta.get_field_by_name(field)[0]
return getattr(field, option, default)
class MyForm(Form):
myfield = CharField(
max_length=get_model_field_option(MyModel, 'myfield',
'max_length', 100)
)
Caveat : Not sure it works on all possible options for all possible
fields - testing left as an exercise to to OP !-)
HTH
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