Request DB API access to the validation information in the model

[anonymous]

In the data model, there is validation information such as character field maximum length, which is used for form entry validation in the Admin interface.

However, this doesn't seem to be available from the DB API for validation:

e.g. Using the polls/choices example;

>>> from django.models.polls import polls, choices
>>> p = polls.get_object(pk=1)
>>> p.question = 'x'*300
>>> p.save()
Traceback (most recent call last):
...
ProgrammingError: ERROR:  value too long for type character varying(200)

UPDATE polls_polls SET question='xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxK
>>>

It would be nice to have something like:

>>> polls.is_data_valid_for_field(data='x'*300, field=question)
False
>>> 

and/or

>>> polls.validation_data['question']
{'max_length':200, ... }

Perhaps this could be integrated with the Validators interface?

[anonymous]

"which is used for form entry validation in the Admin interface"

(actually, it might not be - I was just assuming. After a quick dig through the DB backends, I don't quite see how it could be explicitly checked)

[Adrian Holovaty]

This is what manipulators are for... Check out ​http://www.djangoproject.com/documentation/forms/