fetch_data and validation

[city]

Hi all,

I'm attempting to make use of your DbFormPage class to generate forms that auto-populate based on database objects.

Consider the following code:

    @expose('a_template')

    def edit(self, **kw):

        form = EditExperimentForm

        form.fetch_data(request)

        return dict(page='experiments',

                    form=form,

                    )    

    @expose()

    @validate(EditExperimentForm, error_handler=edit)

    def post_edit(self, **kw):

        ...

        transaction.commit()

        redirect('...') 

fetch_data overwites any relevant validation data, so if a user posts a form with invalid information it's immediately discarded by that method.

Granted, I can write a separate method as the error handler - but is there a simple way to determine whether or not errors have been caught by the validator? If so, I can simple put a conditional statement in there and handle whether or not I bother fetching data.

Thanks!

[Paul Johnston]

Hi,

The test you can use is:

if tw2.core.request_local().get('validated_widget'):
  # error handler
else:
  form.fetch_data(request)

DbFormPage was primarily intended for using tw2 standalone; it doesn't brilliantly integrate with Pyramid. So I've no plans to tidy this up.

Paul

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