Thanks for your post, really helped me to do the same thing in my project.
I'm not unit-testing this portion of my project so I just used the first
implementation. However I dug abit into the current source, and I believe
calling form.widget.handle_error should work.
So for your final example...
e = colander.Invalid(form.schema, 'Error message on form')
e['some_field'] = 'Error message on field'
form.error = e
form.widget.handle_error(form, e) # This is the crucial line
raise deform.exception.ValidationFailure(form, None, form.error)
On Friday, January 2, 2015 at 9:55:54 PM UTC+8, pyramidX wrote:
>
> What is the correct way to manually raise a
> deform.exception.ValidationFailure from a view, to set a particular field
> as having an invalid value? I don't want to create a custom validator
> because there are many situations where you want the application logic to
> be in the view not in a form validation function.
>
> I can set up the errors directly on the form itself, which gets the error
> messages to render to the form html.
>
> form.error = colander.Invalid(None, 'Error message on form')
> form['some_field'].error = colander.Invalid(None, 'Error message on
> field')
> raise deform.exception.ValidationFailure(form, None, form.error)
>
> But the problem is that I can't unit test this manually-thrown
> ValidationFailure in the same way as the ones thrown by deform. In other
> situations I can make assertions like the following
>
> assert len(e.error.children) == 1
> assert e.error.children[0].asdict()['some_field'] == 'Error
> message on field'
>
> But in the above case 'e.error.children' is an empty list. How do I raise
> the ValidationFailure consistently with ones thrown by deform?
>
> I can do it like the following, and everything gets set up identical to
> when deform does it (including populating the 'pos' attribute on
> colander.Invalid. However, now the errors aren't getting rendered to the
> form html.
>
> e = colander.Invalid(form.schema, 'Error message on form')
> e['some_field'] = 'Error message on field'
> raise deform.exception.ValidationFailure(form, None, e)
>
> The only way I can get it to work is like the following, now the object
> gets created correctly and it renders properly on the page. Here I am
> assigning the Invalid errors to the schema then re-assigning them to the
> correct place in the form. But this is not DRY and seems quite hack-ish.
> (Especially the 4th line, were I can't retrieve the created child Invalid
> by doing e.children['some_field'] but have to get it using the numerical
> index.) This tells me I'm probably not raising this ValidationFailure
> properly.
>
> What is the correct way to be doing this in a DRY way?
>
> e = colander.Invalid(form.schema, 'Error message on form')
> e['some_field'] = 'Error message on field'
> form.error = e
> form['some_field'].error = e.children[0]
> raise deform.exception.ValidationFailure(form, None, form.error)
>
>
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