as_crispy_field got passed an invalid or inexistent field

Using Django Forms & APIs
1

I have an UpdateView which has extra context, ‘webrem’, added through a get_context_data() override. The problem that I have is that when I add a ‘|as_crispy_field’ tag to any of the extra context fields I get the above error.

I suspect that I need to give crispy some information about extra context fields, so that it can render them correctly, but I don’t know how. I have tried via ini but without success.

FYI the extra content is a one to one model with Webinar (the UpdateView model) as it’s primary key.

View

class WebinarUpdateView(UpdateView):
    model = Webinar
    form_class = WebinarAddForm
    template_name = 'webinar/webinar-add-update.html'
    extra_context = {'page_title': 'Edit Webinar'}

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        if self.object:
            context['webrem'] = WebinarReminder.objects.filter(webinar=self.object).first()

(the rest of the model omitted as is irrelevant)

Form

class WebinarAddForm(forms.ModelForm):
    HOURS = "HR"
    MINUTES = "MIN"
    CHOICES_INTERVAL = [
        (HOURS, 'hour(s) before'),
        (MINUTES,'minute(s) before' ),
    ]

    webinarpresenters = forms.ModelMultipleChoiceField(queryset=None)
    notifications_unit_1 = forms.ChoiceField(widget=forms.Select(attrs={'class': 'btn-light notifications_unit custom-select'}),
                                             label='',
                                             choices=CHOICES_INTERVAL,
                                             initial='MIN',
                                             required=False)
    notifications_interval_1 = forms.CharField(label='', max_length=2, required=False)
    notifications_unit_2 = forms.ChoiceField(widget=forms.Select(attrs={'class': 'btn-light notifications_unit custom-select'}),
                                             label='',
                                             choices=CHOICES_INTERVAL,
                                             initial='HR',
                                             required=False)

    notifications_interval_2 = forms.CharField(label='',
                                               max_length=2,
                                               required=False)

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.fields["webinarpresenters"].queryset = WebinarPresenter.objects.filter(is_active=True)

    class Meta:
        model = Webinar
        fields = ('title',
                  'description',
                  'webinar_event_link',
                  'webinarpresenters',
                  'notifications_unit_1',
                  'notifications_interval_1',
                  'notifications_unit_2',
                  'notifications_interval_2'
                  )

Models

class Webinar(models.Model):
    title = models.CharField(max_length=100, blank=False, null=False)
    description = models.TextField(blank=False, null=False)
    webinar_event_link = models.URLField(default="https://zoom.com", blank=False, null=True)
    webinarpresenters = models.ManyToManyField('WebinarPresenter', through='WebinarPresenting')


class WebinarReminder(models.Model):

    notifications_unit_1 = models.CharField('', max_length=3, blank=True, null=True)
    notifications_interval_1 = models.IntegerField(blank=True, null=True)
    notifications_unit_2 = models.CharField('', max_length=3, blank=True, null=True)
    notifications_interval_2 = models.IntegerField(blank=True, null=True)
    notification_time_2 = models.DateTimeField(blank=True, null=True)
    webinar = models.OneToOneField(Webinar, on_delete=models.CASCADE, primary_key=True)

The problem fields are:

‘notifications_unit_1’,
‘notifications_interval_1’,
‘notifications_unit_2’,
‘notifications_interval_2’

Traceback

[2023-06-25 08:02:44,995] ERROR: Internal Server Error: /webinar/webinar-add
Traceback (most recent call last):
  File "/Users/pj/Documents/dev/BACKOFFICE/venv/lib/python3.9/site-packages/django/core/handlers/exception.py", line 47, in inner
    response = get_response(request)
  File "/Users/pj/Documents/dev/BACKOFFICE/venv/lib/python3.9/site-packages/django/core/handlers/base.py", line 204, in _get_response
    response = response.render()
  File "/Users/pj/Documents/dev/BACKOFFICE/venv/lib/python3.9/site-packages/django/template/response.py", line 105, in render
    self.content = self.rendered_content
  File "/Users/pj/Documents/dev/BACKOFFICE/venv/lib/python3.9/site-packages/django/template/response.py", line 83, in rendered_content
    return template.render(context, self._request)
  File "/Users/pj/Documents/dev/BACKOFFICE/venv/lib/python3.9/site-packages/django/template/backends/django.py", line 61, in render
    return self.template.render(context)
  File "/Users/pj/Documents/dev/BACKOFFICE/venv/lib/python3.9/site-packages/django/template/base.py", line 170, in render
    return self._render(context)
  File "/Users/pj/Documents/dev/BACKOFFICE/venv/lib/python3.9/site-packages/django/template/base.py", line 162, in _render
    return self.nodelist.render(context)
  File "/Users/pj/Documents/dev/BACKOFFICE/venv/lib/python3.9/site-packages/django/template/base.py", line 938, in render
    bit = node.render_annotated(context)
  File "/Users/pj/Documents/dev/BACKOFFICE/venv/lib/python3.9/site-packages/django/template/base.py", line 905, in render_annotated
    return self.render(context)
  File "/Users/pj/Documents/dev/BACKOFFICE/venv/lib/python3.9/site-packages/django/template/loader_tags.py", line 150, in render
    return compiled_parent._render(context)
  File "/Users/pj/Documents/dev/BACKOFFICE/venv/lib/python3.9/site-packages/django/template/base.py", line 162, in _render
    return self.nodelist.render(context)
  File "/Users/pj/Documents/dev/BACKOFFICE/venv/lib/python3.9/site-packages/django/template/base.py", line 938, in render
    bit = node.render_annotated(context)
  File "/Users/pj/Documents/dev/BACKOFFICE/venv/lib/python3.9/site-packages/django/template/base.py", line 905, in render_annotated
    return self.render(context)
  File "/Users/pj/Documents/dev/BACKOFFICE/venv/lib/python3.9/site-packages/django/template/loader_tags.py", line 150, in render
    return compiled_parent._render(context)
  File "/Users/pj/Documents/dev/BACKOFFICE/venv/lib/python3.9/site-packages/django/template/base.py", line 162, in _render
    return self.nodelist.render(context)
  File "/Users/pj/Documents/dev/BACKOFFICE/venv/lib/python3.9/site-packages/django/template/base.py", line 938, in render
    bit = node.render_annotated(context)
  File "/Users/pj/Documents/dev/BACKOFFICE/venv/lib/python3.9/site-packages/django/template/base.py", line 905, in render_annotated
    return self.render(context)
  File "/Users/pj/Documents/dev/BACKOFFICE/venv/lib/python3.9/site-packages/django/template/loader_tags.py", line 62, in render
    result = block.nodelist.render(context)
  File "/Users/pj/Documents/dev/BACKOFFICE/venv/lib/python3.9/site-packages/django/template/base.py", line 938, in render
    bit = node.render_annotated(context)
  File "/Users/pj/Documents/dev/BACKOFFICE/venv/lib/python3.9/site-packages/django/template/base.py", line 905, in render_annotated
    return self.render(context)
  File "/Users/pj/Documents/dev/BACKOFFICE/venv/lib/python3.9/site-packages/django/template/loader_tags.py", line 62, in render
    result = block.nodelist.render(context)
  File "/Users/pj/Documents/dev/BACKOFFICE/venv/lib/python3.9/site-packages/django/template/base.py", line 938, in render
    bit = node.render_annotated(context)
  File "/Users/pj/Documents/dev/BACKOFFICE/venv/lib/python3.9/site-packages/django/template/base.py", line 905, in render_annotated
    return self.render(context)
  File "/Users/pj/Documents/dev/BACKOFFICE/venv/lib/python3.9/site-packages/django/template/base.py", line 988, in render
    output = self.filter_expression.resolve(context)
  File "/Users/pj/Documents/dev/BACKOFFICE/venv/lib/python3.9/site-packages/django/template/base.py", line 698, in resolve
    new_obj = func(obj, *arg_vals)
  File "/Users/pj/Documents/dev/BACKOFFICE/venv/lib/python3.9/site-packages/crispy_forms/templatetags/crispy_forms_filters.py", line 99, in as_crispy_field
    raise CrispyError("|as_crispy_field got passed an invalid or inexistent field")
3

You’re showing the view but not the model. Please include the model in your post.

The filter as_crispy_field is a filter for a field in a form. Your webrem context entry is an instance of a Model and is not a form field.

Also, for future reference, when you’re asking for assistance regarding an error you are receiving, please post the entire error, including the traceback.

4

Hi Ken,

You are quite right, I’ve edited the original post - thank you.

So, is there any workaround for this, so that ‘crispy’ treats it like a form and renders accordingly?

5

It’s not really clear to me what you’re trying to do here.

Crispy is designed to format forms, not instances of objects. You can create a form for that object and use crispy for it, but I’m not sure that’s what you’re looking for.

It probably would help if you posted the models involved.

6

Thank you Ken,

What I am trying to do is use UpdateView to manage two separate but connected models (the second model ‘WebinarReminder’ has a one to one relationship with Webinar).

I’ll update my post to include the models.

Thanks again.

7

Ok, that clears up a lot.

Personal recommendation - either use an FBV or create your own version of a CBV based upon the View class. The Django-provided CBVs are not really designed to work with multiple models. (Yes, you can get them to work, but it has always felt awkward to me.)

For a “link of links”, see my post at Multiple Models to one Form - #2 by KenWhitesell

In your situation here, I’d consider creating two model forms (with prefixes), one for each model. It’s probably going to be about as easy as any other method.

8

Thank you Ken,

I wasn’t aware that it was possible to integrate two model forms into the same template.

Could I trouble you for a simple example?

9

It’s very easy to integrate two model forms in the same template. The issues are working with two model forms in the same Django-provided edit CBV. (The referenced links get into the details associated with that.)