如何将额外的 object 传递给 Django 表单，以便在模板中呈现一些字段？

Question

I have a form in Django where site visitors can submit "gear" to be included in a person's set of gear. Here's the URL to the change form:

# urls.py

path('person/<slug:slug>/gear/submit/', GearSubmitView.as_view(), name='forms/submit_gear'),

You can see that the person for whom the gear is being submitted is represented by a slug in the URL.

Here's the first part of the CreateView :

# views.py

class GearSubmitView(LoginRequiredMixin, CreateView):
    """Allows for third-party submissions for a pro's gear collection."""
    template_name = 'forms/submit_gear.html'
    form_class = GearSubmitForm
    success_message = 'Success: Submission added.'

And the form:

# forms.py

class GearSubmitForm(forms.ModelForm):
    class Meta:
        model = PersonProduct
        fields = ['product', 'version', 'setup_note', 'usage_start_date', 'evidence_link', 'evidence_text']

where PersonProduct is a junction table between my Person and Product models.

And the template:

# submit_gear.html

{% extends '_base.html' %}
{% load crispy_forms_tags %}

{% block content %}
    <div class="container">
        <h2 id="content-header">Submit Gear For {{ person.full_name }}</h2>
        {% crispy form %}
    </div>
{% endblock content %}

where you can see what I'm trying to do. I want to insert the name of the person represented by the slug in the URL in the form template .

How can I do it?

Answer 1

You can override get_context_data method in your views.py as mentioned in FormMixin .

class GearSubmitView(LoginRequiredMixin, CreateView):
    """Allows for third-party submissions for a pro's gear collection."""
    template_name = 'forms/submit_gear.html'
    form_class = GearSubmitForm
    success_message = 'Success: Submission added.'

    def get_context_data(self, **kwargs):
        data = super().get_context_data(**kwargs)
        person = Person.objects.filter(slug=self.kwargs.get("slug")).first()
        data['full_name'] = person.full_name if person else ""
        return data

You can change the variable name with full_name in the html file. You can also pass whole instance if you need, I just minimize the data sending from view to html. I didn't run the code block above but it should something like this.

Answer 2

Here you can use the get_context_data method inside of your createview it will look like:

def get_context_data(self, **kwargs):
   context = super().get_context_data(**kwargs)
   context['user'] = self.request.user
   return context

and on your template you will add:

{{user}}

Hope it help you out !