Ggtcf

My Template is divided into two columns.
I have only one Model but aiming for split a form into two, one part in the first column, another part in the second column. I aim for using FormHelper for Crispy Forms.

Available Documentation gives a cryptic hint but without any examples such attempt to an explanation falls a bit short.

https://django-crispy-forms.readthedocs.io/en/d-0/tags.html#rendering-several-forms-with-helpers

Rendering several forms with helpers

Often we get asked: “How do you render two or more forms, with their
respective helpers, using % crispy % tag, without having tags
rendered twice?” Easy, you need to set form_tag helper property to
False in every helper:

self.helper.form_tag = False

Then you will have to write a little of html code surrounding the
forms:

<form action="% url submit_survey %" class="uniForm" method="post">
 % crispy first_form %
 % crispy second_form %
</form>

UPDATE: This post explains the passus of the Crispy documentation
Define crispy forms context names for two forms in one

Below is my code. The two FormHelper divide the Model into two parts, first part with fields: ['car_model_make', 'status_is_secondhand']
second part with fields: ['seller', 'buyer']

What I have been looking for is a way to "call" upon a specific % crispy form %. Given the "help" documentation" such would look as % crispy product-modelform_1 % and % crispy product-modelform_2 % which does not work.

# models.py
class Product(models.Models):
 car_model_make = models.CharField(default='B', max_length=1, blank=True, choices=CAR_TYPE)
 status_is_secondhand = models.BooleanField(blank=True)
 seller = models.CharField(max_length=50, blank=True, choices=SELLER_TYPE)
 buyer = models.CharField(max_length=50, blank=True, choices=BUYER_TYPE)

# forms.py
class ProductForm(ModelForm):
 class Meta:
 model = Product
 fields = ('__all__')

 def __init__(self, *args, **kwargs):
 super(ProductForm, self).__init__(*args, **kwargs)
 self.helper = FormHelper()
 self.helper.form_class = 'form-horizontal'
 self.helper.label_class = 'col-sm-4'
 self.helper.field_class = 'col-sm-8'
 self.helper.form_id = 'product-modelform'
 self.helper.form_tag = False


 model = 'car_model_make'
 secondhand = 'status_is_secondhand'

 self.fields[model].label = "Model"
 self.fields[secondhand].label = "Is Secondhand"

 self.helper.layout = Layout(
 Field(model),
 Field(secondhand),
 )

 def __init__(self, *args, **kwargs):
 super(ProductForm, self).__init__(*args, **kwargs)
 self.helper = FormHelper()
 self.helper.form_class = 'form-horizontal'
 self.helper.label_class = 'col-sm-4'
 self.helper.field_class = 'col-sm-8'
 self.helper.form_id = 'product-modelform'
 self.helper.form_tag = False


 seller = 'seller'
 buyer = 'buyer'

 self.fields[seller].label = "Seller"
 self.fields[buyer].label = "buyer"

 self.helper.layout = Layout(
 Field(seller),
 Field(buyer),
 )

# views.py
class ProductFormView(FormView):
 form_class = ProductForm

 def form_valid(self, form):
 form.save()
 return super().form_valid(form)

 def get_success_url(self):
 return reverse('index')

# urls.py
urlpatterns = [
 path('', index, name='index'),
 path('product/', ProductFormView.as_view(template_name='product/product.html'),


# html template

% extends "product/base.html" %
% load crispy_forms_tags %

% block col8_content %
<form id="product-modelform" method="post">
 % csrf_token %
 % crispy form %
 % endblock col8_content %
 % block col4_content % 
</form>
 % endblock col4_content %
 <input type="submit" value="Submit">

You can't have two __init__ methods and you don't need it actually. You may just enclose those two 'columns' inside two separate <div> tags with the help of FormHelper().

def __init__(self, *args, **kwargs):
 super(ProductForm, self).__init__(*args, **kwargs)
 self.helper = FormHelper()
 self.helper.form_class = 'form-horizontal'
 self.helper.label_class = 'col-sm-4'
 self.helper.field_class = 'col-sm-8'
 self.helper.form_id = 'product-modelform'
 self.helper.form_tag = False
 self.helper.layout = Layout(
 Div(
 Div('car_model_make','status_is_secondhand', css_class='col-lg-6 col-md-6 col-sm-12'),
 Div('seller','buyer', css_class='col-lg-6 col-md-6 col-sm-12'),
 css_class='row'
 )
 )

Hope, this gives you the trick. Refer Layouts for more.

This seems to work for now (mainly inspired from Define crispy forms context names for two forms in one but here I have created two new forms based upon a ModelForm): I wish I fully understood the solution better myself, but at least it works as intended.

# models.py
class Product(models.Models):
 car_model_make = models.CharField(default='B', max_length=1, blank=True, choices=CAR_TYPE)
 status_is_secondhand = models.BooleanField(blank=True)
 seller = models.CharField(max_length=50, blank=True, choices=SELLER_TYPE)
 buyer = models.CharField(max_length=50, blank=True, choices=BUYER_TYPE)

# forms.py
class ProductForm(ModelForm):
 class Meta:
 model = Product
 fields = ('__all__')

class CarForm(ProductForm):
 def __init__(self, *args, **kwargs):
 super().__init__(*args, **kwargs)
 self.helper = FormHelper()
 self.helper.form_class = 'form-horizontal'
 self.helper.label_class = 'col-sm-4'
 self.helper.field_class = 'col-sm-8'
 self.helper.form_tag = False
 self.helper.add_input(Submit('submit', 'Submit'))

 model = 'car_model_make'
 secondhand = 'status_is_secondhand'

 self.fields[model].label = "Model"
 self.fields[secondhand].label = "Is Secondhand"

 self.helper.layout = Layout(
 Field(model),
 Field(secondhand),
 )

class TransactionForm(ProductForm):
 def __init__(self, *args, **kwargs):
 super().__init__(*args, **kwargs)
 self.helper = FormHelper()
 self.helper.form_class = 'form-horizontal'
 self.helper.label_class = 'col-sm-4'
 self.helper.field_class = 'col-sm-8'
 self.helper.form_tag = False


 seller = 'seller'
 buyer = 'buyer'

 self.fields[seller].label = "Seller"
 self.fields[buyer].label = "buyer"

 self.helper.layout = Layout(
 Field(Seller),
 Field(buyer),
 )

# views.py
class ProductFormView(FormView):
 form_class = CarForm
 model = Product

 def get_context_data(self, **kwargs):
 context = super(ProductFormView, self).get_context_data(**kwargs)
 context['form_2'] = TransactionForm(instance=self.model())
 return context

 def form_valid(self, form):
 self.object = form.save()
 return HttpResponseRedirect(self.get_success_url())

 def form_invalid(self, form):
 return self.render_to_response(
 self.get_context_data(
 form=form,
 )
 )

 def get_success_url(self):
 return reverse('index')

# urls.py
urlpatterns = [
 path('', index, name='index'),
 path('product/', ProductFormView.as_view(template_name='product/product.html'),


# html template

% extends "product/base.html" %
% load crispy_forms_tags %

% block col8_content %
<form id="product-modelform" method="post">
 % csrf_token %
 % crispy form %
 % endblock col8_content %
 % block col4_content %
 % crispy form_2 %
</form>
 % endblock col4_content %