Use variable as form fields in Django form template

Question

<here all loading of static , template_filters, crispy_forms >

<form>
{% for i in artifact_length %}
   {% with artifact_name="artifact"|artifact_name:forloop.counter0 %}
        {{form.artifact_name|as_crispy_field}}
   {% endwith %}
{%endfor%}
</form>

This is related template code. Here i want to render form fields with names artifact_0, artifact_1 as coming from form. The variable artifact_name inside with is working fine and returning expected identifiers artifact_0 , artifact_1, but i want to use these variables as form fields to render as as_crispy_field. The code {{form.artifact_name|as_crispy_field}} does not print anything because it is assuming form as field with name artifact_name which is not. Instead i want to use the value of variable here.

forms.py

  class Someform(forms.form):
    def __init__(self, artifact_obj):
        super().__init__()
        count = 0
        for artifact in artifact_obj:
            self.fields[f'artifact_{count}'] = forms.CharField(widget=forms.NumberInput())
                count += 1

tags.py

@register.filter('artifact_name')
def get_artifact_name(artifact_prefix: str, counter: int):
    print('method', 'prefix', artifact_prefix, 'counter', counter)
    return f'{artifact_prefix}_{counter}'

There is variable length form being created. As informs.py form fields are being created with artifact_count where count can range from 0 to len of obj.

Answer 1

You don't need to use filters / template tags, etc. for this purpose. The simplest solution would be to loop over the form fields to render them:

<form>
{% for field in form %}
    {{ field|as_crispy_field }}
{%endfor%}
</form>

This will loop over all the fields in your form.

If you particularly care about the order of these fields you can call the forms order_fields method:

class Someform(forms.form):
    def __init__(self, artifact_obj, *args, **kwargs):
        super().__init__(*args, **kwargs)
        for count, artifact in enumerate(artifact_obj):
            self.fields[f'artifact_{count}'] = forms.CharField(widget=forms.NumberInput())
        self.order_fields(["field_1", "field_2", ...] + [f"artifact_{i}" for i, _ in enumerate(artifact_obj)] + [..., "field_n"])

If you particularly want to render the other fields separately you can add a method to your form that will allow you to loop over these fields:

class Someform(forms.form):
    def __init__(self, artifact_obj, *args, **kwargs):
        super().__init__(*args, **kwargs)
        for count, artifact in enumerate(artifact_obj):
            self.fields[f'artifact_{count}'] = forms.CharField(widget=forms.NumberInput())
        self.artifact_length = len(artifact_obj)
    
    def artifact_fields(self):
        return [self[f'artifact_{i}'] for i in range(self.artifact_length)]

And then loop over these in the template:

<form>
{% for field in form.artifact_fields %}
    {{ field|as_crispy_field }}
{%endfor%}
</form>