如何在Django的ModelForm中为模板设置自定义属性？

Question

Is it possible to write some attributes to a model field which can be used later to differentiate the different fields in the template?

model.py

from django.db import models

class Person(models.Model):
    first_name = models.CharField("i am the Label", max_length=30)
    last_name = models.CharField("i am other Label", max_length=30, customattr="Custom")

forms.py

class PersonForm(ModelForm):
    class Meta:
        Person

template.html

<form action="" method="post">{% csrf_token %}
     {% for field in form %}
         {% ifequal field.customattr 'Custom' %} # HOW COULD THIS WORK?
            <p>Hello world.</p>
            {{ field }}
         {% else %}
            <p>This is not Custom</p>
            {{ field }}
         {% endifequal %}
     {% endfor %}
 <input type="submit" value="Submit" />
 </form>

Any hints?

Answer 1

Not really possible; field in your template code is a form field, not a model field. I would shift the presentation logic from the model into the template, and do something like this:

<form action="" method="post">{% csrf_token %}
     {% for field in form %}
         {% if field.name == 'last_name' or field.name == 'another_field' %}
            <p>Hello world.</p>
            {{ field }}
         {% else %}
            <p>This is not Custom</p>
            {{ field }}
         {% endif %}
     {% endfor %}
 <input type="submit" value="Submit" />
 </form>

(the == operator was added in Django 1.2)

Answer 2

I don't understand why yo would like to do this. If you would like to define custom html to your ModelForm field you can override it like this:

class PersonForm(ModelForm):
    class Meta:
        Person
    first_name = forms.CharField(
        required = True,
        widget   = forms.TextInput(attrs={'style':'width:100px;'},
    )

Like this you can tell Django how you would like to render your html. You can find more detail in the doc https://docs.djangoproject.com/en/dev/topics/forms/modelforms/#overriding-the-default-field-types-or-widgets