Python – django model Form. Include fields from related models

djangodjango-formspython

I have a model, called Student, which has some fields, and a OneToOne relationship with a user (django.contrib.auth.User).

class Student(models.Model):

    phone = models.CharField(max_length = 25 )
    birthdate = models.DateField(null=True) 
    gender = models.CharField(max_length=1,choices = GENDER_CHOICES) 
    city = models.CharField(max_length = 50)
    personalInfo = models.TextField()
    user = models.OneToOneField(User,unique=True)

Then, I have a ModelForm for that model

class StudentForm (forms.ModelForm):
    class Meta:
        model = Student

Using the fields attribute in class Meta, I've managed to show only some fields in a template. However, can I indicate which user fields to show?

Something as:

   fields =('personalInfo','user.username')

is currently not showing anything. Works with only StudentFields though/

Thanks in advance.

Best Answer

A common practice is to use 2 forms to achieve your goal.

  • A form for the User Model:

    class UserForm(forms.ModelForm):
    ... Do stuff if necessary ...
    class Meta:
        model = User
        fields = ('the_fields', 'you_want')

  • A form for the Student Model:

    class StudentForm (forms.ModelForm):
    ... Do other stuff if necessary ...
    class Meta:
        model = Student
        fields = ('the_fields', 'you_want')

  • Use both those forms in your view (example of usage):

    def register(request):
    if request.method == 'POST':
        user_form = UserForm(request.POST)
        student_form = StudentForm(request.POST)
        if user_form.is_valid() and student_form.is_valid():
            user_form.save()
            student_form.save()

  • Render the forms together in your template:

    <form action="." method="post">
    {% csrf_token %}
    {{ user_form.as_p }}
    {{ student_form.as_p }}
    <input type="submit" value="Submit">
</form>

Another option would be for you to change the relationship from OneToOne to ForeignKey (this completely depends on you and I just mention it, not recommend it) and use the inline_formsets to achieve the desired outcome.

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