How do I add a Foreign Key Field to a ModelForm in Django?

[Ram Ganesh]

it shows a drop down menu which is have mobile objects.
How to get mobile name?
confused about - self.queryset = forms.ModelChoiceField(queryset=Mobile.objects.all(label="select mob")

models.py

class Mobile(models.Model):
    name = models.CharField(max_length=50)
    price = models.DecimalField(max_digits=7,decimal_places=2)

class Agent(models.Model):
    mobile = models.ForeignKey(Mobile)
    agent_name = models.CharField(max_length=50)
........

forms.py

class MobileForm(ModelForm):
    class Meta:
        model = Mobile
   
class AgentForm(ModelForm):
    class Meta:
        model = Agent

    def __init__(self,  *args, **kwargs):
        super(AgentForm, self).__init__(*args, **kwargs)
        self.queryset = forms.ModelChoiceField(queryset=Mobile.objects.all(label="select mob")
........

views.py   

def add_agent(request):
    if request.method == 'GET':
        agent_form = AgentForm()
        return  render(request,'agentForm.html', {'agent_form':agent_form,})
 ........


in addAgentForm.html

{% if not agents_details %}
        <form action="" method="POST" enctype="multipart/form-data">
            {% csrf_token %}
            <table> {{ agent_form }} </table>
            <input type="submit" value="insert">
        </form>
    {% endif %}
........

[Tom Evans]

On Tue, Jul 8, 2014 at 3:16 PM, Ram Ganesh <ramga...@gmail.com> wrote:
>
>
> it shows a drop down menu which is have mobile objects.
> How to get mobile name?

https://docs.djangoproject.com/en/1.7/ref/forms/fields/#modelchoicefield

"""
The __str__ (__unicode__ on Python 2) method of the model will be
called to generate string representations of the objects for use in
the field’s choices; to provide customized representations, subclass
ModelChoiceField and override label_from_instance.
"""

So you can define a __unicode__ or __str__ method (python 2, python 3)
on your Mobile model, or define a sub-class of ModelChoiceField that
has a label_from_instance() method and use that instead of
ModelChoiceField.

> confused about - self.queryset =
> forms.ModelChoiceField(queryset=Mobile.objects.all(label="select mob")

Well that line is quite confusing - I guess you are trying to set the
queryset that the ModelChoiceField will use, but that is not how you
do it:

Foo.objects.all() does not take arguments.
Model forms do not use a self.queryset attribute.
For a ModelChoiceField, Foo.objects.all() is the default queryset.

I guess you want a form like this:

class AgentForm(ModelForm):
mobile = forms.ModelChoiceField(label='Select mobile')

class Meta:
model = Agent
def __init__(self, *args, **kwargs):
super(AgentForm, self).__init__(*args, **kwargs)

self.fields['mobile'].queryset = Mobile.objects.all()

As I mentioned, Foo.objects.all() is the default, so if you are happy
with that, omit the entire __init__ method.

Cheers

Tom

[Shubham Pansari]

Add the following method in your class Mobile to make it return the name of mobile object.

def __unicode__(self):

    return self.name

This will return the name whenever a mobile object is created.

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[Ram Ganesh]

Thanks for your time