Django Forms - set field values in view

Question

I have a model which represents a work order. One of the fields is a DateField and represents the date the work order was created (aptly named: dateWOCreated). When the user creates a new work order, I want this dateWOCreated field to be automatically populated with todays date and then displayed in the template. I have a few other fields that I want to set without user's intervention but should show these values to the user in the template.

I don't want to simply exclude these fields from the modelForm class because there may be a need for the user to be able to edit these values down the road.

Any help?

Thanks

Alasdair · Accepted Answer · 2014-07-31 07:51:24Z

7

When you define your model, you can set a default for each field. The default object can be a callable. For your dateWOCreated field we can use the callable date.today.

# models.py
from datetime import date

class WorkOrder(models.Model):
    ...
    dateWOCreated = models.DateField(default=date.today)

To display dates in the format MM/DD/YYYY, you need to override the widget in your model form.

from django import forms
class WorkOrderModelForm(forms.ModelForm):
    class Meta:
        model = WorkOrder
        widgets = {
            'dateWOCreated': forms.DateInput(format="%m/%d/%Y")),
        }

In forms and model forms, the analog for the default argument is initial. For other fields, you may need to dynamically calculate the initial field value in the view. I've put an example below. See the Django Docs for Dynamic Initial Values for more info.

# views.py
class WorkOrderModelForm(forms.ModelForm):
    class Meta:
        model = WorkOrder

def my_view(request, *args, **kwargs):
    other_field_inital = 'foo' # FIXME calculate the initial value here  
    form = MyModelForm(initial={'other_field': 'other_field_initial'})
    ...

edited Jul 31, 2014 at 7:51

answered May 7, 2011 at 22:38

Alasdair

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2 Comments

Garfonzo Over a year ago

Sweetness, that looks like it will work for me. However, I have a follow up question. If I use the default=date.today method, it will give a value of YYYY-MM-DD. I need to change this to MM/DD/YYYY. I tried date.today().strftime(%m\/%d\/%Y) but django does not like this. Any ideas?

Garfonzo Over a year ago

Nevermind, Django is OK with my YYYY-MM-DD formatting. Thanks!!

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