My models.py:
SHOP1_CHOICES = (
('Food Court', 'Food Court'),
('KFC', 'KFC'),
)
SHOP2_CHOICES = (
('Sports Arena', 'Sports Arena'),
('Disco D', 'Disco D'),
)
SHOP3_CHOICES = (
('Bowling Arena', 'Bowling Arena'),
('Cinemax', 'Cinemax'),
)
class Feed(models.Model):
gender = models.CharField(max_length=5, choices=GENDER_CHOICES, default='girl')
name =models.CharField(max_length=25)
shop=models.CharField(max_length=20)
location=models.CharField(max_length=25, choices=SHOP1_CHOICES)
Here if Feed.shop == 'shop1'
I want to load SHOP1_CHOICES
on Feed.location
. Currently irrespective of what shop, it just displays the SHOP1_CHOICES
(no surprise).How can I implement it? I am stuck, please help.
Choices limits the input from the user to the particular values specified in models.py . If choices are given, they're enforced by model validation and the default form widget will be a select box with these choices instead of the standard text field.
dynamic-django-forms is a simple, reusable app that allows you to build (and respond to) dynamic forms, i.e. forms that have variable numbers and types of fields. A few examples of uses include: Building and sending out surveys. Job applications where each job might have a different application forms.
Fields in Django are the data types to store a particular type of data. For example, to store an integer, IntegerField would be used. These fields have in-built validation for a particular data type, that is you can not store “abc” in an IntegerField. Similarly, for other fields.
This is my approach:
I use lazy for lazy load:
from django.utils.functional import lazy
Here, a helper to chose options:
def help_SHOP_CHOICES():
SHOP1_CHOICES = [
('Food Court', 'Food Court'),
('KFC', 'KFC'),
]
SHOP3_CHOICES = [
('Bowling Arena', 'Bowling Arena'),
('Cinemax', 'Cinemax'),
]
return random.choice( SHOP1_CHOICES + SHOP3_CHOICES ) # choose one
Finally the model with dynamic choices:
class Feed(models.Model):
...
location=models.CharField(max_length=25, choices=SHOP1_CHOICES)
def __init__(self, *args, **kwargs):
super(Feed, self).__init__(*args, **kwargs)
self._meta.get_field('location').choices = \
lazy(help_SHOP_CHOICES,list)()
From the Django docs: http://docs.djangoproject.com/en/dev/ref/models/fields/#choices
Finally, note that choices can be any iterable object -- not necessarily a list or tuple. This lets you construct choices dynamically. But if you find yourself hacking choices to be dynamic, you're probably better off using a proper database table with a ForeignKey. choices is meant for static data that doesn't change much, if ever.
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