Accessing Model Data In Another Model/form

Hello i have created a simple model and now i want to access the data in another model to view it later on. My model looks like this: from django.db import models class A(models.Mo

Solution 1:

Django allows you to create class methods using @classmethod decorator. You can use that to pass data from first model into second model. Take a look at example below.

First model:

from django.db import models
class A(models.Model):
    asd = models.CharField(max_length=50,default="DEFAULT VALUE")
    def __str__(self):
        return(self.asd)

    # This is important
    @classmethod
    def get_all_choices(cls):
        # I still suggest you to go through Django documentation
        # to understand what query sets are
        return cls.objects.values_list('asd', flat=True)

Second model:

from django.db import models
from a.models import A
class B(models.Model):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.choice_array = A.get_all_choices()

    choices = models.CharField(max_length=10, choices=self.choice_array)

Please observe the comments. If you need to understand how to import A into B, refer to this question - Django : Unable to import model from another App

I have done this a couple of times but don't have the setup in hand to try. There might be some errors which you need to resolve on your own by reading the error messages.