How to get multiple values from a model field into a form choice field?-CodePudding

I have a model called Listing that has a field called categories that stores all the different categories. There is also a form with a field called categories that should show a choice field to the user, where the choices should be the values stored in the Listing.categories model field. So I tried to loop through it but that is not possible as the choice field values are stored in a dict format.

So how do I get the values from the model field into the choice field?

models.py

class Category(models.Model):
    name = models.CharField(max_length=50)


class Listing(models.Model):
    ...
    category = models.ForeignKey(Category, on_delete=models.PROTECT, null=True)

forms.py:

from .models import Listing

# example of what I was trying to do

condition_choices = (
    (1, 'New'),
    (2, 'Refurbished'),
    (3, 'Opened'),
    (4, 'Used'),
)

###

for i in Listing.category:
    category_choices = (
        (i, Listing.category)
    )


class NewListing(forms.Form):
    ...
    category = forms.ChoiceField(choices=category_choices)

CodePudding user response：

For me I have done it in this way:

Models (choice fields are in your models)

   CATEGORYCHOICES=(
    (1, 'New'),
    (2, 'Refurbished'),
    (3, 'Opened'),
    (4, 'Used'),
)
    
    class Listing(models.Model):
    ...
    categories = models.IntegerField(choices=CATEGORYCHOICES,default=0)

Then in your forms.py you will need to use "form select"

class NewListing(ModelForm):
    class Meta:
        model = Listing
        fields = ('field_name1','field_name2')
        
        labels ={
            'field_name1': '',
            'field_name2': '',
        }
        widgets = {
                    'field_name1':forms.Select(attrs={'class':'form-control'}),
                    'field_name2': forms.Select(attrs={'class':'form-control'}),
          }

Does it make sense?

You will obvioulsy need to process that data in your views.py. Let me know if you have a question, I am happy to share the code I have for this.

CodePudding user response：

If Category is a model then your condition_choices should be redundant, why use a model if those options are hardcoded? Instead of just using forms.Form, you should use a model form forms.ModelForm. You can then pass your category choices through queryset:

class ListingForm(forms.ModelForm):
   self.categories = Category.objects.all()
   super(ListingForm, self).__init__(*args, **kwargs)
   self.fields['categories'].queryset = self.categories

CodePudding user response：

You can use a ModelChoiceField in order to pass a queryset and allow the user to choose between all models in this queryset. You would then get something like :

category = forms.ModelChoiceField(queryset=Category.objects.all())