using a foreign key with multiple choices

[Christian]

Hello

I need to use a model form to create a new instance of Recette,  using multiple choices list instead of the foreign_key

class Recette(models.Model):
  ......
    categoriederecette = models.ForeignKey(Categorie, on_delete=models.CASCADE)

class Categorie(models.Model):
    SOUPE = 'SP'
    DESSERTS ='DS'
    PLATUNIQUE ='PU'
    LISTE_CHOIX =  ((SOUPE,'Soupe'), (DESSERTS,'Desserts'), (PLATUNIQUE,'Plat unique'),)
   .....
    categorierecette = models.CharField(db_column='Categorierecette', max_length=15, choices=LISTE_CHOIX, blank=True, null=True)  # Field name made lowercase....

I use a Modelform :

class RecettesForm(forms.ModelForm):
    categoriederecette = forms.ChoiceField(choices = Categorie.LISTE_CHOIX)
  
    class Meta:
        model = Recette
        fields = (...... ,'categoriederecette')

The form is displayed correctly,  but cannot be saved. In the test if form.is_valid():  I get a value error -

ValueError: Cannot assign "'SP'": "Recette.categoriederecette" must be a "Categorie" instance.

Any help would be greatly appreciated.

[amit pant]

use dict in   LISTE_CHOIX.

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[Jani Tiainen]

Well categoriederecette is a foereign key to your Categorie model. 

Your models don't make any real sense.

If your categories are fixed you can remove foreign key and add charfield and definitions directly to Recette model.

If you expect that categories are added, changed, created or deleted frequently having your current structure is okayish. Just make a name field in Categorie model as free text.

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