filter foreignkey field in django admin

Question

I have these models:

class Entity(models.Model):
       name=models.CharField(max_length=100)
      
class Theme(models.Model):
   name=models.CharField(max_l         


        

Answer 1

Another option is to create a custom model form where the queryset attribute of the theme field will be fine tuned to meet your needs.

class CompanyForm(ModelForm):
    class Meta:
        model = CompanyForm
        fields = __all__ # or a tuple of fields

    def __init__(self, *args, **kwargs):
        super(CompanyForm, self).__init__(*args, **kwargs)
        if self.instance: # Editing and existing instance
            self.fields['theme'].queryset = Theme.objects.filter(name__iexact='company')

This model form can be also reused outside of the django admin area.