[Django]-Django: How to dynamic filter foreignkey choices by Customizing the Django_Admin

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Depends on your exact requirement and your version of Django, the answer may either setting the limit_choices_to attribute of the foreign key, or customizing the ModelAdmin form:

Using limit_choices_to

Simply limit line choices to those matching linename == 'foo'

class Record(models.Model):
    # ...
    line = models.ForeignKey(LineType, limit_choices_to={'linename': 'foo'}))

Using a custom form

If an instance exists when instantiating the form, we can select it’s domain’s service’s lines as the queryset choices

class RecordAdminForm(forms.ModelForm):
    def __init__(self, *args, **kwargs):
        super(RecordAdminForm, self).__init__(*args, **kwargs)

        # access object through self.instance...
        if self.instance:
            valid_lines = self.instance.domainname.service.line.objects.all()
            self.fields['line'].queryset = valid_lines

class RecordAdmin(admin.ModelAdmin):
    form = RecordAdminForm
    # ...

Reference SO questions:

👤tutuDajuju

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