Django ModelForm with Select Widget - Use object.uid as default option value instead of object.id

问题

I have a form inheriting from ModelForm as such:

class ChildModel(ModelForm):
      class Meta:
          model = Documents
          fields = ('secretdocs')
          widgets = {
              'secretdocs': Select(attrs={'class': 'select'}),
          }

The model "secretdocs" has a uid. But when it prints out the select and option, the option values appear as such:

<select class="select" id="id_secretdocs" name="secretdocs">
    <option value="1">My Secret Doc</option>
</select>

But I want it to instead have the uid of the option:

<select class="select" id="id_secretdocs" name="secretdocs">
    <option value="cd2feb4a-58cc-49e7-b46e-e2702c8558fd">My Secret Doc</option>
</select>

I've so far tried to use BaseForm's data object and overwriting Select's value_from_datadict method but I'm pretty sure that wasn't the right approach. Does anyone know how I can do this?

Thanks in advance.

回答1:

You can do something like this:

class ChildModel(ModelForm):

  secretdocs = forms.ChoiceField(choices=[(doc.uid, doc.name) for doc in Document.objects.all()])
  class Meta:
      model = Documents
      fields = ('secretdocs', )
      widgets = {
          'secretdocs': Select(attrs={'class': 'select'}),
      }

回答2:

I think part of the "right" way to do this is to ensure that the UUID field is set as the primary key of the model in question and that there is no autonumber ID field.

For example:

class Document(models.Model):
    uuid = models.YourCustomUUIDField(primary_key=True,.....)
    other_field = models.CharField(.....)
    ....

If you do it this way, I think Django will pick up the UUID field as a primary key and use it in all places. If, however, you do wish to keep the built-in autoincrementing primary key field and use the UUID only here, you could do something similar to what karthikr suggests in those forms where the UUID field is required.

来源：https://stackoverflow.com/questions/15960930/django-modelform-with-select-widget-use-object-uid-as-default-option-value-ins

标签

django

django-forms

django-widget