How to Override or Hide Django admin model form field value-CodePudding

Currently, I'm having a problem when overriding a form field value on my (Django==4.0.3) django admin form. The objective is : I have a specific user table that I'm connecting to AWS Cognito. And when the admin creates a new user in django, the system must create a request to create a new Cognito user. Once the Cognito user is created it generates a "sub" code, and then the sub should be saved in django

Code Follows

Model

class BuyerUser(BaseModel):
   buyer = models.ForeignKey(
       Buyer, on_delete=models.RESTRICT, related_name="%(class)s_buyer"
)
   cognito_sub = models.CharField(max_length=50)
   given_name = models.CharField(max_length=50)
   family_name = models.CharField(max_length=50)
   preferred_username = models.CharField(max_length=50)
   email = models.EmailField(blank=False)
   terms_conditions_accepted_datetime = models.DateTimeField(null=True, blank=True)

   def __str__(self):
       return self.preferred_username

admin

class BuyerUsers(admin.ModelAdmin):
   list_display = ('id', 'buyer', 'given_name', 'family_name', 'preferred_username', 'available')
   list_filter = ('buyer', 'available',)
   list_display_links = ('id', 'preferred_username',)
   search_fields = ('buyer__name', 'preferred_username', 'available')
   list_per_page = 20

   form = BuyerUserChangeForm
   add_form = BuyerUserAddForm  # It is not a native django field. I created this field and use it in get_form method.

   def get_form(self, request, obj=None, **kwargs):
       """
       Use special form during foo creation
       """
       defaults = {}
       if obj is None:
           defaults['form'] = self.add_form
       defaults.update(kwargs)
       return super().get_form(request, obj, **defaults)
   admin.site.register(BuyerUser, BuyerUsers)

and my forms

class BuyerUserAddForm(forms.ModelForm):
   grupo = forms.CharField()

   def __init__(self, data=None, files=None, auto_id='id_%s', prefix=None,
             initial=None, error_class=ErrorList, label_suffix=None,
             empty_permitted=False, instance=None, use_required_attribute=None,
             renderer=None):
      super().__init__(data, files, auto_id, prefix, initial, error_class, label_suffix, empty_permitted, instance,
                     use_required_attribute, renderer)
      self.cognito_sub = None


   def save(self, commit=True):
       grupo = self.cleaned_data.get('grupo', None)
       self.given_name = self.cleaned_data.get('given_name', None)
       self.family_name = self.cleaned_data.get('family_name', None)
       self.preferred_username = self.cleaned_data.get('preferred_username', None)
       self.email = self.cleaned_data.get('email', None)
       cognito = CognitoDriver()
       sub = cognito.parse_user(
        cognito.create_user(self.preferred_username, self.email)["User"]
    )["Sub"]

        self.cognito_sub = sub
        cognito.add_group(self.preferred_username, grupo)

        return super(BuyerUserAddForm, self).save(commit=commit)

   class Meta:
       model = BuyerUser
       # fields = '__all__'
       exclude = ['terms_conditions_accepted_datetime']


class BuyerUserChangeForm(forms.ModelForm):
    class Meta:
        model = BuyerUser
        fields = '__all__'elf.cognito_sub = sub
      cognito.add_group(self.preferred_username, grupo)

return super(BuyerUserAddForm, self).save(commit=commit)

class Meta:
    model = BuyerUser
    # fields = '__all__'
    exclude = ['terms_conditions_accepted_datetime']


class BuyerUserChangeForm(forms.ModelForm):
    class Meta:
        model = BuyerUser
        fields = '__all__'

create

Change

This cognito sub field should have its value override after cognito-user is created. as it should be happening in the following code

cognito = CognitoDriver()
sub = cognito.parse_user(
    cognito.create_user(self.preferred_username, self.email)["User"]
)["Sub"]
self.cognito_sub = sub

In fact, this cognito-user is being created and the sub is correct. the BIG PROBLEM is: this sub is not saved. It is getting only the value from the form. I've tried to hide sub field using exclude = ['cognito_sub','terms_conditions_accepted_datetime'] but only happens to save a empty value.

You may ask why I use Forms instead of simply override model.Save() method and the answer is: I need the grupo field, but this field must be persisted in DB. It only exists in Cognito.

CodePudding user response：

You have to assign the value to form.instance instead of directly to the form itself.

class BuyerUserAddForm(forms.ModelForm):
    grupo = forms.CharField()

    # ...

    def save(self, commit=True):
        grupo = self.cleaned_data.get('grupo', None)
        self.preferred_username = self.cleaned_data.get('preferred_username', None)
        self.email = self.cleaned_data.get('email', None)
        cognito = CognitoDriver()
        sub = cognito.parse_user(
        cognito.create_user(self.preferred_username, self.email)["User"])["Sub"]
        self.instance.cognito_sub = sub
        cognito.add_group(self.preferred_username, grupo)

        return super(BuyerUserAddForm, self).save(commit=commit)

You might even want to disable the input field completly using the disabled attribute. https://docs.djangoproject.com/en/4.0/ref/forms/fields/#disabled

class BuyerUserAddForm(forms.ModelForm):
    cognito_sub = forms.CharField(disabled=True)
    # ...