CODEWITHSUNDEEP
pythondjango
Bob the Builder
Bob the Builder

Reputation: 185

How to raise multiple ValidationError in Django

I saw this post: How to raise multiple ValidationError on Django?

However I have some questions. In the accepted answer, andilabs writes:

    raise ValidationError({
    'field_name_1': ["Field not allowed to change"],
    'field_name_2': ["Field not allowed to change"],
})

Do the values have to be in a List even though it is just one string? If so, anyone know why? Or where in the documentation it says so? I have not found it in https://docs.djangoproject.com/en/3.0/ref/forms/validation/#raising-multiple-errors.

The below code works for me and in my html template I can do {{ form.user.errors }} to have it show up in a div on submission. For who wants to know what context I am using it in, I am using it in a Form view, and inside it I have a def clean(self) method, where I override the parent clean(). Some code for reference:

class RegisterForm(forms.Form):
  user = forms.CharField()
  **the fields and stuff**

  def clean(self):
    error = {}
    cleaned = super().clean()
    if 'user' not in cleaned_data:
      error['user'] = ['Username is empty']
    **check if other fields are not there, check password length minimum, etc.**
    if len(error) != 0:
      raise ValidationError(error)
    return cleaned

Upvotes: 0

Views: 1466

Answers (1)

wjh18
wjh18

Reputation: 820

From the Doctring of the __init__ method for ValidationError in django.core.exceptions:

    """
    The `message` argument can be a single error, a list of errors, or a
    dictionary that maps field names to lists of errors. What we define as
    an "error" can be either a simple string or an instance of
    ValidationError with its message attribute set, and what we define as
    list or dictionary can be an actual `list` or `dict` or an instance
    of ValidationError with its `error_list` or `error_dict` attribute set.
    """

Link to source code

Upvotes: 1

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