Django 模型的清理方法多次错误

Question

I have been playing around with my test project

I have this clean method in my model

class SomeModel(models.Model):
    f1 = models.IntegerField()
    f2 = models.IntegerField()

    def clean(self):
        if self.f1 > self.f2:
            raise ValidationError({'f1': ['Should be greater than f1',]})
        if self.f2 == 100:
            raise ValidationError({'f2': ['That's too much',]})

I don't really know how to raise both errors and show it in the admin page because even if the two if is True , only the first if error is shown(obviously) how do I show both errors?

Answer 1

You could build a dict of errors and raise a ValidationError when you are done (if necessary):

class SomeModel(models.Model):
    f1 = models.IntegerField()
    f2 = models.IntegerField()

    def clean(self):
        error_dict = {}
        if self.f1 > self.f2:
             error_dict['f1'] = ValidationError("Should be greater than f1")  # this should probably belong to f2 as well
        if self.f2 == 100:
             error_dict['f2'] = ValidationError("That's too much")
        if error_dict:
             raise ValidationError(error_dict)

Answer 2

I would expand the accepted answer by setting a classmethod like this:

@classmethod
def add_error(cls, errordict, error):
    for key, value in error.items():
        if key in errordict:
            if isinstance(errordict[key], str) or isinstance(errordict[key], ValidationError):
                errordict.update({key: [errordict[key], value]})
            elif isinstance(errordict[key], list):
                errordict[key].append(value)
        else:
            errordict.update(error)
    return errordict

That way, if a key already exists in your error dict, it will be casted in a list. That way, all the errors will be raised, even if there are multiple errors per field.

adderror(error_dict, {'field', 'error message'})