How to check if Django ValidationError subclass was raised?

Let's assume I have a Django model:

class MyDjangoModel(models.Model):

    name = models.CharField(max_length=200)

    attribute = models.IntegerField()



    class CustomValidationError(ValidationError):

        pass



    def clean(self):

        if self.attribute < 1:

            raise CustomValidationError("Attribute should be > 1!")



        if len(self.name) > 20:

            raise ValidationError("Name too long!")

I would like to create model instance and validate it:

inst = MyDjangoModel(name="Foo", attribute=0)

try:

    inst.full_clean()

except CustomValidationError:

    print("Hello!")

except ValidationError:

    print("Bye!")

But the code above will never print "Hello!" because full_clean method is raising only ValidationError.

Can anyone suggest, how to call full_clean and check if ValidationError subclass exception was raised?

edited Nov 21 '18 at 17:21

asked Nov 21 '18 at 17:14

y_v

135

A simple except ValidationError will handle all instances of subclasses as well.

– schwobaseggl
Nov 21 '18 at 17:18

@schwobaseggl yes, thank You, but I would like to add custom logic when subclass of ValidationError is raised.

– y_v
Nov 21 '18 at 17:22

The underlying exceptions are collected in the full_clean and still accessible. See the answer.

– schwobaseggl
Nov 21 '18 at 17:39

add a comment |

Let's assume I have a Django model:

class MyDjangoModel(models.Model):

    name = models.CharField(max_length=200)

    attribute = models.IntegerField()



    class CustomValidationError(ValidationError):

        pass



    def clean(self):

        if self.attribute < 1:

            raise CustomValidationError("Attribute should be > 1!")



        if len(self.name) > 20:

            raise ValidationError("Name too long!")

I would like to create model instance and validate it:

inst = MyDjangoModel(name="Foo", attribute=0)

try:

    inst.full_clean()

except CustomValidationError:

    print("Hello!")

except ValidationError:

    print("Bye!")

But the code above will never print "Hello!" because full_clean method is raising only ValidationError.

Can anyone suggest, how to call full_clean and check if ValidationError subclass exception was raised?

edited Nov 21 '18 at 17:21

asked Nov 21 '18 at 17:14

y_v

135

A simple except ValidationError will handle all instances of subclasses as well.

– schwobaseggl
Nov 21 '18 at 17:18

@schwobaseggl yes, thank You, but I would like to add custom logic when subclass of ValidationError is raised.

– y_v
Nov 21 '18 at 17:22

The underlying exceptions are collected in the full_clean and still accessible. See the answer.

– schwobaseggl
Nov 21 '18 at 17:39

add a comment |

Let's assume I have a Django model:

class MyDjangoModel(models.Model):

    name = models.CharField(max_length=200)

    attribute = models.IntegerField()



    class CustomValidationError(ValidationError):

        pass



    def clean(self):

        if self.attribute < 1:

            raise CustomValidationError("Attribute should be > 1!")



        if len(self.name) > 20:

            raise ValidationError("Name too long!")

I would like to create model instance and validate it:

inst = MyDjangoModel(name="Foo", attribute=0)

try:

    inst.full_clean()

except CustomValidationError:

    print("Hello!")

except ValidationError:

    print("Bye!")

But the code above will never print "Hello!" because full_clean method is raising only ValidationError.

Can anyone suggest, how to call full_clean and check if ValidationError subclass exception was raised?

edited Nov 21 '18 at 17:21

asked Nov 21 '18 at 17:14

y_v

135

Let's assume I have a Django model:

class MyDjangoModel(models.Model):

    name = models.CharField(max_length=200)

    attribute = models.IntegerField()



    class CustomValidationError(ValidationError):

        pass



    def clean(self):

        if self.attribute < 1:

            raise CustomValidationError("Attribute should be > 1!")



        if len(self.name) > 20:

            raise ValidationError("Name too long!")

I would like to create model instance and validate it:

inst = MyDjangoModel(name="Foo", attribute=0)

try:

    inst.full_clean()

except CustomValidationError:

    print("Hello!")

except ValidationError:

    print("Bye!")

But the code above will never print "Hello!" because full_clean method is raising only ValidationError.

Can anyone suggest, how to call full_clean and check if ValidationError subclass exception was raised?

python django python-2.7 django-1.6

edited Nov 21 '18 at 17:21

asked Nov 21 '18 at 17:14

y_v

135

edited Nov 21 '18 at 17:21

asked Nov 21 '18 at 17:14

y_v

135

edited Nov 21 '18 at 17:21

asked Nov 21 '18 at 17:14

y_v

135

asked Nov 21 '18 at 17:14

y_v

135

asked Nov 21 '18 at 17:14

y_v

135

A simple except ValidationError will handle all instances of subclasses as well.

– schwobaseggl
Nov 21 '18 at 17:18

@schwobaseggl yes, thank You, but I would like to add custom logic when subclass of ValidationError is raised.

– y_v
Nov 21 '18 at 17:22

The underlying exceptions are collected in the full_clean and still accessible. See the answer.

– schwobaseggl
Nov 21 '18 at 17:39

add a comment |

A simple except ValidationError will handle all instances of subclasses as well.

– schwobaseggl
Nov 21 '18 at 17:18

@schwobaseggl yes, thank You, but I would like to add custom logic when subclass of ValidationError is raised.

– y_v
Nov 21 '18 at 17:22

The underlying exceptions are collected in the full_clean and still accessible. See the answer.

– schwobaseggl
Nov 21 '18 at 17:39

A simple except ValidationError will handle all instances of subclasses as well.

– schwobaseggl
Nov 21 '18 at 17:18

@schwobaseggl yes, thank You, but I would like to add custom logic when subclass of ValidationError is raised.

– y_v
Nov 21 '18 at 17:22

The underlying exceptions are collected in the full_clean and still accessible. See the answer.

– schwobaseggl
Nov 21 '18 at 17:39

add a comment |

1 Answer
1

active

oldest

votes

The full_clean method collects all the errors raised on several phases.

You can check how it's calling your clean method here: https://github.com/django/django/blob/master/django/db/models/base.py#L1150

Luckily, the original exceptions are preserved inside error_dict.

You can try this:

inst = MyDjangoModel(name="Foo", attribute=0)

try:

    inst.full_clean()

except ValidationError as exc:

    for original_exc in exc.error_dict['__all__']:

        if isinstance(original_exc, MyDjangoModel.CustomValidationError):

            print("Hello!")

        elif isinstance(original_exc, ValidationError):

            print("Bye!")

Assuming that CustomValidationError is only raised from the clean method. Otherwise you would also need to check other keys in error_dict.

Note that the order of the ifs is important: the second one would also be True if the first one is True.

answered Nov 21 '18 at 17:35

JoseKilo

1,062714

add a comment |

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1 Answer
1

active

oldest

votes

1 Answer
1

active

oldest

votes

The full_clean method collects all the errors raised on several phases.

You can check how it's calling your clean method here: https://github.com/django/django/blob/master/django/db/models/base.py#L1150

Luckily, the original exceptions are preserved inside error_dict.

You can try this:

inst = MyDjangoModel(name="Foo", attribute=0)

try:

    inst.full_clean()

except ValidationError as exc:

    for original_exc in exc.error_dict['__all__']:

        if isinstance(original_exc, MyDjangoModel.CustomValidationError):

            print("Hello!")

        elif isinstance(original_exc, ValidationError):

            print("Bye!")

Assuming that CustomValidationError is only raised from the clean method. Otherwise you would also need to check other keys in error_dict.

Note that the order of the ifs is important: the second one would also be True if the first one is True.

answered Nov 21 '18 at 17:35

JoseKilo

1,062714

add a comment |

The full_clean method collects all the errors raised on several phases.

You can check how it's calling your clean method here: https://github.com/django/django/blob/master/django/db/models/base.py#L1150

Luckily, the original exceptions are preserved inside error_dict.

You can try this:

inst = MyDjangoModel(name="Foo", attribute=0)

try:

    inst.full_clean()

except ValidationError as exc:

    for original_exc in exc.error_dict['__all__']:

        if isinstance(original_exc, MyDjangoModel.CustomValidationError):

            print("Hello!")

        elif isinstance(original_exc, ValidationError):

            print("Bye!")

Assuming that CustomValidationError is only raised from the clean method. Otherwise you would also need to check other keys in error_dict.

Note that the order of the ifs is important: the second one would also be True if the first one is True.

answered Nov 21 '18 at 17:35

JoseKilo

1,062714

add a comment |

The full_clean method collects all the errors raised on several phases.

You can check how it's calling your clean method here: https://github.com/django/django/blob/master/django/db/models/base.py#L1150

Luckily, the original exceptions are preserved inside error_dict.

You can try this:

inst = MyDjangoModel(name="Foo", attribute=0)

try:

    inst.full_clean()

except ValidationError as exc:

    for original_exc in exc.error_dict['__all__']:

        if isinstance(original_exc, MyDjangoModel.CustomValidationError):

            print("Hello!")

        elif isinstance(original_exc, ValidationError):

            print("Bye!")

Assuming that CustomValidationError is only raised from the clean method. Otherwise you would also need to check other keys in error_dict.

Note that the order of the ifs is important: the second one would also be True if the first one is True.

answered Nov 21 '18 at 17:35

JoseKilo

1,062714

The full_clean method collects all the errors raised on several phases.

You can check how it's calling your clean method here: https://github.com/django/django/blob/master/django/db/models/base.py#L1150

Luckily, the original exceptions are preserved inside error_dict.

You can try this:

inst = MyDjangoModel(name="Foo", attribute=0)

try:

    inst.full_clean()

except ValidationError as exc:

    for original_exc in exc.error_dict['__all__']:

        if isinstance(original_exc, MyDjangoModel.CustomValidationError):

            print("Hello!")

        elif isinstance(original_exc, ValidationError):

            print("Bye!")

Assuming that CustomValidationError is only raised from the clean method. Otherwise you would also need to check other keys in error_dict.

Note that the order of the ifs is important: the second one would also be True if the first one is True.

answered Nov 21 '18 at 17:35

JoseKilo

1,062714

answered Nov 21 '18 at 17:35

JoseKilo

1,062714

answered Nov 21 '18 at 17:35

JoseKilo

1,062714

answered Nov 21 '18 at 17:35

JoseKilo

1,062714

add a comment |

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