Perform validation check on updating nested fields

[tokr-bit]

Summary

If a nested field is updated via the parent field, a validation on the nested field should be performed, if some validators are provided on the django field.

Feature Request Type

• Core functionality
• Alteration (enhancement/optimization) of existing feature(s)
• New behavior

Description

Assuming we have a Parent model with some nested fields:

class Parent(models.Model);
   foo_field = models.CharField()

class Child(models.Model):
   url = models.URLField(validators=[validators.validate_url])
   parent_field = models.ForeignKey(to=Parent, related_name="children")

We create some types and a create mutation:

@strawberry.type(Child, exclude=["parent_field"])
class Child:
    id: auto
    url: auto

@strawberry.input(Child)
class ChildInput(Child):
   pass

@strawberry.type(Parent)
class Parent:
   id: auto
   foo_field: auto
   children: List[Child]

@strawberry.input(Parent)
class ParentInput(Parent):
   pass

@strawberry.type
class Mutation:
    parent: Parent = mutations.create(types.ParentInput)

No matter which value is passed to the URL Field of the Child, the validator is not executed.

Solution

Reason is that the update_m2m method in resolvers.py does not execute a full_clean on the respective object.

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[bellini666]

Hey @tokr-bit ,

Thanks for reporting this!

I'm wondering if #394 will also fix this issue?

cc @sdobbelaere

[tokr-bit]

Hey,
#394 won't fix the issue since the update_m2m method is not changed. If you and @sdobbelaere support the feature request, I can supply a PR.

[sdobbelaere]

@tokr-bit I would appreciate this fix. I feel this would be something I'd run into myself as well during my project.

[philipstarkey]

I'm not sure if this is why the issue was left open (since #405 was meant to fix it?) but there is an additional issue even with the fix where integrity errors raised by the creation happen before the call to full_clean(), which can lead to messages like this that leak model constraint and field names

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            "locations": [
                {
                    "line": 2,
                    "column": 3
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            "path": [
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