feature: provide path to nested field if ValidationError is raised

[tokr-bit]

Summary

This is based on the Feature Request in #398.

If a nested object is updated with a value that raises ValidationError, the field name is shown in the OperationInfo is shown that lead tot his error. It might be advantageous to see the actual nested path.

Feature Request Type

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

Description

Assume we have a parent with a nested field:

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")

with some types and mutations

@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)

Assume the following mutation:

        createParent(data: {
            fooField: "foo"
            children: [
                {
                    url: "unsupportedUrl"
                }
            ]
        }) {
            ... on OperationInfo {
                messages {
                    code
                    kind
                    field
                }
            }
        }
    }

Desired behavior: field should be Parent.children.url.
Actual behavior: field is url

Solution

Currently, we catch ValidationErrors that are raised by django in _get_validation_errors (https://github.com/strawberry-graphql/strawberry-graphql-django/blob/main/strawberry_django/mutations/fields.py#L59). We would need some kind of root parameter that allows us to backtrace this field.

Do you have any suggestions on that?

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