`AddValidationRules`

This extension allows you add custom validation rules.

See graphql.validation.rules.custom for some custom rules that can be added from GraphQl-core.

Usage example:

import strawberry
from strawberry.extensions import AddValidationRules
from graphql import ValidationRule
 
 
@strawberry.type
class Query:
    @strawberry.field
    def hello(self) -> str:
        return "Hello, world!"
 
 
class MyCustomRule(ValidationRule): ...
 
 
schema = strawberry.Schema(
    Query,
    extensions=[
        AddValidationRules(MyCustomRule),
    ],
)

API reference:

class AddValidationRules(validation_rules): ...

`validation_rules: List[Type[ASTValidationRule]]`

List of GraphQL validation rules.

More examples:

Adding a custom rule

import strawberry
from strawberry.extensions import AddValidationRules
from graphql import ValidationRule
 
 
@strawberry.type
class Query:
    @strawberry.field
    def hello(self) -> str:
        return "Hello, world!"
 
 
class CustomRule(ValidationRule):
    def enter_field(self, node, *args) -> None:
        if node.name.value == "example":
            self.report_error(GraphQLError("Can't query field 'example'"))
 
 
schema = strawberry.Schema(
    Query,
    extensions=[
        AddValidationRules([CustomRule]),
    ],
)
 
result = schema.execute_sync("{ example }")
 
assert str(result.errors[0]) == "Can't query field 'example'"

Adding the `NoDeprecatedCustomRule` from GraphQL-core

import strawberry
from strawberry.extensions import AddValidationRules
from graphql.validation import NoDeprecatedCustomRule
 
 
@strawberry.type
class Query:
    @strawberry.field
    def hello(self) -> str:
        return "Hello, world!"
 
 
schema = strawberry.Schema(
    Query,
    extensions=[
        AddValidationRules([NoDeprecatedCustomRule]),
    ],
)

Adding the `NoSchemaIntrospectionCustomRule` from GraphQL-core

import strawberry
from strawberry.extensions import AddValidationRules
from graphql.validation import NoSchemaIntrospectionCustomRule
 
 
@strawberry.type
class Query:
    @strawberry.field
    def hello(self) -> str:
        return "Hello, world!"
 
 
schema = strawberry.Schema(
    Query,
    extensions=[
        AddValidationRules([NoSchemaIntrospectionCustomRule]),
    ],
)