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Change Nullability
Alex Ald edited this page May 21, 2019
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3 revisions
This decorator allows you to modify a field's nullability on a Graphql type. A decorator for PostGraphile's makeChangeNullabilityPlugin.
Decorator takes a single parameter of type ChangeNullabilityOptions
interface ChangeNullabilityOptions {
fieldName: string;
}
We can use the ChangeNullability
decorator to allow the email field on the User
Graphql type to be null.
NOTE: This decorator usually will be paired with WrapResolver
, since the field may initially not allow nulls, but if your WrapResolver
modifies the resolver to sometimes return null, then ChangeNullability
is needed.
@SchemaType({ typeName: 'User'})
export class UserType {
@ChangeNullability({ fieldName: 'email'})
public emailNullability() {
return true;
}
}
@SchemaType({ typeName: 'User'})
export class UserType {
public constructor(private configService: ConfigurationService) {}
@ChangeNullability({ fieldName: 'email'})
public emailNullability() {
return this.configService.get('isEmailNullable');
}
}