I am using graphql as the interface. When design the schema I can't find a way to support non-nullable optional fields. For example:
mutation {
createUser (firstName: String!, lastName: String!, middleName: String): Void
}
for above mutation, I'd like to make the middlename as optional but also don't accept null value. Is it possible to do in graphql?
The graphql spec mentions that non-nullable input fields are always required.
Quoting:
If no value is provided for a defined input object field and that field definition provides a default value, the default value should be used. If no default value is provided and the input object field's type is non-null, an error should be raised. Otherwise, if the field is not required, then no entry is added to the coerced unordered map.