field method
Gets the binding controller for a specific field.
Returns the FieldBindingController for the specified name. Throws an
ArgumentError if no field with the given name exists.
Implementation
@override
FieldBindingController field(String name) {
if (fields.containsKey(name)) {
return fields[name]!;
} else {
throw ArgumentError('Field $name does not exist in this binding');
}
}