identifyProperty<T, U extends ManagedObject> method Null safety

KeyPath identifyProperty<T, U extends ManagedObject>(
  1. T propertyIdentifier(
    1. U? x
    )
)

Returns a property selected by propertyIdentifier.

Invokes identifyProperties with propertyIdentifier, and ensures that a single property on this entity was selected. Returns that property.

Implementation

KeyPath identifyProperty<T, U extends ManagedObject>(
    T propertyIdentifier(U? x)) {
  final properties = identifyProperties(propertyIdentifier);
  if (properties.length != 1) {
    throw ArgumentError(
        "Invalid property selector. Must reference a single property only.");
  }

  return properties.first;
}