ToOne<EntityT> class
Manages a to-one relation, an unidirectional link from a "source" entity to a "target" entity. The target object is referenced by its ID, which is persisted in the source object.
You can:
- set target=null or targetId=0 to remove the relation.
- set target to an object to set the relation. Call Box<SourceEntity>.put() to persist the changes. If the target object is a new one (its ID is 0), it will be also saved automatically.
- set targetId to an existing object's ID to set the relation. Call Box<SourceEntity>.put() to persist the changes.
@Entity()
class Order {
final customer = ToOne<Customer>();
...
}
// Example 1: create a relation
final order = Order(...);
final customer = Customer();
order.customer.target = customer;
// Or you could create the target object in place:
// order.customer.target = Customer()
// attach() must be called when creating new instances. On objects (e.g.
// "orders" in this example) read with box.get() its done automatically.
order.customer.attach(store);
// saves both [customer] and [order] in the database
store.box<Order>().put(order);
// Example 2: remove a relation
order.customer.target = null
// ... or ...
order.customer.targetId = 0
Properties
- hashCode → int
-
The hash code for this object.
no setterinherited
- hasValue → bool
-
Whether the relation field has a value stored. Otherwise it's null.
no setter
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
- target ↔ EntityT?
-
Get target object. If it's the first access, this reads from DB.
getter/setter pair
- targetId ↔ int
-
Get ID of a relation target object.
getter/setter pair
Methods
-
attach(
Store store) → void -
Initializes this relation, attaching it to the
store. -
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a nonexistent method or property is accessed.
inherited
-
toString(
) → String -
A string representation of this object.
inherited
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited