Many of the objects used in Scrupal are not stored in the database. Essentially those things coming from a Module
are just retained in memory: Module, Feature, Entity, Type, Handler, etc. However, we need to reference these
things from objects that are stored in the database. We do not want to be loading the low level memory objects
all the time but would just like to "find" them. That's what the RegistryReference is for. We can register
long-lived immutable objects in a registry and find them later, by name. But, there is a registry per
object type, by design. So, we need a way to capture a reference to a named object in one of the registries. We
do that by simply caching the registry object and the registrable object's id. This information is then stored
in the database and reconstructed into the referenced object with the apply method.
This member is added by an implicit conversion from RegistryReference[T] to
any2stringadd[RegistryReference[T]] performed by method any2stringadd in scala.Predef.
This member is added by an implicit conversion from RegistryReference[T] to
ArrowAssoc[RegistryReference[T]] performed by method ArrowAssoc in scala.Predef.
This member is added by an implicit conversion from RegistryReference[T] to
Ensuring[RegistryReference[T]] performed by method Ensuring in scala.Predef.
This member is added by an implicit conversion from RegistryReference[T] to
Ensuring[RegistryReference[T]] performed by method Ensuring in scala.Predef.
This member is added by an implicit conversion from RegistryReference[T] to
Ensuring[RegistryReference[T]] performed by method Ensuring in scala.Predef.
This member is added by an implicit conversion from RegistryReference[T] to
Ensuring[RegistryReference[T]] performed by method Ensuring in scala.Predef.
This member is added by an implicit conversion from RegistryReference[T] to
StringFormat[RegistryReference[T]] performed by method StringFormat in scala.Predef.
This member is added by an implicit conversion from RegistryReference[T] to
ArrowAssoc[RegistryReference[T]] performed by method ArrowAssoc in scala.Predef.
Reference A Memory Object From The Database
Many of the objects used in Scrupal are not stored in the database. Essentially those things coming from a Module are just retained in memory: Module, Feature, Entity, Type, Handler, etc. However, we need to reference these things from objects that are stored in the database. We do not want to be loading the low level memory objects all the time but would just like to "find" them. That's what the RegistryReference is for. We can register long-lived immutable objects in a registry and find them later, by name. But, there is a registry per object type, by design. So, we need a way to capture a reference to a named object in one of the registries. We do that by simply caching the registry object and the registrable object's id. This information is then stored in the database and reconstructed into the referenced object with the apply method.