Entity Service
Create service for handling data interactions with server
In our example we are creating a service for persisting entities via a simple REST API. As such, we've created a new entity.service.ts file and defined an injectable EntityService
class.
It's important that each entity service implement the IAutoEntity
interface. This interface supports the following methods:
load()
loadAll()
loadMany()
loadPage()
loadRange()
create()
createMany()
update()
updateMany()
replace()
replaceMany()
delete()
deleteMany()
These methods perform the CRUD operators for entity retrieval and persistence.
To create an entity service, we must import the IAutoEntityService
and IEntityInfo
interfaces. The entity service must implement the IAutoEntityService
interface. The IEntityInfo
object provides metadata about the entities, which can be used to help build urls if necessary.
Finally, we implement each of the necessary methods for retrieving and persisting an entities.
Your implementation may vary based on the method of persistence and the architecture of your API. Each method is optional, and may be implemented on an as-needed basis for each entity. We provide several options for loading data, as well as options for updating (PATCH) or replacing (PUT) entities. Each method of an entity service also provides additional input parameters such as custom criteria. Implement and use what you need.
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