How can I customize my reducers using @ngrx/data?

Question

I am learning to use @ngrx/data, it is true that with that library I advance a lot of code, but I am having problems when it comes to personalizing it. I already saw how to add fields to collections

export const entityMetadata: EntityMetadataMap = { User: { additionalCollectionState: { testing: null } } };

and set the module here:

export class UsersModule {
  constructor(private eds: EntityDefinitionService) {
    eds.registerMetadataMap(entityMetadata);
  }
}

All good up there, but ..., How can I add my own reducers, in the documentation I don't see it very clearly

score 2 · Accepted Answer · answered Apr 19 '20 at 10:54

simply follow their docs how to add custom reducers: https://ngrx.io/guide/data/entity-reducer#customizing-entity-reducer-behavior

You can create a custom reducer for an entity type and register it directly with EntityCollectionReducerRegistry.registerReducer().

You can register several custom reducers at the same time by calling EntityCollectionReducerRegistry.registerReducers(reducerMap) where the reducerMap is a hash of reducers, keyed by entity-type-name.

score 0 · Answer 2 · answered Feb 01 '23 at 01:51

Maybe this helps: https://slides.com/jiali/deck-5/fullscreen#/36

ngrx/data extension points
Change built in behaviors
Customized EntityCollectionService
Customized EntityAction/Dispatcher
Add property to EntityCollection
Customized DataService
Customized merge strategy
Customized http url generator
Customized plural names
Customized persistentResultHandler
Use normal ngrx
Dispatch own action
Add own reducer/effects

How can I customize my reducers using @ngrx/data?

2 Answers2

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