Dealing with normalized data

[cjhaviland]

Previously in Akita I was able to write a query to combine the data from different stores using combineQueries. I've read through the docs, particularly the Entitites Props Factory section and I am just curious how best to handle combining stores in Elf?

I have a store that holds reference data for several other possible stores, so I don't want to add it as a Props Factory to each store. Also, it wouldn't work out if all those stores were combined into a single store with multiple entities in this case.

Currently I am doing something like this:

interface Config {
  configId: number
  typeId: number
  type: Type
}

interface Type {
  typeId: number
  typeName: string
}

configs$ = combineLatest([
    store.pipe(selectAllEntities(), shareReplay({ refCount: true })),
    this.typeRepo.types$,
  ]).pipe(
    map(([configs, types]) => {
      return configs.map(c => {
        return {
          ...c,
          type: types.find(x => x.typeId === c.typeId),
        } as Config
      })
    }),
  )

[NetanelBasal]

Are you updating both stores at the same tick?

[cjhaviland]

Both service calls run inside the ngOnInit to load the data.

[NetanelBasal]

So that's probably not on the same tick anyway. In this case, you can use combineLatest.

[cjhaviland]

Ok, thanks! Glad to hear my way of doing it works!