Equivalent functionality to Akita's akitaPreUpdateEntity

[silellak]

Hello,

I am working on migration some Akita code, and one use case we have is an entity that has a nested entity, retrieved by a separate call. When we attempt to update the original list of entities, the nested entity gets overwritten.

We solved this in Akita using akitaPreUpdateEntity, and I'm hoping there's some way we can do so in Elf as well. Sample code is below.

Thank you!

  akitaPreUpdateEntity(bookPrev: Book, bookNew: Book) {
    if (bookPrev.bookDetails) {
      return {
        ...bookNew,
        bookDetails: bookPrev.bookDetails,
      }
    }

    return bookNew
  }``

[NetanelBasal]

If you have a books repository with an update method, you can do it there:

class BooksRepo {
  updateBooks() {
    // this is your middleware
   
    store.update(...)
  }
}

[NetanelBasal]

You can also change strategy and store the details in a separate entities state inside the same store.

https://ngneat.github.io/elf/docs/features/entities/entities-props-factory/