Setup the Entities

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• Install @ngrx/entity
• Define a BookEntity interface
• Create the Entity Adapter
• Write the helper function
• Check the DevTools

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Interface

export interface IBookEntity {
  [isbn: string]: Book;
}

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Adapter

export const bookAdapter = createEntityAdapter<IBook>();

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export const array2entity = (books: IBook[], state: BooksState) => {
  return books.reduce(
    (entities: IBookEntity, book: IBook) => {
      return {
        ...entities,
        [book.isbn]: book
      };
    },
    { ...state.entities }
  );
};

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