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06-selectors #6

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19 changes: 17 additions & 2 deletions src/app/shared/state/books.reducer.ts
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Original file line number Diff line number Diff line change
@@ -1,5 +1,8 @@
import { createReducer, on, Action } from "@ngrx/store";
import { BookModel } from "src/app/shared/models/book.model";
import { createReducer, on, Action, createSelector } from "@ngrx/store";
import {
BookModel,
calculateBooksGrossEarnings
} from "src/app/shared/models/book.model";
import { BooksPageActions, BooksApiActions } from "src/app/books/actions";

const createBook = (books: BookModel[], book: BookModel) => [...books, book];
Expand Down Expand Up @@ -63,3 +66,15 @@ export const booksReducer = createReducer(
export function reducer(state: State | undefined, action: Action) {
return booksReducer(state, action);
}

export const selectAll = (state: State) => state.collection;
export const selectActiveBookId = (state: State) => state.activeBookId;
export const selectActiveBook = createSelector(
selectAll,
selectActiveBookId,
(books, activeBookId) => books.find(book => book.id === activeBookId) || null
);
export const selectEarningsTotals = createSelector(
selectAll,
calculateBooksGrossEarnings
);