When I compile my code, I encounter the following issue (despite not finding any errors in the browser console and the application functioning properly).
An error occurs in src/app/services/product.service.ts(15,9): The type 'Observable<Product>' cannot be assigned to type 'Observable<Product[]>'.
The type 'Product' cannot be assigned to type 'Product[]'.
There is an argument mismatch in src/app/store/effects/product.effect.ts(22,76): The type 'Product[]' cannot be assigned to parameter of type 'Product'.
The type 'Product[]' does not have the 'id', 'name', and 'description' properties.
In src/app/store/effects/product.effect.ts(23,44): Expected 0 arguments, but obtained 1.
The type '(state: State, action: Action) => State | { loading: boolean; loaded: boolean; products: Product; }'
cannot be assigned to type 'ActionReducer<State, Action>'.
The type 'State | { loading: boolean; loaded: boolean; products: Product; }' does not match 'State'.
The type '{ loading: boolean; loaded: boolean; products: Product; }' does not match 'State'.
The properties 'products' of both types are not compatible.
The type 'Product' is missing properties such as length, pop, push, concat, and others from type 'Product[]'.
product.model.ts
The interface 'Product' has the following properties:
- id: number
- name: string
- description: string
product.effect
The import statements for necessary modules and services are as follows:
- Effects, Actions, ofType from '@ngrx/effects'
- map, switchMap, catchError from 'rxjs/operators'
- of from 'rxjs'
- Injectable from '@angular/core'
The class 'ProductEffects' has the following members:
- Constructor to assign values to actions$ and productService variables
- loadProducts$ method defined as an Effect: It listens for productActions.LOAD_PRODUCTS action and performs the necessary operations using productService. On success, it dispatches LoadProductsSuccess action with the retrieved products, and on failure, it dispatches LoadProductsFail action with the encountered error.
Screenshot of the application state: