如何在不将 id 从 angular 应用程序传递到 ngrx/entity 的 firestore 的情况下创建项目？

Question

我正在尝试使用 Angular + Cloud Firestore + NGRX/Entity.

执行完整的 CRUD 操作

Id 是执行 ngrx/entity 所必需的参数。但是当我从我的 angular 表单创建一个项目到我的 firestore 时，我还不知道 ID，因为它会自动分配给我未来创建的文档 ID。

如何在不发送 ID 的情况下使用 ngrx/entity 将数据发送到 firestore？

我的界面如下：

实体接口：

export interface Recipe {
    id: string;
    recipeTitle: string;
}

actions.ts:

export const addRecipe = createAction(
    '[Recipe Add Component] Add Recipe',
    props<{ recipe: Recipe }>()
);

export const addRecipeSuccess = createAction(
    '[Recipe Add Effect] Add Recipe Success',
    props<{ recipe: Recipe }>()
);

export const addRecipeFailure = createAction(
    '[Recipe Add Effect] Add Recipe Failure',
    props<{ error: any }>()
);

Reducer.ts

// entity adapter
export const recipeAdapter: EntityAdapter<Recipe> = createEntityAdapter<Recipe>({
});

export interface RecipeState extends EntityState<Recipe> {
  error: any;
  selectedRecipe: Recipe;
}

export const initialState: RecipeState = recipeAdapter.getInitialState({
  error: undefined,
  selectedRecipe: undefined
});

export const recipeReducer = createReducer(
  initialState,

  on(RecipeActions.addRecipeSuccess, (state, action) => {
    return recipeAdapter.addOne(action.recipe, state);
  }),
  on(RecipeActions.addRecipeFailure, (state, action) => {
    return {
      ...state,
      error: action.error
    };
  }),

Effects.ts

  createRecipe$ = createEffect(() =>
        this.actions$.pipe(
            ofType(fromRecipeActions.addRecipe),
            mergeMap(action =>
                this.recipeService.createRecipe(action.recipe).pipe(
                    map(recipe => fromRecipeActions.addRecipeSuccess({recipe})),
                    catchError(error =>
                        of(fromRecipeActions.addRecipeFailure({ error }))
                    )
                )
            )
        )
    );

创建Component.ts


  createRecipe(formGroup): void {
    const recipeCreated = {
      recipeTitle: formGroup.recipeTitle
    };
    this.store.dispatch(actions.addRecipe({recipe: recipeCreated}));
    this.router.navigate(['tabs/recipe']);
  }

service.ts

 createRecipe(recipe): Observable<any> {
      return from(this.firestore.collection(`recipes`).add(recipe));
  }


  getRecipes(): Observable<any[]> {
    return this.firestore.collection<Recipe>('recipes').snapshotChanges().pipe(map(arr => {
      return arr.map(doc => {
        const data = doc.payload.doc.data();
        return {
          id: doc.payload.doc.id,
          ...data
        } as Recipe;
    });
  }));
}


  deleteRecipe(recipeId: string) {
    return from(this.firestore.collection<Recipe>('recipes/').doc(recipeId).delete());

  }

Answer 1

您可以创建一个自定义 ID 选择器，使 id 可选：

export const recipeAdapter: EntityAdapter<Recipe> = createEntityAdapter<Recipe>({
   selectId: t => t.id || 0
});

如何在不将 id 从 angular 应用程序传递到 ngrx/entity 的 firestore 的情况下创建项目？

How to create item without passing id from angular app to firestore with ngrx/entity?

ngrx

angular

ngrx-store

google-cloud-firestore

ngrx-entity