尝试在NgRx中使用参数化查询但获得空结果。
这是下面的stackblitz版本代码:https://stackblitz.com/edit/ngrx-parameterized-query
减速机代码
export const userAdapter = createEntityAdapter<UserModel>({
selectId: x => x.UserId
});
export interface UserlistState extends EntityState<UserModel>{
};
export const initialState: UserlistState = userAdapter.getInitialState({
});
export function UserlistReducers(
state: UserlistState = initialState,
action: actions.UserlistActions
){
switch(action.type){
case actions.UserlistActionTypes.UPSERT_USERS:
return userAdapter.upsertMany(action.users,state);
default:
return state;
}
}
export const getUserlistState = createFeatureSelector<UserlistState>('userlist');
export const {
selectIds,
selectEntities,
selectAll,
selectTotal
} = userAdapter.getSelectors(getUserlistState);
export const getUsersByOrganizationId = createSelector(selectAll,
(users: Array<UserModel>, organization_id: number)=>{
return users.filter(x=> x.OrganizationId == organization_id)
}
)
用法
watchlist = ():Observable<UserModel[]> =>{
return this.userlistStore.select(reducers.selectAll);
}
watchlistByOrganizationId = (organization_id: number): Observable<UserModel[]> =>{
return this.userlistStore.select(reducers.getUsersByOrganizationId(organization_id));
}
你的选择器错了。
这是应该的样子; organization_id
是选择器函数的参数,因此它在函数范围内可用,无需在箭头函数参数列表中添加它。 selectAll
将返回用户并将其作为参数传递给箭头函数。以下应该按预期工作!
export const getUsersByOrganizationId = (organization_id: number) => createSelector(selectAll,
(users: Array<UserModel>) => {
return users.filter(x => x.OrganizationId == organization_id)
}
);