从订阅返回时，类型“订阅”不可分配给类型“可观察”错误

Question

    setPrivileges(privilege: string): Observable<boolean> {
        if (this.loginService.privilegeList != null && this.loginService.privilegeList != undefined && this.loginService.privilegeList.getValue() != null) {
            this.privileges = this.loginService.privilegeList.getValue().filter(item => item.name === privilege);
            console.log("if this.privileges : "+this.privileges);
                return Observable.of(true);
        } else {
              return this.getUserRolesAndMenus().subscribe((result: any) => {  // line 7
               console.log("result  :"+JSON.stringify(result));
               this.privileges = result.roles.filter((element: any) => {
                    element.privileges.filter((item: any) => {
                        item.name === privilege;
                    })
                })
                console.log("esle this.privileges : "+this.privileges);
                if(this.privileges == null)
                    return Observable.of(true);
                else
                       return Observable.of(true);
            });
        }
    }

在第 7 行它抛出异常

[ts]

类型“订阅”不可分配给类型“可观察”。 “订阅”类型中缺少属性“_isScalar”。 (方法) UserService.getUserRolesAndMenus(): Observable 获取用户详细信息。 '

这里有什么问题？

/**
     * To get the user details.
     */
    getUserRolesAndMenus(): Observable<any> {
        let headers = new Headers();
        headers.append(AppUtils.HEADER_AUTHENTICATION, localStorage.getItem(AppUtils.STORAGE_ACCOUNT_TOKEN));
        return this.http.get(AppUtils.GET_USER_ROLES_AND_MENUS + AppUtils.SYSTEM_ID_IRS, { headers: headers })
            .map(response => response.json())
            .catch(this.handleError)
           /* .publishReplay(1)
            .refCount();*/
    }

Answer 1

您返回的是订阅而不是 Observable。将subscribe 更改为switchMap。这将返回一个 Observable 并将 getUserRolesAndMenus 的结果替换为您使用 Observable.of(...) 创建的 Observable