我有這兩個 http 調(diào)用：const newProject = this.newProjectForm.value;newProject.stage = "In progress";let newProjectFromServer: IProject;this.projectService.addProject(newProject).subscribe((data) => {  newProjectFromServer = data;});this.projectService  .addEmployeesToProject(    newProjectFromServer.id,    newProject.assignedEmployees   )   .subscribe(() => {     this.afterSubmit();   });第一個將項目添加到數(shù)據(jù)庫中，因此 Spring 對其應用了一個 id，因此在我作為響應獲得的數(shù)據(jù)中，它現(xiàn)在應該有一個 id。然后我嘗試添加從表單中獲得的指定員工數(shù)組。問題是 newProjectFromServer.id 參數(shù)未定義，因為我認為它是同步讀取的編輯：這是 addEmployeesToProject 函數(shù)：addEmployeesToProject(    projectId: number,    employees: IEmployee[]  ): Observable<IEmployee[]> {    return this.httpClient.post<IEmployee[]>(      `${this.baseUrl}/${projectId}/employees`,      {        _embedded: { employees },      }    );  }Api 結果：{"_embedded": {     "employees": [] // IEmployee[] array doesnt get save   },   "_links": {     "self": {      "href": "http://localhost:8080/api/projects/26/employees"     }   } }添加項目請求：addProject(project: IProject): Observable<IProject> {    return this.httpClient.post<IProject>(this.baseUrl, project);  }