Javascript 组合可观测数据集'；不要进行HTTP调用

我有一个具有3种公共方法的服务。它们取决于

this.dossierService.dossierIds

的结果

dossierIds

是返回

BehaviorSubject

的getter

但TypeScript在所有3种方法中都给了我一个错误，即：

Type 'Observable<Observable<void>>' is not assignable to type 'Observable<void>'. Type 'Observable<void>' is not assignable to type 'void'.

类型“Observable”不可分配给类型“Observable”。类型“Observable”不可分配给类型“void”。

---

我甚至没有看到我的HTTP请求被触发。我哪里出错了？

没有进行http调用的原因是因为您没有订阅内部可观察对象

1   public deleteMortgageObligation(id: string): Observable<void> {
2     return this.getObligationsUrl(id).pipe(
3       map(dossierIds => {
4         const endpoint = `${this.getObligationsUrl(dossierIds)}/blablabla/${id}`;
5         return this.http.delete(endpoint);
6       })
7     );
8   }

---

没有进行http调用的原因是您没有订阅内部可观察对象

1   public deleteMortgageObligation(id: string): Observable<void> {
2     return this.getObligationsUrl(id).pipe(
3       map(dossierIds => {
4         const endpoint = `${this.getObligationsUrl(dossierIds)}/blablabla/${id}`;
5         return this.http.delete(endpoint);
6       })
7     );
8   }

1   public deleteMortgageObligation(id: string): Observable<void> {
2     return this.getObligationsUrl(id).pipe(
3       map(dossierIds => {
4         const endpoint = `${this.getObligationsUrl(dossierIds)}/blablabla/${id}`;
5         return this.http.delete(endpoint);
6       })
7     );
8   }

1   public deleteMortgageObligation(id: string): Observable<void> {
2     return this.getObligationsUrl(id).pipe(
3       switchMap(dossierIds => {
4         const endpoint = `${this.getObligationsUrl(dossierIds)}/blablabla/${id}`;
5         return this.http.delete(endpoint);
6       })
7     );
8   }