Question

我试图通过某个键（sid）值删除特定线程顺序的注释。

eComments
 0b4080bb4e686f003aaa340f8ed2e2a6
   cid: "0b4080bb4e686f003aaa340f8ed2e2a6"
   comment: "Prison Break revolves around two brothers: one ..."
   createdAt: 1487250871623
   rating: 0
   sid: "c088239a29827946f932f73c9a1d495a"
   uid: "SFmtrI0ta5PsqYkgqZuJo2"
   updatedAt: 1487250871623

4bde9de83ac2bb6d06df9876c2294483addclose
   cid: "4bde9de83ac2bb6d06df9876c2294483"
   comment: "arrives at the jail, he meets the prison denize..."
   createdAt: 1487251466761
   rating: 0
   sid: "e8c2d3c2aaf877fcdf0c103229645981"
   uid: "SFmtrI0ta5PsqYkgqZuJo2E"
   updatedAt: 1487251466761

我想删除sid: "c088239a29827946f932f73c9a1d495a" 我试过这个，但不幸的是它删除了所有的eComments数据库

const commentList = this.af.database.list('/eComments', {
      query: {
        orderByChild: 'sid',
        equalTo: sid
      }
    });
commentList.remove();

无论如何我可以按键值删除？

Answer 1

这是一种方式：

const commentList = this.af.database.list('/eComments', {
      preserveSnapshot: true,
      query: {
        orderByChild: 'sid',
        equalTo: sid
      }
    });
commentList.subscribe(snapshots=>{
    snapshots.forEach(snapshot => {
      snapshot.ref.remove();
    });
})

我不是AngularFire2专家，所以可能会有更简单/更惯用的方式。

如何通过某个键值删除Angularfire（）

1 个答案: