如何Angularfire2删除（）由一些关键的价值

本文介绍了如何Angularfire2删除（）由一些关键的价值的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

e评论我试图删除某个特定线索订单的评论0b4080bb4e686f003aaa340f8ed2e2a6 cid：0b4080bb4e686f003aaa340f8ed2e2a6评论：越狱围绕着两个兄弟：一个... createdAt：1487250871623 评价：0 sid： c088239a29827946f932f73c9a1d495a uid：SFmtrI0ta5PsqYkgqZuJo2 updatedAt：1487250871623 4bde9de83ac2bb6d06df9876c2294483addclose cid：4bde9de83ac2bb6d06df9876c2294483评论：到达监狱， b $ b createdAt：1487251466761 rating：0 sid：e8c2d3c2aaf877fcdf0c103229645981 uid：SFmtrI0ta5PsqYkgqZuJo2E updatedAt：1487251466761

假设我想删除 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，我可以通过键值删除？

const commentlist = this.af.database。解决方案

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

我不是AngularFire2的专家，所以可能会有更简单/更习惯的方法。 >

I am trying to delete comments of a particular thread orderby some key(sid) value.

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

Let say I wanted to delete sid: "c088239a29827946f932f73c9a1d495a" I tried this, but unfortunately it deletes all the eComments database

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

Anyway I can delete by key value?

解决方案

This is one way:

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

I am not an AngularFire2 expert, so there might be easier/more idiomatic ways.