如何Angularfire2删除（）由一些关键的价值 [英] How to Angularfire2 remove() by some key value

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.

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