如何在AngularFire2中推送数组中的元素？

Question

I am trying to update array in Firebase db. Here is the Firebase user collection. I am trying to create a group and updating id in users/groups collection.

"users" : {
    "F0m0l0JhIXMhlQmEMv5ci1MapLM2" : {
      "address" : "Address 123334",
      "displayName" : "Prashant 1",
      "email" : "fireapps@gmail.com",
      "groups" : [ "-KbzjEnTCGAto8SQbvzc", "-KbzjCLP3Aw2jfa0NmHO" ],
      "name" : "Prashant",
      "phone" : "9900XXXX190"
    }
  }

I want to add new key in groups array using AngularFire2. How to update the array?

Answer 1

I suppose you are using angularefire2, so update groups node would be

...
constructor(
  private af: AngularFire,
  ) {}
...
this.af.database.object('/users/F0m0l0JhIXMhlQmEMv5ci1MapLM2').update({
    "groups": "your new key" // <--------
  })
  .catch (error =>{
    console.log(error);
});

If you want to use your own keys then:

this.af.database.object('/users/F0m0l0JhIXMhlQmEMv5ci1MapLM2/groups').update({
  "0": "group 1 key",
  "1": "group 2 key",
  "custom key": "group x key"
}).catch(error => { console.log(error); });

If you have your data in an array named updateArray , then update groups node with such array. Something likes

this.af.database.object('/users/F0m0l0JhIXMhlQmEMv5ci1MapLM2/groups').update(updateArray).catch(error =>{ console.log(error); });