Firebase Lists versus Objects: A comparison of data structures

Seeking some clarification regarding Firebase lists.

I'm attempting to access multiple lists within a single object in order to iterate through them. The structure of the object is as follows:

user : {
    playlists: {}, // List 1
    joined: {},    // List 2
    favorites: {}  // List 3
}

While I know I can access each list individually by making three separate requests like this:

firebase.list('user/playlists');
firebase.list('user/joined');
firebase.list('user/favorites');

I am working towards optimizing my code and achieving this in a more efficient manner by using:

firebase.list('user');

And then accessing all the lists it returns inside the user object. However, the issue arises as the lists are returned without keys, only displaying "object." When I use firebase.object('user'), the keys are indeed accessible.

When requesting 'user' as a list, it looks like this:

https://i.sstatic.net/ZIAtq.png

As depicted, the key is within the object rather than outside of it ($key). How can I access these objects as if the key were the actual key (e.g., user.playlists)?

Answer №1

After some investigation, I successfully resolved the issue. Utilizing the .map() function allowed me to transform specific parts of the object into arrays.

getPlaylist(_playlistId: string, _query: Object = {}) {

  return this._database.object(`playlists/${_playlistId}`, _query).map(

      result => {

        return {
          info: result.info,
          leader: result.leader,
          favorites: (result.favorites) ? Object.values(result.favorites) : [],
          followers: (result.followers) ? Object.values(result.followers) : [],
          songs: (result.songs) ? Object.values(result.songs) : []
        };

      }

    );
  }

To illustrate, let's consider the case of converting an object called "favorites" into a list:

 Check if exists      If exists, map obj to array     else assign to empty array
(result.favorites) ? Object.values(result.favorites) : []

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