CODEWITHSUNDEEP
firebaseangularfire
vzhen
vzhen

Reputation: 11157

How to user FirebaseIndex with random child IDs

I have this nodes, the ref childs have randomID.

master: {
 123: {
  text: "hello world"
 },

 456: {
  text: "hello world 2"
 }
}

ref: {
 abc: {
  123: 1,
  456: 1
 },

 efg: {
  456: 1
 }
}

I want to loop the ref and it refToMaster. How to query using FirebaseIndex ?

new FirebaseIndex(ref.child(STUCK_HERE), master);

UPDATE

I updated my node structure to what hiattp and kato mentioned.

Sorry for my unclear question, I re-edit this. Actually I want to retrieve both ref.abc and ref.efg and also retrieve their related master data which are 123 and 456

Below is what I have tried.

angularFireCollection(ref, function(s) {
 s.forEach(function(cs){
  //cs.name() - So I can get abc and efg and put in FirebaseIndex
  var index = new FirebaseIndex(ref.child(cs.name()), master);
  $scope.foos = angularFireCollection(index);
  //I stuck here, must be something wrong.
 })
})

Upvotes: 0

Views: 201

Answers (2)

Kato
Kato

Reputation: 40582

@hiattp has noted the standard format for FirebaseIndex. This is the intended use case.

You can also pass a function into the dataRef for FirebaseIndex, which would allow you to deal with more sophisticated paths:

new FirebaseIndex( 
   new Firebase('URL/index'), 
   function(pathName) {
      return new Firebase('URL/data/'+pathName+'/widget');
   }
);

But as your data structure stands in the question, the keys abc and efg are completely arbitrary--not linked in any way to your master data, so I don't see what your function could do other than contain a complete map from master keys to ref paths.

Upvotes: 0

hiattp
hiattp

Reputation: 2336

In your example, abc and efg should be lists of keys (required as the first parameter in FirebaseIndex). So instead of refToMaster: "key" the format should be "key":1, where the 1 is just a placeholder. Like this:

ref: {
  abc: {
   "123":1,
   "456":1
  },
  efg: {
   "456":1
  }
}

Now new FirebaseIndex(ref.child('abc'), master) will give you both the 123 and the 456 objects in master, while new FirebaseIndex(ref.child('efg'), master) will just give you the 456 object.

Upvotes: 1

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