I'm having trouble figuring out how to print just the parent element names from the structure of my database. The image provided shows the layout, but I can't seem to isolate the parent elements successfully.
I'm having trouble figuring out how to print just the parent element names from the structure of my database. The image provided shows the layout, but I can't seem to isolate the parent elements successfully.
Think of the Firebase Database as a single JSON object.
This object follows a tree structure, where each location in the tree holds specific data.
Consider this example database:
{
"items": {
"1": {
"title": "Hi"
},
"2": {
"title": "Bye"
}
}
}
With JavaScript SDK or AngularFire, you cannot directly retrieve only the parent keys "1" and "2" under "items".
If your goal is to access just the parent keys, you must establish an index for them within the Firebase database.
{
"items": {
"1": {
"title": "Hi"
},
"2": {
"title": "Bye"
}
},
"itemKeys": {
"1": "Hi",
"2": "Bye"
}
}
You can now reference the itemKeys location and utilize $firebaseArray() or $firebaseObject().
var ref = new Firebase('<my-firebase-app>.firebaseio.com/itemKeys');
var syncArray = $firebaseArray(ref);
For maintaining consistency between separate data structures, explore the client-side fan-out feature.
isShallow=true
For those utilizing the REST API, append this to your request URL. For instance
https://api-docs.example.com/data/retrieve.json?isShallow=true
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