firebase query by array of child - angularjs

Question

I have this document structure
{
"parking" : {
"-Kace9LLJBuhG1RBWsy2" : {
"address" : "avenida",
"company_name" : "Company",
"hours" : 40,
"owner" : "Fmex7wiYAsbxNFhDy39X1r28J9L2",
"receipts" : [
{
"id" : "-KbB-0Wxxx_vsCxy",
"date" : "3/01/2017",
"user_id" : "Fmex7wiYAsbxNFhDy39X1r28J9L2",
"value" : 50
},
{
"id" : "-KbB-0Wzzzz_vsCy",
"date" : "3/30/2017",
"user_id" : "Fmex7wiYAsbxNFhDy39X1r28J9L2",
"value" : 50
}
],
"social_name" : "Company",
"value" : "50"
},
Is it possible for me to pick up a parking lot, using the id of a receipt?
Example: I want to show the user a parking only if the user ID is inside the receipts array
Or do not you want to do this with the firebase and I would have to create a reference instead of a subdocument?
EDIT
I've tried something like:
var refParkingByUser = firebase.database().ref('parking').orderByChild('receipts').equalTo(Auth.$getAuth().uid);
But how do I access the receipt elements?

Answer 1

As Frank mentioned you can't do that with your data. If you add in another node that looks like this:
{
"recieptParkingLots": {
"-KbB-0Wxxx_vsCxy": {
"-Kace9LLJBuhG1RBWsy2": true
},
"-KbB-0Wzzzz_vsCy": {
"-Kace9LLJBuhG1RBWsy2": true
}
}
}
You'd easily be able to find which parking lots a receipt is attached too.
If you can only have one receipt per parking lot I'd store them outside the parking lot node:
{
"parking" : {
"-Kace9LLJBuhG1RBWsy2" : {
"address" : "avenida",
"company_name" : "Company",
"hours" : 40,
"owner" : "Fmex7wiYAsbxNFhDy39X1r28J9L2",
"receipts" : {
"-KbB-0Wxxx_vsCxy" : true,
"-KbB-0Wzzzz_vsCy" : true
}
"social_name" : "Company",
"value" : "50"
},
}
"receipts" : {
"-KbB-0Wxxx_vsCxy" : {
"parking" : "-Kace9LLJBuhG1RBWsy2",
"date" : "3/01/2017",
"user_id" : "Fmex7wiYAsbxNFhDy39X1r28J9L2",
"value" : 50
},
"-KbB-0Wzzzz_vsCy" : {
"parking" : "-Kace9LLJBuhG1RBWsy2",
"date" : "3/30/2017",
"user_id" : "Fmex7wiYAsbxNFhDy39X1r28J9L2",
"value" : 50
}
}
}
Then you can easily look up the parking lot and then go and get the receipt.