Within my Ionic application, I am utilizing Firebase to access the data of all registered drivers. The structure of my schema is as follows;
ehara
Driver
fjk59KJjkfkjflhghk
driverId: 1
location
0: 9.086333699999999
1: 7.459455999999999
The query that arises is; how can I effectively retrieve the location of a driver if I only have their driverId?
To locate the drivers with the specified ID, you will need to execute a query:
firebase.database().ref('Driver')
.orderByChid('driverId')
.equalTo('1')
.once('value')
.then(function(snapshot) {
snapshot.forEach(function(driverSnapshot) {
console.log(driverSnapshot.val());
});
})
A query may return multiple child nodes, hence the use of snapshot.forEach to handle potentially varied results.
If the ID is unique in your scenario, it is recommended to utilize that as the key in your Driver node.
Driver
id1
location
0: 9.086333699999999
1: 7.459455999999999
In this setup, the retrieval becomes a straightforward lookup (instead of a query):
firebase.database().ref('Driver')
.child('id1')
.once('value')
.then(function(snapshot) {
console.log(snapshot.val());
})
As there can only exist one node corresponding to a specific key in this structure, the forEach loop is no longer necessary.
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