What is the method for implementing an 'AND' condition in Firebase or its equivalent?

I have a query requirement where I am looking to display only specific data by using an 'AND' statement or its equivalent. To better explain, I am referencing the example given in the Firebase Documentation.

// Find all dinosaurs whose height is exactly 25 meters.
var ref = firebase.database().ref("dinosaurs");
ref.orderByChild("height").equalTo(25).on("child_added", function(snapshot)    {
console.log(snapshot.key);
});

While this line successfully retrieves all dinosaurs with a height of 25, my goal is to show dinosaurs with a height of '25' AND a name of 'Dino'. Is there a way to achieve this specific information retrieval?

I appreciate any assistance provided.

javascriptangularjsfirebasefirebase-realtime-database

Answer №1

In Firebase, filtering and ordering are limited to one property. However, if you need to filter by multiple properties, such as both age and name, you can utilize composite keys.

For more advanced multi-property filtering capabilities, consider using the third-party library querybase. Check it out at https://github.com/davideast/Querybase

Answer №2

It is not possible to query using multiple keys simultaneously. If you need to sort by two properties, here are a couple of options:

  1. Create a hybrid key. For example, if you want to retrieve all items with the name 'Dino' and height '25', you can create a hybrid key like Dino_25. Although this allows you to search for items with exact values, it limits your ability to order them based on age criteria.
  2. Execute one query on Firebase and another on the client side. First, query by name on Firebase and then filter the results on the client side to only keep those matching age 25.

Based on your schema structure, make sure you have flattened your data enough. Sometimes reevaluating how data is stored can simplify complex queries significantly. However, there may be cases where you will still need to choose from the solutions mentioned above.

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