Sorting and Filtering Data

Firebase Realtime Database provides powerful querying capabilities, allowing developers to sort and filter data in real time. These operations are essential for efficiently managing and displaying data in Flutter applications. In this lesson, we’ll explore how to sort and filter lists in Firebase Realtime Database using Flutter with the provided data and code examples.

Sorting data

Sorting data in Firebase Realtime Database is achieved by using the orderByChild, orderByKey, or orderByValue methods. Each method provides a different way to order the data, which are as follows:

• The orderByChild method is used to sort the data based on the value of a specified child key or nested child path.

• The orderByKey method is used to sort the data by the keys of the child nodes.

• The orderByValue method is used to sort the data based on the values of the child nodes directly.

Let’s consider an example of sorting posts based on our post data. In line 12 below, we use the query parameter in the ...