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The Flutter GetX Ecosystem

The Get.replace Method

Explore how to use the Get.replace method in Flutter GetX to replace existing dependencies dynamically. Understand its application with inherited classes and tagged instances through a practical example involving increment and decrement controllers controlling counter behavior across pages.

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The challenge of re-injecting dependencies in GetX

GetX is fundamentally designed so we cannot inject a dependency twice with Get.put. The code below does not work the way we expect it to be:

Dart
// Inject Controller for the first time.
Get.put<Controller>(Controller(name: 'Aachman'));
// Inject Controller again.
Get.put<Controller>(Controller(name: 'Garg'));
// Find the injected dependency.
print(Get.find<Controller>().name); // prints 'Aachman'

We’d expect that the output is 'Garg'. However, as GetX finds the dependency that was originally injected, the output is 'Aachman'.

Solving the issue with Get.replace

For scenarios like this, we have the Get.replace method. It’s a simple method that replaces the original dependency and injects a new one. Here’s what the same code would look like:

Dart
// Inject Controller for the first time.
Get.put<Controller>(Controller(name: 'Aachman'));
// Replace Controller instance.
Get.replace<Controller>(Controller(name: 'Garg'));
// Find the injected dependency.
print(Get.find<Controller>().name); // prints 'Garg'

Leveraging Get.replace with inherited classes

Internally, Get.replace deletes the previous dependency and injects the new one. This becomes tremendously helpful when we wish to use inherited classes ...