Managing Persistence with Callbacks

Let’s come up with an approach of using callbacks to manage persistence in Mastery.

We'll cover the following

Building persistence

Let’s build our persistence solution. We will write quite a bit of code to start with, including a second Response model, but the benefits of this labor will be worth it. The second response will not be the same as the first because each response struct solves a different problem:

  • One captures user responses.

  • The other persists them to the database.

Using callbacks

We’ll manage persistence with callbacks, tweaking Mastery to take a function we’ll call when each new response is submitted. Here’s how the function will work:

  • In some solutions, perhaps with an online practice quiz, if we don’t need to save responses, that function will do nothing.

  • In others, that function will save responses to the database.

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