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Lesson 15 of "Get Programming with Node.js" by Jonathan Wexler focuses on Connecting Controllers and Models, specifically utilizing promises with Mongoose.
This lesson builds upon previous concepts, where you've set up your Node.js application to handle data and store it in a MongoDB database using Mongoose models and schemas. In Lesson 15, the goal is to connect your routes to your controllers and then to these models, enabling the saving of meaningful data based on user requests.
The key steps and concepts covered in this lesson include:
Building a new controller for subscriber routes: This involves creating a dedicated controller to manage the logic related to subscriber data.
Converting routes to use JavaScript ES6-enabled promises: This enhances the flexibility and readability of your database calls, especially as your application grows and requires more complex asynchronous operations.
Connecting controllers to models: This establishes the flow of data from incoming requests, through the controller logic, and into the Mongoose models for interaction with the MongoDB database.
By the end of this lesson, you should be able to effectively link your application's routes and controllers to your Mongoose models, enabling the saving and manipulation of data within your Node.js application.

In Jonathan Wexler's book Get Programming with Node.js, Lesson 15 is titled "Connecting Controllers and Models". In this lesson, you integrate the controllers and models to save data from user requests to the MongoDB database.
The key takeaways from Lesson 15 include:
Building a controller for subscriber routes: You will learn to create a dedicated controller to handle the logic for subscriber-related requests.
Using Mongoose promises: You will convert database calls to use JavaScript ES6-enabled promises, which provides more flexibility for handling asynchronous operations.
Example code from the lesson
While the full lesson content is in the book, the GitHub repository for Get Programming with Node.js provides the code samples for each chapter. To follow along, you would likely be working with the code in the unit_3 folder, as this is where Lesson 15 is located.
A simplified example based on the lesson's goal might look like this:
1. subscribersController.js
This controller file would contain functions for handling subscriber-related actions, such as saving a new subscriber.