Solving the cb is not a function Error in MongoDB Queries with Sails.js

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The Problem

The Setup

The hierarchy of functions looked something like this:

fun1(cb): The first function responsible for establishing the connection.

return cb(null, results): The intended return of results through the callback.

The Solution

Callback Placement: Ensure that the callback function cb is designated correctly within your nested function structure. When dealing with callbacks, the first parameter should generally be the callback function itself.

Avoid Unnecessary Async: In the context of MongoDB queries, marking the callback function as async is unnecessary and can lead to confusion, as the callback is intended to handle the result or error directly rather than returning a promise.

Here’s a simplified and corrected version of how to implement your fun2 function:

[[See Video to Reveal this Text or Code Snippet]]

Key Takeaways

Check Callback Function: The callback (cb) must be the first parameter of your function. This ensures that it is accessible and correctly invoked later on in your code.

Simplicity is Key: While it may be tempting to use async functions excessively, often simple callbacks can handle the logic more straightforwardly without the added complexity.

Conclusion

Feel free to reach out if you have any further questions or issues regarding callback functions and database operations in JavaScript. Happy coding!