Exercise Tracker - Help

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1

Hi

I have started doing the Exercise Tracker micro service, however, I am finding it extremely difficult to understand what the :_id parameter is.

It’s being used almost everywhere but I just cannot grasp it. What makes matters worse is that they demo project that FCC host does not work 100%.

Anyone able to shed some light?

Much appreciated!

2

MongoDB assigns an id to every document it stores, which is under the parameter “_id”.

3

Yes, 100%. However, is this the same _id parameter that’s used when posting and querying exercises?

4

the id can be anything you assign it, but its convenient you use the generic id which mongo assigns.
For example this requirement:

You can POST to /api/users with form data username to create a new user. The returned response will be an object with username and _id properties.

The user POST with data username. You create a document with that username in mongo. The document will automatically acquire a prop _id. You can then return that object in the response, containing the username and _id.

5

Thank you so much for clarity. I just wanted to bounce my understanding of the project requirements.

6

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