How to Destructure JSON Requests using TypeScript in Nest.js

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Understanding the Problem

You've received a JSON request from a user that looks like this:

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

Your task is straightforward but critical: you need to save this data into two separate tables in your database—one for profile information and another for nutrients. Specifically, you need to extract the title and timestamp for the profile table, while for the nutrients table, you will save details such as the last inserted profile ID, group ID, nutrient ID, quantity, and unit.

Step-by-Step Solution

1. Extracting Profile Data

First, you need to create an instance of the profile entity using the title from your JSON request. Make sure your ProfileEntity is properly defined to accept the title.

Here's how to do that:

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

2. Structuring Nutrients Data

Next, you'll need to extract the nutrients data from the JSON request. To do this efficiently, you can leverage JavaScript's flatMap() method to map over the arrays and build the desired nutrient records. Here’s the code for that:

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

3. Saving Nutrients Data

Once you've structured the data correctly, it's time to save the nutrient records into the database. Use the NutrientsEntity to create these records like so:

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

Putting It All Together

In summary, the complete code to handle your JSON request would look like this:

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

Conclusion

Whether you're just starting out or looking to polish your skills, mastering this technique will prove invaluable. Happy coding!