Скачать или смотреть How to Copy or Move a Key from a Nested Object to the Top Level in Jolt

Learn how to effectively copy or move a key from a nested object to the top level using Jolt transformations in JSON.
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This video is based on the question https://stackoverflow.com/q/67641357/ asked by the user 'Mike Twc' ( https://stackoverflow.com/u/7775187/ ) and on the answer https://stackoverflow.com/a/67641886/ provided by the user 'Barbaros Özhan' ( https://stackoverflow.com/u/5841306/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Moving a Key from Nested Objects to the Top Level in Jolt

When dealing with JSON transformations, especially in complex systems, you may find yourself needing to adjust the structure of your data. Specifically, one common requirement is to move or copy a key from a nested object up to the top level of your JSON structure. If you've encountered this challenge, you're not alone! In this guide, we’ll explore how you can accomplish this effectively using Jolt.

Understanding the Problem

Let's consider an example to illustrate the problem:

Input JSON Structure

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You want to extract orderNumber from the details nested object and place it at the top level alongside id and name. Your desired output should look something like this:

Desired Output JSON Structure

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The Jolt Solution

Original Attempt

First, you might have tried the following Jolt specification, which yielded an undesired output. In this case, the transformation turned your object into a value array:

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The Correct Transformation

You're almost there! To make the change you need, you only require a minor adjustment in your Jolt specification. Here’s the corrected version that will effectively move orderNumber to the top level:

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

Explanation of Changes

Shift Operation: The shift operation allows you to specify how to move values from the source JSON to the target JSON structure.

Using &1.&: This notation ensures that keys are preserved as you move values, effectively managing the transition of details content without losing any information.

With this transformation, you will achieve the objective, successfully moving orderNumber to the top level while also preserving the rest of the details object.

Conclusion

Manipulating JSON data is a common task in many applications, and Jolt is a powerful tool to help ease this process. By understanding how to shift keys effectively, you can maintain the necessary structure of your data while adapting it to meet your application needs. So the next time you need to copy or move a key from a nested object, remember this guide and the key transformation technique discussed!

Feel free to experiment with different JSON structures and Jolt specifications to become even more proficient at handling JSON transformations. Happy coding!