Скачать или смотреть How to Efficiently Add Key:Pair Values to a Nested Dictionary in Ansible

Learn how to seamlessly add key-pair values to a nested dictionary in Ansible, using a step-by-step guide complete with examples and code snippets. Enhance your automation scripting skills today!
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This video is based on the question https://stackoverflow.com/q/76522058/ asked by the user 'uncag3d' ( https://stackoverflow.com/u/18291224/ ) and on the answer https://stackoverflow.com/a/76524546/ provided by the user 'Vladimir Botka' ( https://stackoverflow.com/u/6482561/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Mastering Nested Dictionaries in Ansible

In the realm of Ansible, working with nested dictionaries often feels like an uphill battle, especially when trying to update values based on specifications. If you've encountered a situation similar to the one posed below, you’re not alone. Let's unravel the complexities behind adding a key:pair value to a nested dictionary and simplify the process.

The Problem: Updating a Nested Dictionary

Imagine you have a main dictionary, db_dict, structured to hold various key-value pairs, including a list of pluggable databases (pdbs). Your goal is to integrate new latest_success information, mapping it appropriately to each pdb within the dictionary.

Here’s the structure of db_dict:

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

You also have a list termed seed_latest_success_list which contains new updates related to each pdb. Your mission is to correctly append these updates to the pdbs list in db_dict.

The Solution: Step-by-Step Guide

Step 1: Convert List to Dictionary

To make the manipulation easier, convert seed_latest_success_list into a dictionary format capable of mapping latest_success directly to each pdb.

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

This will give you a structured dictionary like:

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

Step 2: Extract pdbs and Prepare Update

Next, extract the keys and values from the pdbs list to create a new dictionary that incorporates the latest_success values:

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

Step 3: Create the Update Dictionary

Next, format the new data into the final structure needed for db_dict:

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

This results in:

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

Step 4: Update the Dictionary

Finally, merge the db_dict_update with the existing db_dict using the combine filter from Ansible:

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

Complete Example Playbook

Here’s how the entire playbook looks in action, confirming the successful update of db_dict:

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

Conclusion

Updating a nested dictionary in Ansible may seem overwhelming at first, but by breaking the process down into manageable steps, it can be accomplished efficiently. As you continue to explore Ansible’s capabilities, this technique will enhance your automation scripts, making them more powerful and manageable.

Happy scripting!