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Prevent selected fields on child form having the same value

GOAL

When using Nested Forms, prevent duplicate values across multiple child entries in the same batch/session for specific fields you choose (e.g., a number field, a name field, or a date field).

CONFIGURATION

$forms_and_fields: Add your child form ID as the key, and list the child field IDs you want to keep unique with the message users should see if they choose a duplicate.
Example: 66 => [ 4 => 'Please choose a unique value.', 2 => 'First and last name must be unique.' ]

NOTES

Name fields compare First AND Last together. If both match an existing entry, it's considered a duplicate.
Date fields compare dates using the site's timezone. If parsing fails, the comparison for that item is skipped.

https://raw.githubusercontent.com/Eitan-brightleaf/snippets/main/Prevent%20selected%20fields%20on%20child%20form%20having%20the%20same%20value.php

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