Unique Reference Number for Collection Items using Loops

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Create unique reference numbers for each item in your dynamic collection using loops. Unique reference numbers are an easy way for you or your website users to search or locate a specific item in your collection. This method is not impacted if records are subsequently removed from the collection.
The best time to add a unique reference number to a dynamic item in your collection is at the point the item is created. This explanation assumes you already know how to create a standard form for entering your data into a collection. In addition to the write only dataset which your form will populate with data, we will add a second instance of the same dataset which will be assigned to read only. The reason for this is that we cannot reference write only datasets in a loop, and read/write datasets are not suitable for form entry. The screenshot below shows two datasets: #dbCodeBank (write only) and #dbCodeBank2 (read only) used in this example. We also create a field in the collection to store the unique reference number, called 'itemNumber' in this example.
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Disclaimer: To the best of our knowledge, this code works for its stipulated purpose. If you find an error in our code, or know of a better way to achieve the same result - please contact us! We will help where we can, however please be aware that the code is provided 'as is' and without a promise of support in using or implementing it.
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