How to Achieve Case-Insensitive Sorting with Firestore Queries?

Cloud Firestore Case-Insensitive Sorting with Queries

Cloud Firestore supports sorting data using the OrderBy method, but it does so in a case-sensitive manner. This can lead to unexpected results when sorting strings that differ only in capitalization.

To achieve case-insensitive sorting, a workaround involves storing the data twice: once in its original case and once in a case-insensitive format. This allows queries to be performed on the case-insensitive version of the data while displaying the original data.

Here's how it works:

• Create a new field in your document that stores a case-insensitive version of the original field. For example, if your original field is called "myData," create a new field called "myData_insensitive."
• Use the following JavaScript function to normalize the case of the string before storing it in "myData_insensitive":

<code class="javascript">caseFoldNormalize = function (s) {
  return s.normalize('NFKC').toLowerCase().toUpperCase().toLowerCase();
};</code>

• Now, you can query your Firestore collection using OrderBy on the "myData_insensitive" field to achieve case-insensitive sorting.

By following these steps, you can sort your data in a case-insensitive manner without having to resort to manual sorting. Note that this workaround requires storing duplicate data, which may have performance implications for large datasets.

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