Better Arrays in Cloud Firestore!
Blog post from Firebase
Cloud Firestore introduced improved array support to address the limitations and concurrency risks of modifying arrays by index in multi-user applications. Developers can now query documents for values contained in arrays using `array-contains`, avoiding earlier map-based workarounds and supporting non-string array values. New `arrayUnion` and `arrayRemove` operations provide set-like updates by adding only values not already present and removing all matching values rather than targeting specific positions. The updates also expand security rules, allowing access controls based on whether an array contains a specified element, such as permitting queries only when a user appears in a document’s viewers array. These capabilities require the latest Firestore client SDKs.
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