Server Value Expressions for Data Connect
Blog post from Firebase
Firebase Data Connect, now renamed SQL Connect, supports server-computed database values that reduce reliance on client-provided data and help prevent issues such as users impersonating others by submitting arbitrary IDs. Previously limited to values such as `auth.uid`, `request.time`, and `uuidV4()`, server-side expressions can populate fields automatically through schema defaults or generated `<field>_expr` inputs in queries and mutations. The update expands this capability through Common Expression Language (CEL) expressions, enabling access to authentication token data, request variables, string concatenation, and more complex computed values. Examples include prefixing user IDs by region, assigning Firebase Authentication UIDs to profile records, combining a doctor’s name and degree into a display name, and dynamically matching such values in queries.
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