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name: server-action-pattern description: Create or modify a Next.js Server Action for the JKKN institution website following the project's mandatory pattern. This skill should be used when the user asks to "add a server action", "create a mutation", "wire up a form submit", "add create/update/delete logic", "save/update/delete an entity", or any data-writing function under app/actions/. Enforces the project rule that CRUD uses Server Actions (never API routes): 'use server', Zod validation, the Supabase server client, an auth check, revalidatePath, and activity logging via logActivity. Pairs with admin-crud-pages (which consumes these actions) and database-documentation-workflow (when the action needs a new table).

Server Action Pattern (JKKN Institution Website)

Purpose

Write data-mutating logic the single way this codebase does it. Every file in app/actions/ is a 'use server' module that validates input with Zod, talks to Supabase through the server client, checks auth, revalidates affected paths, and logs the activity. Following this exactly keeps mutations secure (server-side validation, RLS-protected) and consistent with ~46 existing action files.

Hard rules (from CLAUDE.md — non-negotiable)

1. No API routes for CRUD. All create/update/delete go through Server Actions.
2. Server-side validation always. Never trust client input — parse with Zod inside the action.
3. Auth check before mutating. supabase.auth.getUser(); bail if no user.
4. Activity logging for create/update/delete via logActivity (or an ActivityHelpers.* helper).
5. Revalidate every path whose data changed with revalidatePath(...).

When to use

• "Add a server action to save/update/delete X"
• "Wire up this form to submit" / "handle form submission"
• "Create the mutation for <entity>"
• Any new function under app/actions/ (or app/actions/cms/ for CMS-scoped actions)

Do not use for:

• Pure read-only Server Components fetching data inline (no mutation) — though shared read helpers (getX) commonly live in the same action file.
• Admin page/table scaffolding → use admin-crud-pages (it calls these actions).

Workflow

Start from templates/server-action.template.ts. Steps:

1. Place the file. app/actions/<entity>.ts, or app/actions/cms/<entity>.ts for CMS features. Group reads (getX) and writes (createX, updateX, deleteX) for one entity in one file.
2. 'use server' as the first line.
3. Import the server client from @/lib/supabase/server:
   • createServerSupabaseClient() — default; respects the signed-in user + RLS.
   • createAdminSupabaseClient() — service role, bypasses RLS. Use ONLY for admin operations that legitimately must (e.g. creating users). Never expose to the client.
4. Define a Zod schema per mutation. Enforce domain rules (e.g. emails end with @jkkn.ac.in via .refine(...)).
5. Auth check: const { data: { user } } = await supabase.auth.getUser(); return Unauthorized if missing.
6. (Optional) permission check: checkPermission(user.id, 'module:resource:action') from ./permissions for protected operations.
7. Validate formData/args with schema.parse(...) inside a try/catch (catch z.ZodError).
8. Mutate via Supabase; handle error explicitly.
9. Log activity with logActivity({ userId, action, module, resourceType, resourceId, metadata }).
10. revalidatePath(...) for each affected route (e.g. the admin list AND the public page).
11. Return a typed result. Two shapes exist in the codebase — pick one and be consistent within the file: simple { success: boolean; error?: string; data?: T } (see app/actions/videos.ts) or the richer FormState used with useActionState/useFormState (see app/actions/users.ts).

If the action requires a new table/column/policy, follow database-documentation-workflow FIRST (document the SQL, then apply the migration) before writing the action.

Verification

• npm run build compiles.
• Unauthenticated call returns the unauthorized result (does not mutate).
• Invalid input returns the Zod message (does not mutate).
• After a successful mutation the list/public page reflects the change (revalidation works).
• A row appears in user_activity_logs.

Red-flag checklist

• [ ] First line is 'use server'?
• [ ] Did I avoid creating an API route for this CRUD?
• [ ] Zod schema validates every input server-side?
• [ ] Auth checked before the mutation?
• [ ] logActivity called for create/update/delete?
• [ ] revalidatePath for every affected route?
• [ ] Consistent return shape within the file?
• [ ] If a new table was needed, did I document+migrate via database-documentation-workflow first?

Bundled resources

• templates/server-action.template.ts — full read+create+update+delete action module.
• references/conventions.md — client choice, return shapes, logActivity enums, permission format.