Scrum4Me/docs/patterns/server-action.md

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# Patroon: Server Action
Altijd in `actions/[domein].ts`. Nooit inline in page.tsx.
```ts
'use server'
import { revalidatePath } from 'next/cache'
import { getIronSession } from 'iron-session'
import { cookies } from 'next/headers'
import { z } from 'zod'
import { prisma } from '@/lib/prisma'
import { SessionData, sessionOptions } from '@/lib/session'
const schema = z.object({
productId: z.string().cuid(),
title: z.string().min(1).max(200),
priority: z.number().int().min(1).max(4),
})
export async function createPbi(formData: FormData) {
// 1. Auth
const session = await getIronSession<SessionData>(await cookies(), sessionOptions)
if (!session.userId) return { error: 'Niet ingelogd' }
if (session.isDemo) return { error: 'Niet beschikbaar in demo-modus' }
// 2. Validatie
const parsed = schema.safeParse({
productId: formData.get('productId'),
title: formData.get('title'),
priority: Number(formData.get('priority')),
})
if (!parsed.success) return { error: parsed.error.flatten().fieldErrors }
// 3. Eigenaarschap controleren
const product = await prisma.product.findFirst({
where: { id: parsed.data.productId, user_id: session.userId }
})
if (!product) return { error: 'Product niet gevonden' }
// 4. Schrijven
const last = await prisma.pbi.findFirst({
where: { product_id: parsed.data.productId, priority: parsed.data.priority },
orderBy: { sort_order: 'desc' },
})
const pbi = await prisma.pbi.create({
data: { ...parsed.data, product_id: parsed.data.productId, sort_order: (last?.sort_order ?? 0) + 1.0 },
})
revalidatePath(`/products/${parsed.data.productId}`)
return { success: true, pbi }
}
```