Vertragstypen für Änderungsanfragen pflegen

backend/src/routes/portal/contracts.ts

@@ -32,6 +32,7 @@ async function getPortalContract(server: FastifyInstance, req: any, contractId:
             tenant: contracts.tenant,
             customer: contracts.customer,
             contracttype: contracts.contracttype,
+            allowedContracttypes: contracts.allowedContracttypes,
             archived: contracts.archived,
         })
         .from(contracts)
@@ -121,6 +122,14 @@ export default async function portalContractRoutes(server: FastifyInstance) {
             return reply.code(400).send({ error: "Ungültiger Vertragstyp" })
         }
 
+        const allowedContracttypes = Array.isArray(contract.allowedContracttypes)
+            ? contract.allowedContracttypes.map((id) => Number(id)).filter((id) => Number.isInteger(id))
+            : []
+
+        if (!allowedContracttypes.includes(requestedContracttype.id)) {
+            return reply.code(400).send({ error: "Dieser Vertragstyp steht für diesen Vertrag nicht zur Auswahl" })
+        }
+
         const [currentContracttype] = contract.contracttype
             ? await server.db
                 .select({