Derive Elysia request validators from Drizzle tables via drizzle-typebox

README.md

@@ -15,7 +15,10 @@ bun run dev
 ## Layout
 
 - `src/db/` — Drizzle schema (`printers`, `farms`, `print_jobs`, `frame_embeddings`)
-  and client, pointed at pgCat.
+  and client, pointed at pgCat. `src/db/validators.ts` derives Elysia/TypeBox
+  request validators straight from the Drizzle tables via `drizzle-typebox`,
+  so the Postgres schema and the API validators come from one definition
+  instead of two hand-synced ones.
 - `src/s3/` — R2 presigned URL helpers (`PUT` for client uploads, `GET` for the
   edge proxy).
 - `src/queue/` — Redis client + `XADD` helper pushing onto `stream:camera_frames`

package.json

@@ -19,6 +19,8 @@
     "@aws-sdk/client-s3": "^3.658.1",
     "@aws-sdk/s3-request-presigner": "^3.658.1",
     "drizzle-orm": "^0.33.0",
+    "drizzle-typebox": "^0.2.1",
+    "@sinclair/typebox": "^0.33.12",
     "postgres": "^3.4.4",
     "ioredis": "^5.4.1"
   },

src/db/validators.ts

@@ -0,0 +1,22 @@
+import { createInsertSchema, createSelectSchema } from "drizzle-typebox";
+import { t } from "elysia";
+import { printers, printJobs } from "./schema";
+
+// Generated straight from the Drizzle table definitions in `./schema` — this
+// is the *only* place these shapes are defined. The Postgres column and the
+// Elysia request/response validator can no longer drift apart: change a
+// column in `./schema/printers.ts` and both the DB migration and the API
+// validator below pick it up automatically.
+//
+// The second argument overrides fields Drizzle can't infer correctly for an
+// insert — `id` is DB-generated (defaultRandom()) so it must be optional on
+// the way in, even though it's required on the way out.
+export const PrinterInsertSchema = createInsertSchema(printers, {
+  id: t.Optional(t.String({ format: "uuid" })),
+});
+export const PrinterSelectSchema = createSelectSchema(printers);
+
+export const PrintJobInsertSchema = createInsertSchema(printJobs, {
+  id: t.Optional(t.String({ format: "uuid" })),
+});
+export const PrintJobSelectSchema = createSelectSchema(printJobs);

src/routes/printers.ts

@@ -2,6 +2,7 @@ import { Elysia, t } from "elysia";
 import { eq } from "drizzle-orm";
 import { db } from "../db";
 import { printers } from "../db/schema";
+import { PrinterInsertSchema } from "../db/validators";
 
 export const printerRoutes = new Elysia({ prefix: "/printers" })
   .get("/", async ({ query }) => {
@@ -21,28 +22,14 @@ export const printerRoutes = new Elysia({ prefix: "/printers" })
   .post(
     "/",
     async ({ body, set }) => {
-      const [printer] = await db
+      // `body` is already validated + shaped against the Drizzle table by
-        .insert(printers)
+      // PrinterInsertSchema, so it can go straight into `.values()` with no
-        .values({
+      // hand-mapping of individual fields.
-          farmId: body.farmId,
+      const [printer] = await db.insert(printers).values(body).returning();
-          name: body.name,
-          vendor: body.vendor,
-          lanAddress: body.lanAddress,
-          serialNumber: body.serialNumber,
-          accessCode: body.accessCode,
-        })
-        .returning();
       set.status = 201;
       return printer;
     },
-    {
+    // Derived from `printers` via drizzle-typebox — see src/db/validators.ts.
-      body: t.Object({
+    // Add or rename a column in the schema and this validator updates itself.
-        farmId: t.String({ format: "uuid" }),
+    { body: PrinterInsertSchema },
-        name: t.String({ minLength: 1 }),
-        vendor: t.Union([t.Literal("bambu"), t.Literal("prusa"), t.Literal("klipper")]),
-        lanAddress: t.Optional(t.String()),
-        serialNumber: t.Optional(t.String()),
-        accessCode: t.Optional(t.String()),
-      }),
-    },
   );