fix: more precise error code for event type duplication handler (#23059)

* fix: unique constraint violation

* refactor

* add test

* fix space

* clean up

packages/trpc/server/routers/viewer/eventTypes/duplicate.handler.test.ts

@@ -0,0 +1,46 @@
+import prismaMock from "../../../../../../tests/libs/__mocks__/prismaMock";
+
+import { PrismaClientKnownRequestError } from "@prisma/client/runtime/library";
+import { describe, it, expect, vi, beforeEach } from "vitest";
+
+import { TRPCError } from "@trpc/server";
+
+import { duplicateHandler } from "./duplicate.handler";
+
+vi.mock("@calcom/prisma", () => ({
+  default: prismaMock,
+}));
+vi.mock("@calcom/lib/server/repository/eventTypeRepository");
+
+describe("duplicateHandler", () => {
+  const ctx = { user: { id: 1, profile: { id: 1 } } } as any;
+  const input = { id: 123, slug: "test-event", title: "Test", description: "Test", length: 30, teamId: null };
+  const eventType = { id: 123, userId: 1, teamId: null, users: [{ id: 1 }] };
+
+  beforeEach(() => {
+    vi.resetAllMocks();
+    prismaMock.eventType.findUnique.mockResolvedValue(eventType);
+  });
+
+  it("should throw BAD_REQUEST in case of unique constraint violation", async () => {
+    const { EventTypeRepository } = await import("@calcom/lib/server/repository/eventTypeRepository");
+    vi.mocked(EventTypeRepository).mockImplementation(
+      () =>
+        ({
+          create: vi.fn().mockRejectedValue(
+            new PrismaClientKnownRequestError("Unique constraint failed", {
+              code: "P2002",
+              clientVersion: "mockedVersion",
+            })
+          ),
+        } as any)
+    );
+
+    await expect(duplicateHandler({ ctx, input })).rejects.toThrow(
+      new TRPCError({
+        code: "BAD_REQUEST",
+        message: "Unique constraint violation while creating a duplicate event.",
+      })
+    );
+  });
+});

packages/trpc/server/routers/viewer/eventTypes/duplicate.handler.ts

@@ -226,6 +226,13 @@ export const duplicateHandler = async ({ ctx, input }: DuplicateOptions) => {
       eventType: newEventType,
     };
   } catch (error) {
+    if (error instanceof Prisma.PrismaClientKnownRequestError && error.code === "P2002") {
+      // unique constraint violation
+      throw new TRPCError({
+        code: "BAD_REQUEST",
+        message: "Unique constraint violation while creating a duplicate event.",
+      });
+    }
     throw new TRPCError({ code: "INTERNAL_SERVER_ERROR", message: `Error duplicating event type ${error}` });
   }
 };