fix: Host schedule not updating upon updating/deleting default schedule

packages/lib/server/repository/host.ts

@@ -0,0 +1,15 @@
+import prisma from "@calcom/prisma";
+
+export class HostRepository {
+  static async updateHostsSchedule(userId: number, oldScheduleId: number, newScheduleId: number) {
+    return await prisma.host.updateMany({
+      where: {
+        userId,
+        scheduleId: oldScheduleId,
+      },
+      data: {
+        scheduleId: newScheduleId,
+      },
+    });
+  }
+}

packages/trpc/server/routers/viewer/availability/schedule/delete.handler.ts

@@ -3,6 +3,7 @@ import { prisma } from "@calcom/prisma";
 import { TRPCError } from "@trpc/server";
 
 import type { TrpcSessionUser } from "../../../../types";
+import { updateHostsWithNewDefaultSchedule } from "../util";
 import type { TDeleteInputSchema } from "./delete.schema";
 
 type DeleteOptions = {
@@ -45,6 +46,8 @@ export const deleteHandler = async ({ input, ctx }: DeleteOptions) => {
     // to throw the error if there arent any other schedules
     if (!scheduleToSetAsDefault) throw new TRPCError({ code: "BAD_REQUEST" });
 
+    await updateHostsWithNewDefaultSchedule(user.id, input.scheduleId, scheduleToSetAsDefault.id);
+
     await prisma.user.update({
       where: {
         id: user.id,
@@ -53,7 +56,10 @@ export const deleteHandler = async ({ input, ctx }: DeleteOptions) => {
         defaultScheduleId: scheduleToSetAsDefault?.id || null,
       },
     });
+  } else if (user.defaultScheduleId) {
+    await updateHostsWithNewDefaultSchedule(user.id, input.scheduleId, user.defaultScheduleId);
   }
+
   await prisma.schedule.delete({
     where: {
       id: input.scheduleId,

packages/trpc/server/routers/viewer/availability/schedule/update.handler.ts

@@ -6,7 +6,7 @@ import { prisma } from "@calcom/prisma";
 import { TRPCError } from "@trpc/server";
 
 import type { TrpcSessionUser } from "../../../../types";
-import { setupDefaultSchedule } from "../util";
+import { setupDefaultSchedule, updateHostsWithNewDefaultSchedule } from "../util";
 import type { TUpdateInputSchema } from "./update.schema";
 
 type User = NonNullable<TrpcSessionUser>;
@@ -61,6 +61,10 @@ export const updateHandler = async ({ input, ctx }: UpdateOptions) => {
 
   let updatedUser;
   if (input.isDefault) {
+    if (user?.defaultScheduleId) {
+      await updateHostsWithNewDefaultSchedule(user.id, user.defaultScheduleId, input.scheduleId);
+    }
+
     const setupDefault = await setupDefaultSchedule(user.id, input.scheduleId, prisma);
     updatedUser = setupDefault;
   }

packages/trpc/server/routers/viewer/availability/util.test.ts

@@ -0,0 +1,197 @@
+import { describe, expect, it, vi, beforeEach } from "vitest";
+
+import { PrismaClient } from "@calcom/prisma";
+
+import {
+  getDefaultScheduleId,
+  hasDefaultSchedule,
+  setupDefaultSchedule,
+  updateHostsWithNewDefaultSchedule,
+} from "./util";
+
+vi.mock("@calcom/prisma", () => {
+  const mockPrisma = {
+    user: {
+      findUnique: vi.fn(),
+      update: vi.fn(),
+    },
+    schedule: {
+      findFirst: vi.fn(),
+    },
+    host: {
+      updateMany: vi.fn(),
+    },
+  };
+  return {
+    __esModule: true,
+    default: mockPrisma,
+    PrismaClient: vi.fn(() => mockPrisma),
+  };
+});
+
+describe("Availability Utils", () => {
+  let prisma: PrismaClient;
+
+  beforeEach(() => {
+    prisma = new PrismaClient();
+    vi.clearAllMocks();
+  });
+
+  describe("getDefaultScheduleId", () => {
+    it("should return defaultScheduleId if user has one", async () => {
+      const userId = 1;
+      const defaultScheduleId = 123;
+
+      (prisma.user.findUnique as any).mockResolvedValue({
+        defaultScheduleId,
+      });
+
+      const result = await getDefaultScheduleId(userId, prisma);
+
+      expect(prisma.user.findUnique).toHaveBeenCalledWith({
+        where: { id: userId },
+        select: { defaultScheduleId: true },
+      });
+      expect(result).toBe(defaultScheduleId);
+    });
+
+    it("should find and return first schedule if user has no defaultScheduleId", async () => {
+      const userId = 1;
+      const scheduleId = 456;
+
+      (prisma.user.findUnique as any).mockResolvedValue({
+        defaultScheduleId: null,
+      });
+
+      (prisma.schedule.findFirst as any).mockResolvedValue({
+        id: scheduleId,
+      });
+
+      const result = await getDefaultScheduleId(userId, prisma);
+
+      expect(prisma.user.findUnique).toHaveBeenCalledWith({
+        where: { id: userId },
+        select: { defaultScheduleId: true },
+      });
+      expect(prisma.schedule.findFirst).toHaveBeenCalledWith({
+        where: { userId },
+        select: { id: true },
+      });
+      expect(result).toBe(scheduleId);
+    });
+
+    it("should throw error if no schedules found", async () => {
+      const userId = 1;
+
+      (prisma.user.findUnique as any).mockResolvedValue({
+        defaultScheduleId: null,
+      });
+
+      (prisma.schedule.findFirst as any).mockResolvedValue(null);
+
+      await expect(getDefaultScheduleId(userId, prisma)).rejects.toThrow("No schedules found for user");
+    });
+  });
+
+  describe("hasDefaultSchedule", () => {
+    it("should return true if user has defaultScheduleId", async () => {
+      const user = { id: 1, defaultScheduleId: 123 };
+
+      const result = await hasDefaultSchedule(user, prisma);
+
+      expect(result).toBe(true);
+    });
+
+    it("should return true if user has a schedule", async () => {
+      const user = { id: 1, defaultScheduleId: null };
+
+      (prisma.schedule.findFirst as any).mockResolvedValue({
+        id: 456,
+      });
+
+      const result = await hasDefaultSchedule(user, prisma);
+
+      expect(prisma.schedule.findFirst).toHaveBeenCalledWith({
+        where: { userId: user.id },
+      });
+      expect(result).toBe(true);
+    });
+
+    it("should return false if user has no defaultScheduleId and no schedules", async () => {
+      const user = { id: 1, defaultScheduleId: null };
+
+      (prisma.schedule.findFirst as any).mockResolvedValue(null);
+
+      const result = await hasDefaultSchedule(user, prisma);
+
+      expect(prisma.schedule.findFirst).toHaveBeenCalledWith({
+        where: { userId: user.id },
+      });
+      expect(result).toBe(false);
+    });
+  });
+
+  describe("setupDefaultSchedule", () => {
+    it("should update user with new defaultScheduleId", async () => {
+      const userId = 1;
+      const scheduleId = 123;
+      const updatedUser = { id: userId, defaultScheduleId: scheduleId };
+
+      (prisma.user.update as any).mockResolvedValue(updatedUser);
+
+      const result = await setupDefaultSchedule(userId, scheduleId, prisma);
+
+      expect(prisma.user.update).toHaveBeenCalledWith({
+        where: { id: userId },
+        data: { defaultScheduleId: scheduleId },
+      });
+      expect(result).toEqual(updatedUser);
+    });
+  });
+
+  describe("updateHostsWithNewDefaultSchedule", () => {
+    it("should update hosts with new scheduleId", async () => {
+      const userId = 1;
+      const oldScheduleId = 123;
+      const newScheduleId = 456;
+      const updateResult = { count: 2 }; // 2 hosts updated
+
+      (prisma.host.updateMany as any).mockResolvedValue(updateResult);
+
+      const result = await updateHostsWithNewDefaultSchedule(userId, oldScheduleId, newScheduleId, prisma);
+
+      expect(prisma.host.updateMany).toHaveBeenCalledWith({
+        where: {
+          userId,
+          scheduleId: oldScheduleId,
+        },
+        data: {
+          scheduleId: newScheduleId,
+        },
+      });
+      expect(result).toEqual(updateResult);
+    });
+
+    it("should handle case with no hosts to update", async () => {
+      const userId = 1;
+      const oldScheduleId = 123;
+      const newScheduleId = 456;
+      const updateResult = { count: 0 }; // No hosts updated
+
+      (prisma.host.updateMany as any).mockResolvedValue(updateResult);
+
+      const result = await updateHostsWithNewDefaultSchedule(userId, oldScheduleId, newScheduleId, prisma);
+
+      expect(prisma.host.updateMany).toHaveBeenCalledWith({
+        where: {
+          userId,
+          scheduleId: oldScheduleId,
+        },
+        data: {
+          scheduleId: newScheduleId,
+        },
+      });
+      expect(result).toEqual(updateResult);
+    });
+  });
+});

packages/trpc/server/routers/viewer/availability/util.ts

@@ -1,5 +1,6 @@
 import type { User } from "@prisma/client";
 
+import { HostRepository } from "@calcom/lib/server/repository/host";
 import type { PrismaClient } from "@calcom/prisma";
 
 export const getDefaultScheduleId = async (userId: number, prisma: PrismaClient) => {
@@ -53,3 +54,11 @@ export const setupDefaultSchedule = async (userId: number, scheduleId: number, p
     },
   });
 };
+
+export const updateHostsWithNewDefaultSchedule = async (
+  userId: number,
+  defaultScheduleId: number,
+  scheduleId: number
+) => {
+  return await HostRepository.updateHostsSchedule(userId, defaultScheduleId, scheduleId);
+};