diff --git a/db/booking.ts b/db/booking.ts
index 104afc6..7e2c21f 100644
--- a/db/booking.ts
+++ b/db/booking.ts
@@ -64,6 +64,25 @@ BookingSchema.virtual('days').get(function () {
   return getDays({ startDate: this.startDate, endDate: this.endDate })
 })
 
+BookingSchema.static('findBookedDays', async function (): string[] {
+  console.log('in findBookedDays this is', this)
+  const bookings = await this.find(
+    {
+      status: { $in: [BOOKING_STATUS.REQUESTED, BOOKING_STATUS.CONFIRMED] },
+      $or: [
+        { endDate: { $gt: new Date() } },
+        { startDate: { $gt: new Date() } },
+      ],
+    },
+    'startDate endDate'
+  ).exec()
+
+  return bookings
+    .map((booking: Booking) => booking.days)
+    .flat()
+    .sort()
+})
+
 const Model: mongoose.Model<Booking> =
   mongoose.models.Booking || mongoose.model('Booking', BookingSchema)
 
diff --git a/db/index.ts b/db/index.ts
index e21dd67..4e3eb9d 100644
--- a/db/index.ts
+++ b/db/index.ts
@@ -20,22 +20,7 @@ function connect() {
 
 export async function getBookedDays() {
   await connect()
-
-  const bookings = await Booking.find(
-    {
-      status: { $in: [BOOKING_STATUS.REQUESTED, BOOKING_STATUS.CONFIRMED] },
-      $or: [
-        { endDate: { $gt: new Date() } },
-        { startDate: { $gt: new Date() } },
-      ],
-    },
-    'startDate endDate'
-  ).exec()
-
-  return bookings
-    .map((booking) => booking.days)
-    .flat()
-    .sort()
+  return Booking.findBookedDays()
 }
 
 export async function getBookingByUUID(uuid: string) {
@@ -62,10 +47,7 @@ export async function createBooking({
 
   if (booking.days.some((day: string) => bookedDays.includes(day))) {
     const error = new mongoose.Error.ValidationError(booking)
-    error.addError(
-      'endDate',
-      'At least on one day the van is not avaliable. Choose another startDate or endDate.'
-    )
+    error.addError('endDate', new mongoose.Error.ValidatorError())
     throw error
   }