updateAskingPrice with permissions

scratch_33.es6

const Mutation = {
  updateVehicleAskingPrice: async (parent, { id, askingPrice }, context, info) => {
    const userId = getUserId(context)
    const isRequestingUserManager = await context.db.exists.User({
      id: userId,
      role: `MANAGER`
    })
    if (isRequestingUserManager) {
      return await context.db.mutation.updateVehicle({
        where: { id },
        data: { askingPrice }
      })
    }
    throw new Error(
        `Invalid permissions, you must be a manager to update vehicle year`
    )
  }
}