Attempting to run curl http://localhost:3000/api/v1/tickets.json -d {"heat_ticket_number": "123whatever", "customers_affected ": "34"} returns the following in server log: TypeError (compared with non class/module):

tickets.rb

module API
  module V1
    class Tickets < Grape::API
      include API::V1::Defaults

      resource :tickets do
        desc "Return all tickets"
        get "", root: :tickets do
          Ticket.all
        end

        desc "Return a ticket"
        params do
          requires :id, type: String, desc: "ID of the ticket"
        end
        get ":id", root: "ticket" do
          Ticket.where(id: permitted_params[:id]).first!
        end

        desc "Create a ticket"
        params do
          requires :heat_ticket_number, type: String
          requires :customers_affected, type: String
        end
        #creates a new ticket
        post do
          Ticket.create!({
            heat_ticket_number:params[:heat_ticket_number],
            customers_affected:params[:customers_affected]
          })         
        end
      end
    end
  end
end