lighthouse_api_move_tickets_to_next_milestone.rb

require 'rubygems'
require 'Lighthouse'

# Update these settings to reflect your project:
Lighthouse.account = 'account'
Lighthouse.token = 'token'
project_id = 'your project id'

now = Time.now
current = nil  # Will the the current milestone.
upcoming = nil  # Will be the next milestone.
milestones = Lighthouse::Milestone.find(:all, :params => { :project_id => project_id })
for milestone in milestones
    if current.nil? or now > milestone.due_on
        current = milestone
    elsif upcoming.nil? or now < milestone.due_on
        upcoming = milestone
        break
    end
end

# Lighthouse returns max 30 tickets - continue until no more tickets in the milestone.
loop do
    params = { :project_id => project_id, :q=> "state:open milestone:\"#{current.title}\"" }
    tickets = Lighthouse::Ticket.find(:all, :params => params)
    break unless tickets != []
    for ticket in tickets
      ticket.milestone_id = upcoming.id
      ticket.save()
    end
end