Redmine/app/controllers/gantts_controller.rb

class GanttsController < ApplicationController
  menu_item :gantt
  before_filter :find_optional_project

  rescue_from Query::StatementInvalid, :with => :query_statement_invalid

  helper :issues
  helper :projects
  helper :queries
  include QueriesHelper
  helper :sort
  include SortHelper
  include Redmine::Export::PDF
  
  def show
    @gantt = Redmine::Helpers::Gantt.new(params)
    retrieve_query
    @query.group_by = nil
    if @query.valid?
      events = []
      # Issues that have start and due dates
      events += @query.issues(:include => [:tracker, :assigned_to, :priority],
                              :order => "start_date, due_date",
                              :conditions => ["(((start_date>=? and start_date<=?) or (due_date>=? and due_date<=?) or (start_date<? and due_date>?)) and start_date is not null and due_date is not null)", @gantt.date_from, @gantt.date_to, @gantt.date_from, @gantt.date_to, @gantt.date_from, @gantt.date_to]
                              )
      # Issues that don't have a due date but that are assigned to a version with a date
      events += @query.issues(:include => [:tracker, :assigned_to, :priority, :fixed_version],
                              :order => "start_date, effective_date",
                              :conditions => ["(((start_date>=? and start_date<=?) or (effective_date>=? and effective_date<=?) or (start_date<? and effective_date>?)) and start_date is not null and due_date is null and effective_date is not null)", @gantt.date_from, @gantt.date_to, @gantt.date_from, @gantt.date_to, @gantt.date_from, @gantt.date_to]
                              )
      # Versions
      events += @query.versions(:conditions => ["effective_date BETWEEN ? AND ?", @gantt.date_from, @gantt.date_to])
                                   
      @gantt.events = events
    end
    
    basename = (@project ? "#{@project.identifier}-" : '') + 'gantt'
    
    respond_to do |format|
      format.html { render :action => "show", :layout => !request.xhr? }
      format.png  { send_data(@gantt.to_image(@project), :disposition => 'inline', :type => 'image/png', :filename => "#{basename}.png") } if @gantt.respond_to?('to_image')
      format.pdf  { send_data(gantt_to_pdf(@gantt, @project), :type => 'application/pdf', :filename => "#{basename}.pdf") }
    end
  end

  def update
    show
  end

end