Fixed: error when bulk editing with Postgresql

[gitredmine.git] / app / controllers / projects_controller.rb

# redMine - project management software
# Copyright (C) 2006-2007  Jean-Philippe Lang
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
# 
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
# 
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

require 'csv'

class ProjectsController < ApplicationController
  layout 'base'
  before_filter :find_project, :except => [ :index, :list, :add ]
  before_filter :authorize, :except => [ :index, :list, :add, :archive, :unarchive, :destroy ]
  before_filter :require_admin, :only => [ :add, :archive, :unarchive, :destroy ]
  accept_key_auth :activity, :calendar
  
  cache_sweeper :project_sweeper, :only => [ :add, :edit, :archive, :unarchive, :destroy ]
  cache_sweeper :issue_sweeper, :only => [ :add_issue ]
  cache_sweeper :version_sweeper, :only => [ :add_version ]

  helper :sort
  include SortHelper
  helper :custom_fields
  include CustomFieldsHelper   
  helper :ifpdf
  include IfpdfHelper
  helper :issues
  helper IssuesHelper
  helper :queries
  include QueriesHelper
  helper :repositories
  include RepositoriesHelper
  include ProjectsHelper
  
  def index
    list
    render :action => 'list' unless request.xhr?
  end

  # Lists visible projects
  def list
    projects = Project.find :all,
                            :conditions => Project.visible_by(logged_in_user),
                            :include => :parent
    @project_tree = projects.group_by {|p| p.parent || p}
    @project_tree.each_key {|p| @project_tree[p] -= [p]}
  end
  
  # Add a new project
  def add
    @custom_fields = IssueCustomField.find(:all)
    @root_projects = Project.find(:all, :conditions => "parent_id IS NULL AND status = #{Project::STATUS_ACTIVE}")
    @project = Project.new(params[:project])
    @project.enabled_module_names = Redmine::AccessControl.available_project_modules
    if request.get?
      @custom_values = ProjectCustomField.find(:all).collect { |x| CustomValue.new(:custom_field => x, :customized => @project) }
    else
      @project.custom_fields = CustomField.find(params[:custom_field_ids]) if params[:custom_field_ids]
      @custom_values = ProjectCustomField.find(:all).collect { |x| CustomValue.new(:custom_field => x, :customized => @project, :value => (params[:custom_fields] ? params["custom_fields"][x.id.to_s] : nil)) }
      @project.custom_values = @custom_values
      if @project.save
        @project.enabled_module_names = params[:enabled_modules]
        flash[:notice] = l(:notice_successful_create)
        redirect_to :controller => 'admin', :action => 'projects'
          end           
    end 
  end
        
  # Show @project
  def show
    @custom_values = @project.custom_values.find(:all, :include => :custom_field)
    @members_by_role = @project.members.find(:all, :include => [:user, :role], :order => 'position').group_by {|m| m.role}
    @subprojects = @project.active_children
    @news = @project.news.find(:all, :limit => 5, :include => [ :author, :project ], :order => "#{News.table_name}.created_on DESC")
    @trackers = Tracker.find(:all, :order => 'position')
    @open_issues_by_tracker = Issue.count(:group => :tracker, :joins => "INNER JOIN #{IssueStatus.table_name} ON #{IssueStatus.table_name}.id = #{Issue.table_name}.status_id", :conditions => ["project_id=? and #{IssueStatus.table_name}.is_closed=?", @project.id, false])
    @total_issues_by_tracker = Issue.count(:group => :tracker, :conditions => ["project_id=?", @project.id])
    @total_hours = @project.time_entries.sum(:hours)
    @key = User.current.rss_key
  end

  def settings
    @root_projects = Project::find(:all, :conditions => ["parent_id IS NULL AND status = #{Project::STATUS_ACTIVE} AND id <> ?", @project.id])
    @custom_fields = IssueCustomField.find(:all)
    @issue_category ||= IssueCategory.new
    @member ||= @project.members.new
    @custom_values ||= ProjectCustomField.find(:all).collect { |x| @project.custom_values.find_by_custom_field_id(x.id) || CustomValue.new(:custom_field => x) }
    @repository ||= @project.repository
    @wiki ||= @project.wiki
  end
  
  # Edit @project
  def edit
    if request.post?
      @project.custom_fields = IssueCustomField.find(params[:custom_field_ids]) if params[:custom_field_ids]
      if params[:custom_fields]
        @custom_values = ProjectCustomField.find(:all).collect { |x| CustomValue.new(:custom_field => x, :customized => @project, :value => params["custom_fields"][x.id.to_s]) }
        @project.custom_values = @custom_values
      end
      @project.attributes = params[:project]
      if @project.save
        flash[:notice] = l(:notice_successful_update)
        redirect_to :action => 'settings', :id => @project
      else
        settings
        render :action => 'settings'
      end
    end
  end
  
  def modules
    @project.enabled_module_names = params[:enabled_modules]
    redirect_to :action => 'settings', :id => @project, :tab => 'modules'
  end

  def archive
    @project.archive if request.post? && @project.active?
    redirect_to :controller => 'admin', :action => 'projects'
  end
  
  def unarchive
    @project.unarchive if request.post? && !@project.active?
    redirect_to :controller => 'admin', :action => 'projects'
  end
  
  # Delete @project
  def destroy
    @project_to_destroy = @project
    if request.post? and params[:confirm]
      @project_to_destroy.destroy
      redirect_to :controller => 'admin', :action => 'projects'
    end
    # hide project in layout
    @project = nil
  end
        
  # Add a new issue category to @project
  def add_issue_category
    @category = @project.issue_categories.build(params[:category])
    if request.post? and @category.save
          respond_to do |format|
        format.html do
          flash[:notice] = l(:notice_successful_create)
          redirect_to :action => 'settings', :tab => 'categories', :id => @project
        end
        format.js do
          # IE doesn't support the replace_html rjs method for select box options
          render(:update) {|page| page.replace "issue_category_id",
            content_tag('select', '<option></option>' + options_from_collection_for_select(@project.issue_categories, 'id', 'name', @category.id), :id => 'issue_category_id', :name => 'issue[category_id]')
          }
        end
      end
    end
  end
        
  # Add a new version to @project
  def add_version
        @version = @project.versions.build(params[:version])
        if request.post? and @version.save
          flash[:notice] = l(:notice_successful_create)
      redirect_to :action => 'settings', :tab => 'versions', :id => @project
        end
  end

  # Add a new document to @project
  def add_document
    @document = @project.documents.build(params[:document])    
    if request.post? and @document.save 
      # Save the attachments
      params[:attachments].each { |a|
        Attachment.create(:container => @document, :file => a, :author => logged_in_user) unless a.size == 0
      } if params[:attachments] and params[:attachments].is_a? Array
      flash[:notice] = l(:notice_successful_create)
      Mailer.deliver_document_added(@document) if Setting.notified_events.include?('document_added')
      redirect_to :action => 'list_documents', :id => @project
    end
  end
  
  # Show documents list of @project
  def list_documents
    @documents = @project.documents.find :all, :include => :category
  end

  # Add a new issue to @project
  def add_issue
    @tracker = Tracker.find(params[:tracker_id])
    @priorities = Enumeration::get_values('IPRI')
    
    default_status = IssueStatus.default
    unless default_status
      flash.now[:error] = 'No default issue status defined. Please check your configuration.'
      render :nothing => true, :layout => true
      return
    end
    @issue = Issue.new(:project => @project, :tracker => @tracker)    
    @issue.status = default_status
    @allowed_statuses = ([default_status] + default_status.find_new_statuses_allowed_to(logged_in_user.role_for_project(@project), @issue.tracker))if logged_in_user
    if request.get?
      @issue.start_date = Date.today
      @custom_values = @project.custom_fields_for_issues(@tracker).collect { |x| CustomValue.new(:custom_field => x, :customized => @issue) }
    else
      @issue.attributes = params[:issue]
      
      requested_status = IssueStatus.find_by_id(params[:issue][:status_id])
      @issue.status = (@allowed_statuses.include? requested_status) ? requested_status : default_status
      
      @issue.author_id = self.logged_in_user.id if self.logged_in_user
      # Multiple file upload
      @attachments = []
      params[:attachments].each { |a|
        @attachments << Attachment.new(:container => @issue, :file => a, :author => logged_in_user) unless a.size == 0
      } if params[:attachments] and params[:attachments].is_a? Array
      @custom_values = @project.custom_fields_for_issues(@tracker).collect { |x| CustomValue.new(:custom_field => x, :customized => @issue, :value => params["custom_fields"][x.id.to_s]) }
      @issue.custom_values = @custom_values
      if @issue.save
        @attachments.each(&:save)
        flash[:notice] = l(:notice_successful_create)
        Mailer.deliver_issue_add(@issue) if Setting.notified_events.include?('issue_added')
        redirect_to :action => 'list_issues', :id => @project
      end               
    end 
  end

  # Show filtered/sorted issues list of @project
  def list_issues
    sort_init "#{Issue.table_name}.id", "desc"
    sort_update

    retrieve_query

    @results_per_page_options = [ 15, 25, 50, 100 ]
    if params[:per_page] and @results_per_page_options.include? params[:per_page].to_i
      @results_per_page = params[:per_page].to_i
      session[:results_per_page] = @results_per_page
    else
      @results_per_page = session[:results_per_page] || 25
    end

    if @query.valid?
      @issue_count = Issue.count(:include => [:status, :project], :conditions => @query.statement)              
      @issue_pages = Paginator.new self, @issue_count, @results_per_page, params['page']                                                                
      @issues = Issue.find :all, :order => sort_clause,
                                                :include => [ :assigned_to, :status, :tracker, :project, :priority, :category ],
                                                :conditions => @query.statement,
                                                :limit  =>  @issue_pages.items_per_page,
                                                :offset =>  @issue_pages.current.offset                                         
    end
    
    render :layout => false if request.xhr?
  end

  # Export filtered/sorted issues list to CSV
  def export_issues_csv
    sort_init "#{Issue.table_name}.id", "desc"
    sort_update

    retrieve_query
    render :action => 'list_issues' and return unless @query.valid?
                                        
    @issues =  Issue.find :all, :order => sort_clause,
                                                :include => [ :assigned_to, :author, :status, :tracker, :priority, :project, {:custom_values => :custom_field} ],
                                                :conditions => @query.statement,
                                                :limit => Setting.issues_export_limit.to_i

    ic = Iconv.new(l(:general_csv_encoding), 'UTF-8')    
    export = StringIO.new
    CSV::Writer.generate(export, l(:general_csv_separator)) do |csv|
      # csv header fields
      headers = [ "#", l(:field_status), 
                       l(:field_project),
                       l(:field_tracker),
                       l(:field_priority),
                       l(:field_subject),
                       l(:field_assigned_to),
                       l(:field_author),
                       l(:field_start_date),
                       l(:field_due_date),
                       l(:field_done_ratio),
                       l(:field_created_on),
                       l(:field_updated_on)
                       ]
      for custom_field in @project.all_custom_fields
        headers << custom_field.name
      end      
      csv << headers.collect {|c| begin; ic.iconv(c.to_s); rescue; c.to_s; end }
      # csv lines
      @issues.each do |issue|
        fields = [issue.id, issue.status.name, 
                            issue.project.name,
                            issue.tracker.name, 
                            issue.priority.name,
                            issue.subject,
                            (issue.assigned_to ? issue.assigned_to.name : ""),
                            issue.author.name,
                            issue.start_date ? l_date(issue.start_date) : nil,
                            issue.due_date ? l_date(issue.due_date) : nil,
                            issue.done_ratio,
                            l_datetime(issue.created_on),  
                            l_datetime(issue.updated_on)
                            ]
        for custom_field in @project.all_custom_fields
          fields << (show_value issue.custom_value_for(custom_field))
        end
        csv << fields.collect {|c| begin; ic.iconv(c.to_s); rescue; c.to_s; end }
      end
    end
    export.rewind
    send_data(export.read, :type => 'text/csv; header=present', :filename => 'export.csv')
  end
  
  # Export filtered/sorted issues to PDF
  def export_issues_pdf
    sort_init "#{Issue.table_name}.id", "desc"
    sort_update

    retrieve_query
    render :action => 'list_issues' and return unless @query.valid?
                                        
    @issues =  Issue.find :all, :order => sort_clause,
                                                :include => [ :author, :status, :tracker, :priority, :project ],
                                                :conditions => @query.statement,
                                                :limit => Setting.issues_export_limit.to_i
                                                                                        
    @options_for_rfpdf ||= {}
    @options_for_rfpdf[:file_name] = "export.pdf"
    render :layout => false
  end
  
  # Bulk edit issues
  def bulk_edit_issues
    if request.post?
      status = params[:status_id].blank? ? nil : IssueStatus.find_by_id(params[:status_id])
      priority = params[:priority_id].blank? ? nil : Enumeration.find_by_id(params[:priority_id])
      assigned_to = params[:assigned_to_id].blank? ? nil : User.find_by_id(params[:assigned_to_id])
      category = params[:category_id].blank? ? nil : @project.issue_categories.find_by_id(params[:category_id])
      fixed_version = params[:fixed_version_id].blank? ? nil : @project.versions.find_by_id(params[:fixed_version_id])
      issues = @project.issues.find_all_by_id(params[:issue_ids])
      unsaved_issue_ids = []      
      issues.each do |issue|
        journal = issue.init_journal(User.current, params[:notes])
        issue.priority = priority if priority
        issue.assigned_to = assigned_to if assigned_to || params[:assigned_to_id] == 'none'
        issue.category = category if category
        issue.fixed_version = fixed_version if fixed_version
        issue.start_date = params[:start_date] unless params[:start_date].blank?
        issue.due_date = params[:due_date] unless params[:due_date].blank?
        issue.done_ratio = params[:done_ratio] unless params[:done_ratio].blank?
        # Don't save any change to the issue if the user is not authorized to apply the requested status
        if (status.nil? || (issue.status.new_status_allowed_to?(status, current_role, issue.tracker) && issue.status = status)) && issue.save
          # Send notification for each issue (if changed)
          Mailer.deliver_issue_edit(journal) if journal.details.any? && Setting.notified_events.include?('issue_updated')
        else
          # Keep unsaved issue ids to display them in flash error
          unsaved_issue_ids << issue.id
        end
      end
      if unsaved_issue_ids.empty?
        flash[:notice] = l(:notice_successful_update) unless issues.empty?
      else
        flash[:error] = l(:notice_failed_to_save_issues, unsaved_issue_ids.size, issues.size, '#' + unsaved_issue_ids.join(', #'))
      end
      redirect_to :action => 'list_issues', :id => @project
      return
    end
    if current_role && User.current.allowed_to?(:change_issue_status, @project)
      # Find potential statuses the user could be allowed to switch issues to
      @available_statuses = Workflow.find(:all, :include => :new_status,
                                                :conditions => {:role_id => current_role.id}).collect(&:new_status).compact.uniq
    end
    render :update do |page|
      page.hide 'query_form'
      page.replace_html  'bulk-edit', :partial => 'issues/bulk_edit_form'
    end
  end

  def move_issues
    @issues = @project.issues.find(params[:issue_ids]) if params[:issue_ids]
    redirect_to :action => 'list_issues', :id => @project and return unless @issues
    @projects = []
    # find projects to which the user is allowed to move the issue
    User.current.memberships.each {|m| @projects << m.project if m.role.allowed_to?(:controller => 'projects', :action => 'move_issues')}
    # issue can be moved to any tracker
    @trackers = Tracker.find(:all)
    if request.post? and params[:new_project_id] and params[:new_tracker_id]    
      new_project = Project.find_by_id(params[:new_project_id])
      new_tracker = Tracker.find_by_id(params[:new_tracker_id])
      @issues.each do |i|
        if new_project && i.project_id != new_project.id
          # issue is moved to another project
          i.category = nil 
          i.fixed_version = nil
          # delete issue relations
          i.relations_from.clear
          i.relations_to.clear
          i.project = new_project
        end
        if new_tracker        
          i.tracker = new_tracker
        end
        i.save
      end
      flash[:notice] = l(:notice_successful_update)
      redirect_to :action => 'list_issues', :id => @project
    end
  end

  # Add a news to @project
  def add_news
    @news = News.new(:project => @project)
    if request.post?
      @news.attributes = params[:news]
      @news.author_id = self.logged_in_user.id if self.logged_in_user
      if @news.save
        flash[:notice] = l(:notice_successful_create)
        Mailer.deliver_news_added(@news) if Setting.notified_events.include?('news_added')
        redirect_to :action => 'list_news', :id => @project
      end
    end
  end

  # Show news list of @project
  def list_news
    @news_pages, @newss = paginate :news, :per_page => 10, :conditions => ["project_id=?", @project.id], :include => :author, :order => "#{News.table_name}.created_on DESC"
    
    respond_to do |format|
      format.html { render :layout => false if request.xhr? }
      format.atom { render_feed(@newss, :title => "#{@project.name}: #{l(:label_news_plural)}") }
    end
  end

  def add_file
    if request.post?
      @version = @project.versions.find_by_id(params[:version_id])
      # Save the attachments
      @attachments = []
      params[:attachments].each { |file|
        next unless file.size > 0
        a = Attachment.create(:container => @version, :file => file, :author => logged_in_user)
        @attachments << a unless a.new_record?
      } if params[:attachments] and params[:attachments].is_a? Array
      Mailer.deliver_attachments_added(@attachments) if !@attachments.empty? && Setting.notified_events.include?('file_added')
      redirect_to :controller => 'projects', :action => 'list_files', :id => @project
    end
    @versions = @project.versions.sort
  end
  
  def list_files
    @versions = @project.versions.sort
  end
  
  # Show changelog for @project
  def changelog
    @trackers = Tracker.find(:all, :conditions => ["is_in_chlog=?", true], :order => 'position')
    retrieve_selected_tracker_ids(@trackers)    
    @versions = @project.versions.sort
  end

  def roadmap
    @trackers = Tracker.find(:all, :conditions => ["is_in_roadmap=?", true], :order => 'position')
    retrieve_selected_tracker_ids(@trackers)
    @versions = @project.versions.sort
    @versions = @versions.select {|v| !v.completed? } unless params[:completed]
  end
  
  def activity
    if params[:year] and params[:year].to_i > 1900
      @year = params[:year].to_i
      if params[:month] and params[:month].to_i > 0 and params[:month].to_i < 13
        @month = params[:month].to_i
      end    
    end
    @year ||= Date.today.year
    @month ||= Date.today.month

    case params[:format]
    when 'atom'
      # 30 last days
      @date_from = Date.today - 30
      @date_to = Date.today + 1
    else
      # current month
      @date_from = Date.civil(@year, @month, 1)
      @date_to = @date_from >> 1
    end
    
    @event_types = %w(issues news files documents wiki_pages changesets)
    @event_types.delete('wiki_pages') unless @project.wiki
    @event_types.delete('changesets') unless @project.repository
    # only show what the user is allowed to view
    @event_types = @event_types.select {|o| User.current.allowed_to?("view_#{o}".to_sym, @project)}
    
    @scope = @event_types.select {|t| params["show_#{t}"]}
    # default events if none is specified in parameters
    @scope = (@event_types - %w(wiki_pages))if @scope.empty?
    
    @events = []    
    
    if @scope.include?('issues')
      @events += @project.issues.find(:all, :include => [:author, :tracker], :conditions => ["#{Issue.table_name}.created_on>=? and #{Issue.table_name}.created_on<=?", @date_from, @date_to] )
    end
    
    if @scope.include?('news')
      @events += @project.news.find(:all, :conditions => ["#{News.table_name}.created_on>=? and #{News.table_name}.created_on<=?", @date_from, @date_to], :include => :author )
    end
    
    if @scope.include?('files')
      @events += Attachment.find(:all, :select => "#{Attachment.table_name}.*", :joins => "LEFT JOIN #{Version.table_name} ON #{Version.table_name}.id = #{Attachment.table_name}.container_id", :conditions => ["#{Attachment.table_name}.container_type='Version' and #{Version.table_name}.project_id=? and #{Attachment.table_name}.created_on>=? and #{Attachment.table_name}.created_on<=?", @project.id, @date_from, @date_to], :include => :author )
    end
    
    if @scope.include?('documents')
      @events += @project.documents.find(:all, :conditions => ["#{Document.table_name}.created_on>=? and #{Document.table_name}.created_on<=?", @date_from, @date_to] )
      @events += Attachment.find(:all, :select => "attachments.*", :joins => "LEFT JOIN #{Document.table_name} ON #{Document.table_name}.id = #{Attachment.table_name}.container_id", :conditions => ["#{Attachment.table_name}.container_type='Document' and #{Document.table_name}.project_id=? and #{Attachment.table_name}.created_on>=? and #{Attachment.table_name}.created_on<=?", @project.id, @date_from, @date_to], :include => :author )
    end
    
    if @scope.include?('wiki_pages')
      select = "#{WikiContent.versioned_table_name}.updated_on, #{WikiContent.versioned_table_name}.comments, " +
               "#{WikiContent.versioned_table_name}.#{WikiContent.version_column}, #{WikiPage.table_name}.title, " +
               "#{WikiContent.versioned_table_name}.page_id, #{WikiContent.versioned_table_name}.author_id, " +
               "#{WikiContent.versioned_table_name}.id"
      joins = "LEFT JOIN #{WikiPage.table_name} ON #{WikiPage.table_name}.id = #{WikiContent.versioned_table_name}.page_id " +
              "LEFT JOIN #{Wiki.table_name} ON #{Wiki.table_name}.id = #{WikiPage.table_name}.wiki_id "
      conditions = ["#{Wiki.table_name}.project_id = ? AND #{WikiContent.versioned_table_name}.updated_on BETWEEN ? AND ?",
                    @project.id, @date_from, @date_to]

      @events += WikiContent.versioned_class.find(:all, :select => select, :joins => joins, :conditions => conditions)
    end

    if @scope.include?('changesets')
      @events += @project.repository.changesets.find(:all, :conditions => ["#{Changeset.table_name}.committed_on BETWEEN ? AND ?", @date_from, @date_to])
    end
    
    @events_by_day = @events.group_by(&:event_date)
    
    respond_to do |format|
      format.html { render :layout => false if request.xhr? }
      format.atom { render_feed(@events, :title => "#{@project.name}: #{l(:label_activity)}") }
    end
  end
  
  def calendar
    @trackers = Tracker.find(:all, :order => 'position')
    retrieve_selected_tracker_ids(@trackers)
    
    if params[:year] and params[:year].to_i > 1900
      @year = params[:year].to_i
      if params[:month] and params[:month].to_i > 0 and params[:month].to_i < 13
        @month = params[:month].to_i
      end    
    end
    @year ||= Date.today.year
    @month ||= Date.today.month    
    @calendar = Redmine::Helpers::Calendar.new(Date.civil(@year, @month, 1), current_language, :month)
    
    events = []
    @project.issues_with_subprojects(params[:with_subprojects]) do
      events += Issue.find(:all, 
                           :include => [:tracker, :status, :assigned_to, :priority, :project], 
                           :conditions => ["((start_date BETWEEN ? AND ?) OR (due_date BETWEEN ? AND ?)) AND #{Issue.table_name}.tracker_id IN (#{@selected_tracker_ids.join(',')})", @calendar.startdt, @calendar.enddt, @calendar.startdt, @calendar.enddt]
                           ) unless @selected_tracker_ids.empty?
    end
    events += @project.versions.find(:all, :conditions => ["effective_date BETWEEN ? AND ?", @calendar.startdt, @calendar.enddt])
    @calendar.events = events
    
    render :layout => false if request.xhr?
  end  

  def gantt
    @trackers = Tracker.find(:all, :order => 'position')
    retrieve_selected_tracker_ids(@trackers)
    
    if params[:year] and params[:year].to_i >0
      @year_from = params[:year].to_i
      if params[:month] and params[:month].to_i >=1 and params[:month].to_i <= 12
        @month_from = params[:month].to_i
      else
        @month_from = 1
      end
    else
      @month_from ||= Date.today.month
      @year_from ||= Date.today.year
    end
    
    zoom = (params[:zoom] || User.current.pref[:gantt_zoom]).to_i
    @zoom = (zoom > 0 && zoom < 5) ? zoom : 2    
    months = (params[:months] || User.current.pref[:gantt_months]).to_i
    @months = (months > 0 && months < 25) ? months : 6
    
    # Save gantt paramters as user preference (zoom and months count)
    if (User.current.logged? && (@zoom != User.current.pref[:gantt_zoom] || @months != User.current.pref[:gantt_months]))
      User.current.pref[:gantt_zoom], User.current.pref[:gantt_months] = @zoom, @months
      User.current.preference.save
    end
    
    @date_from = Date.civil(@year_from, @month_from, 1)
    @date_to = (@date_from >> @months) - 1
    
    @events = []
    @project.issues_with_subprojects(params[:with_subprojects]) do
      @events += Issue.find(:all, 
                           :order => "start_date, due_date",
                           :include => [:tracker, :status, :assigned_to, :priority, :project], 
                           :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 and #{Issue.table_name}.tracker_id in (#{@selected_tracker_ids.join(',')}))", @date_from, @date_to, @date_from, @date_to, @date_from, @date_to]
                           ) unless @selected_tracker_ids.empty?
    end
    @events += @project.versions.find(:all, :conditions => ["effective_date BETWEEN ? AND ?", @date_from, @date_to])
    @events.sort! {|x,y| x.start_date <=> y.start_date }
    
    if params[:format]=='pdf'
      @options_for_rfpdf ||= {}
      @options_for_rfpdf[:file_name] = "#{@project.identifier}-gantt.pdf"
      render :template => "projects/gantt.rfpdf", :layout => false
    elsif params[:format]=='png' && respond_to?('gantt_image')
      image = gantt_image(@events, @date_from, @months, @zoom)
      image.format = 'PNG'
      send_data(image.to_blob, :disposition => 'inline', :type => 'image/png', :filename => "#{@project.identifier}-gantt.png")
    else
      render :template => "projects/gantt.rhtml"
    end
  end
  
private
  # Find project of id params[:id]
  # if not found, redirect to project list
  # Used as a before_filter
  def find_project
    @project = Project.find(params[:id])
  rescue ActiveRecord::RecordNotFound
    render_404
  end
  
  def retrieve_selected_tracker_ids(selectable_trackers)
    if ids = params[:tracker_ids]
      @selected_tracker_ids = (ids.is_a? Array) ? ids.collect { |id| id.to_i.to_s } : ids.split('/').collect { |id| id.to_i.to_s }
    else
      @selected_tracker_ids = selectable_trackers.collect {|t| t.id.to_s }
    end
  end
  
  # Retrieve query from session or build a new query
  def retrieve_query
    if params[:query_id]
      @query = @project.queries.find(params[:query_id])
      @query.executed_by = logged_in_user
      session[:query] = @query
    else
      if params[:set_filter] or !session[:query] or session[:query].project_id != @project.id
        # Give it a name, required to be valid
        @query = Query.new(:name => "_", :executed_by => logged_in_user)
        @query.project = @project
        if params[:fields] and params[:fields].is_a? Array
          params[:fields].each do |field|
            @query.add_filter(field, params[:operators][field], params[:values][field])
          end
        else
          @query.available_filters.keys.each do |field|
            @query.add_short_filter(field, params[field]) if params[field]
          end
        end
        session[:query] = @query
      else
        @query = session[:query]
      end
    end  
  end
end