diff app/models/issue.rb @ 0:513646585e45

* Import Redmine trunk SVN rev 3859

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/app/models/issue.rb	Fri Jul 23 15:52:44 2010 +0100
@@ -0,0 +1,833 @@
+# 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.
+
+class Issue < ActiveRecord::Base
+  belongs_to :project
+  belongs_to :tracker
+  belongs_to :status, :class_name => 'IssueStatus', :foreign_key => 'status_id'
+  belongs_to :author, :class_name => 'User', :foreign_key => 'author_id'
+  belongs_to :assigned_to, :class_name => 'User', :foreign_key => 'assigned_to_id'
+  belongs_to :fixed_version, :class_name => 'Version', :foreign_key => 'fixed_version_id'
+  belongs_to :priority, :class_name => 'IssuePriority', :foreign_key => 'priority_id'
+  belongs_to :category, :class_name => 'IssueCategory', :foreign_key => 'category_id'
+
+  has_many :journals, :as => :journalized, :dependent => :destroy
+  has_many :time_entries, :dependent => :delete_all
+  has_and_belongs_to_many :changesets, :order => "#{Changeset.table_name}.committed_on ASC, #{Changeset.table_name}.id ASC"
+  
+  has_many :relations_from, :class_name => 'IssueRelation', :foreign_key => 'issue_from_id', :dependent => :delete_all
+  has_many :relations_to, :class_name => 'IssueRelation', :foreign_key => 'issue_to_id', :dependent => :delete_all
+  
+  acts_as_nested_set :scope => 'root_id'
+  acts_as_attachable :after_remove => :attachment_removed
+  acts_as_customizable
+  acts_as_watchable
+  acts_as_searchable :columns => ['subject', "#{table_name}.description", "#{Journal.table_name}.notes"],
+                     :include => [:project, :journals],
+                     # sort by id so that limited eager loading doesn't break with postgresql
+                     :order_column => "#{table_name}.id"
+  acts_as_event :title => Proc.new {|o| "#{o.tracker.name} ##{o.id} (#{o.status}): #{o.subject}"},
+                :url => Proc.new {|o| {:controller => 'issues', :action => 'show', :id => o.id}},
+                :type => Proc.new {|o| 'issue' + (o.closed? ? ' closed' : '') }
+  
+  acts_as_activity_provider :find_options => {:include => [:project, :author, :tracker]},
+                            :author_key => :author_id
+
+  DONE_RATIO_OPTIONS = %w(issue_field issue_status)
+
+  attr_reader :current_journal
+
+  validates_presence_of :subject, :priority, :project, :tracker, :author, :status
+
+  validates_length_of :subject, :maximum => 255
+  validates_inclusion_of :done_ratio, :in => 0..100
+  validates_numericality_of :estimated_hours, :allow_nil => true
+
+  named_scope :visible, lambda {|*args| { :include => :project,
+                                          :conditions => Project.allowed_to_condition(args.first || User.current, :view_issues) } }
+  
+  named_scope :open, :conditions => ["#{IssueStatus.table_name}.is_closed = ?", false], :include => :status
+
+  named_scope :recently_updated, :order => "#{self.table_name}.updated_on DESC"
+  named_scope :with_limit, lambda { |limit| { :limit => limit} }
+  named_scope :on_active_project, :include => [:status, :project, :tracker],
+                                  :conditions => ["#{Project.table_name}.status=#{Project::STATUS_ACTIVE}"]
+
+  before_create :default_assign
+  before_save :reschedule_following_issues, :close_duplicates, :update_done_ratio_from_issue_status
+  after_save :update_nested_set_attributes, :update_parent_attributes, :create_journal
+  after_destroy :destroy_children
+  after_destroy :update_parent_attributes
+  
+  # Returns true if usr or current user is allowed to view the issue
+  def visible?(usr=nil)
+    (usr || User.current).allowed_to?(:view_issues, self.project)
+  end
+  
+  def after_initialize
+    if new_record?
+      # set default values for new records only
+      self.status ||= IssueStatus.default
+      self.priority ||= IssuePriority.default
+    end
+  end
+  
+  # Overrides Redmine::Acts::Customizable::InstanceMethods#available_custom_fields
+  def available_custom_fields
+    (project && tracker) ? project.all_issue_custom_fields.select {|c| tracker.custom_fields.include? c } : []
+  end
+  
+  def copy_from(arg)
+    issue = arg.is_a?(Issue) ? arg : Issue.visible.find(arg)
+    self.attributes = issue.attributes.dup.except("id", "root_id", "parent_id", "lft", "rgt", "created_on", "updated_on")
+    self.custom_field_values = issue.custom_field_values.inject({}) {|h,v| h[v.custom_field_id] = v.value; h}
+    self.status = issue.status
+    self
+  end
+  
+  # Moves/copies an issue to a new project and tracker
+  # Returns the moved/copied issue on success, false on failure
+  def move_to_project(*args)
+    ret = Issue.transaction do
+      move_to_project_without_transaction(*args) || raise(ActiveRecord::Rollback)
+    end || false
+  end
+  
+  def move_to_project_without_transaction(new_project, new_tracker = nil, options = {})
+    options ||= {}
+    issue = options[:copy] ? self.class.new.copy_from(self) : self
+    
+    if new_project && issue.project_id != new_project.id
+      # delete issue relations
+      unless Setting.cross_project_issue_relations?
+        issue.relations_from.clear
+        issue.relations_to.clear
+      end
+      # issue is moved to another project
+      # reassign to the category with same name if any
+      new_category = issue.category.nil? ? nil : new_project.issue_categories.find_by_name(issue.category.name)
+      issue.category = new_category
+      # Keep the fixed_version if it's still valid in the new_project
+      unless new_project.shared_versions.include?(issue.fixed_version)
+        issue.fixed_version = nil
+      end
+      issue.project = new_project
+      if issue.parent && issue.parent.project_id != issue.project_id
+        issue.parent_issue_id = nil
+      end
+    end
+    if new_tracker
+      issue.tracker = new_tracker
+      issue.reset_custom_values!
+    end
+    if options[:copy]
+      issue.custom_field_values = self.custom_field_values.inject({}) {|h,v| h[v.custom_field_id] = v.value; h}
+      issue.status = if options[:attributes] && options[:attributes][:status_id]
+                       IssueStatus.find_by_id(options[:attributes][:status_id])
+                     else
+                       self.status
+                     end
+    end
+    # Allow bulk setting of attributes on the issue
+    if options[:attributes]
+      issue.attributes = options[:attributes]
+    end
+    if issue.save
+      unless options[:copy]
+        # Manually update project_id on related time entries
+        TimeEntry.update_all("project_id = #{new_project.id}", {:issue_id => id})
+        
+        issue.children.each do |child|
+          unless child.move_to_project_without_transaction(new_project)
+            # Move failed and transaction was rollback'd
+            return false
+          end
+        end
+      end
+    else
+      return false
+    end
+    issue
+  end
+
+  def status_id=(sid)
+    self.status = nil
+    write_attribute(:status_id, sid)
+  end
+  
+  def priority_id=(pid)
+    self.priority = nil
+    write_attribute(:priority_id, pid)
+  end
+
+  def tracker_id=(tid)
+    self.tracker = nil
+    result = write_attribute(:tracker_id, tid)
+    @custom_field_values = nil
+    result
+  end
+  
+  # Overrides attributes= so that tracker_id gets assigned first
+  def attributes_with_tracker_first=(new_attributes, *args)
+    return if new_attributes.nil?
+    new_tracker_id = new_attributes['tracker_id'] || new_attributes[:tracker_id]
+    if new_tracker_id
+      self.tracker_id = new_tracker_id
+    end
+    send :attributes_without_tracker_first=, new_attributes, *args
+  end
+  # Do not redefine alias chain on reload (see #4838)
+  alias_method_chain(:attributes=, :tracker_first) unless method_defined?(:attributes_without_tracker_first=)
+  
+  def estimated_hours=(h)
+    write_attribute :estimated_hours, (h.is_a?(String) ? h.to_hours : h)
+  end
+  
+  SAFE_ATTRIBUTES = %w(
+    tracker_id
+    status_id
+    parent_issue_id
+    category_id
+    assigned_to_id
+    priority_id
+    fixed_version_id
+    subject
+    description
+    start_date
+    due_date
+    done_ratio
+    estimated_hours
+    custom_field_values
+    lock_version
+  ) unless const_defined?(:SAFE_ATTRIBUTES)
+  
+  # Safely sets attributes
+  # Should be called from controllers instead of #attributes=
+  # attr_accessible is too rough because we still want things like
+  # Issue.new(:project => foo) to work
+  # TODO: move workflow/permission checks from controllers to here
+  def safe_attributes=(attrs, user=User.current)
+    return if attrs.nil?
+    attrs = attrs.reject {|k,v| !SAFE_ATTRIBUTES.include?(k)}
+    if attrs['status_id']
+      unless new_statuses_allowed_to(user).collect(&:id).include?(attrs['status_id'].to_i)
+        attrs.delete('status_id')
+      end
+    end
+    
+    unless leaf?
+      attrs.reject! {|k,v| %w(priority_id done_ratio start_date due_date estimated_hours).include?(k)}
+    end
+    
+    if attrs.has_key?('parent_issue_id')
+      if !user.allowed_to?(:manage_subtasks, project)
+        attrs.delete('parent_issue_id')
+      elsif !attrs['parent_issue_id'].blank?
+        attrs.delete('parent_issue_id') unless Issue.visible(user).exists?(attrs['parent_issue_id'])
+      end
+    end
+    
+    self.attributes = attrs
+  end
+  
+  def done_ratio
+    if Issue.use_status_for_done_ratio? && status && status.default_done_ratio?
+      status.default_done_ratio
+    else
+      read_attribute(:done_ratio)
+    end
+  end
+
+  def self.use_status_for_done_ratio?
+    Setting.issue_done_ratio == 'issue_status'
+  end
+
+  def self.use_field_for_done_ratio?
+    Setting.issue_done_ratio == 'issue_field'
+  end
+  
+  def validate
+    if self.due_date.nil? && @attributes['due_date'] && !@attributes['due_date'].empty?
+      errors.add :due_date, :not_a_date
+    end
+    
+    if self.due_date and self.start_date and self.due_date < self.start_date
+      errors.add :due_date, :greater_than_start_date
+    end
+    
+    if start_date && soonest_start && start_date < soonest_start
+      errors.add :start_date, :invalid
+    end
+    
+    if fixed_version
+      if !assignable_versions.include?(fixed_version)
+        errors.add :fixed_version_id, :inclusion
+      elsif reopened? && fixed_version.closed?
+        errors.add_to_base I18n.t(:error_can_not_reopen_issue_on_closed_version)
+      end
+    end
+    
+    # Checks that the issue can not be added/moved to a disabled tracker
+    if project && (tracker_id_changed? || project_id_changed?)
+      unless project.trackers.include?(tracker)
+        errors.add :tracker_id, :inclusion
+      end
+    end
+    
+    # Checks parent issue assignment
+    if @parent_issue
+      if @parent_issue.project_id != project_id
+        errors.add :parent_issue_id, :not_same_project
+      elsif !new_record?
+        # moving an existing issue
+        if @parent_issue.root_id != root_id
+          # we can always move to another tree
+        elsif move_possible?(@parent_issue)
+          # move accepted inside tree
+        else
+          errors.add :parent_issue_id, :not_a_valid_parent
+        end
+      end
+    end
+  end
+  
+  # Set the done_ratio using the status if that setting is set.  This will keep the done_ratios
+  # even if the user turns off the setting later
+  def update_done_ratio_from_issue_status
+    if Issue.use_status_for_done_ratio? && status && status.default_done_ratio?
+      self.done_ratio = status.default_done_ratio
+    end
+  end
+  
+  def init_journal(user, notes = "")
+    @current_journal ||= Journal.new(:journalized => self, :user => user, :notes => notes)
+    @issue_before_change = self.clone
+    @issue_before_change.status = self.status
+    @custom_values_before_change = {}
+    self.custom_values.each {|c| @custom_values_before_change.store c.custom_field_id, c.value }
+    # Make sure updated_on is updated when adding a note.
+    updated_on_will_change!
+    @current_journal
+  end
+  
+  # Return true if the issue is closed, otherwise false
+  def closed?
+    self.status.is_closed?
+  end
+  
+  # Return true if the issue is being reopened
+  def reopened?
+    if !new_record? && status_id_changed?
+      status_was = IssueStatus.find_by_id(status_id_was)
+      status_new = IssueStatus.find_by_id(status_id)
+      if status_was && status_new && status_was.is_closed? && !status_new.is_closed?
+        return true
+      end
+    end
+    false
+  end
+
+  # Return true if the issue is being closed
+  def closing?
+    if !new_record? && status_id_changed?
+      status_was = IssueStatus.find_by_id(status_id_was)
+      status_new = IssueStatus.find_by_id(status_id)
+      if status_was && status_new && !status_was.is_closed? && status_new.is_closed?
+        return true
+      end
+    end
+    false
+  end
+  
+  # Returns true if the issue is overdue
+  def overdue?
+    !due_date.nil? && (due_date < Date.today) && !status.is_closed?
+  end
+  
+  # Users the issue can be assigned to
+  def assignable_users
+    project.assignable_users
+  end
+  
+  # Versions that the issue can be assigned to
+  def assignable_versions
+    @assignable_versions ||= (project.shared_versions.open + [Version.find_by_id(fixed_version_id_was)]).compact.uniq.sort
+  end
+  
+  # Returns true if this issue is blocked by another issue that is still open
+  def blocked?
+    !relations_to.detect {|ir| ir.relation_type == 'blocks' && !ir.issue_from.closed?}.nil?
+  end
+  
+  # Returns an array of status that user is able to apply
+  def new_statuses_allowed_to(user, include_default=false)
+    statuses = status.find_new_statuses_allowed_to(user.roles_for_project(project), tracker)
+    statuses << status unless statuses.empty?
+    statuses << IssueStatus.default if include_default
+    statuses = statuses.uniq.sort
+    blocked? ? statuses.reject {|s| s.is_closed?} : statuses
+  end
+  
+  # Returns the mail adresses of users that should be notified
+  def recipients
+    notified = project.notified_users
+    # Author and assignee are always notified unless they have been locked
+    notified << author if author && author.active?
+    notified << assigned_to if assigned_to && assigned_to.active?
+    notified.uniq!
+    # Remove users that can not view the issue
+    notified.reject! {|user| !visible?(user)}
+    notified.collect(&:mail)
+  end
+  
+  # Returns the total number of hours spent on this issue and its descendants
+  #
+  # Example:
+  #   spent_hours => 0.0
+  #   spent_hours => 50.2
+  def spent_hours
+    @spent_hours ||= self_and_descendants.sum("#{TimeEntry.table_name}.hours", :include => :time_entries).to_f || 0.0
+  end
+  
+  def relations
+    (relations_from + relations_to).sort
+  end
+  
+  def all_dependent_issues
+    dependencies = []
+    relations_from.each do |relation|
+      dependencies << relation.issue_to
+      dependencies += relation.issue_to.all_dependent_issues
+    end
+    dependencies
+  end
+  
+  # Returns an array of issues that duplicate this one
+  def duplicates
+    relations_to.select {|r| r.relation_type == IssueRelation::TYPE_DUPLICATES}.collect {|r| r.issue_from}
+  end
+  
+  # Returns the due date or the target due date if any
+  # Used on gantt chart
+  def due_before
+    due_date || (fixed_version ? fixed_version.effective_date : nil)
+  end
+  
+  # Returns the time scheduled for this issue.
+  # 
+  # Example:
+  #   Start Date: 2/26/09, End Date: 3/04/09
+  #   duration => 6
+  def duration
+    (start_date && due_date) ? due_date - start_date : 0
+  end
+  
+  def soonest_start
+    @soonest_start ||= (
+        relations_to.collect{|relation| relation.successor_soonest_start} +
+        ancestors.collect(&:soonest_start)
+      ).compact.max
+  end
+  
+  def reschedule_after(date)
+    return if date.nil?
+    if leaf?
+      if start_date.nil? || start_date < date
+        self.start_date, self.due_date = date, date + duration
+        save
+      end
+    else
+      leaves.each do |leaf|
+        leaf.reschedule_after(date)
+      end
+    end
+  end
+  
+  def <=>(issue)
+    if issue.nil?
+      -1
+    elsif root_id != issue.root_id
+      (root_id || 0) <=> (issue.root_id || 0)
+    else
+      (lft || 0) <=> (issue.lft || 0)
+    end
+  end
+  
+  def to_s
+    "#{tracker} ##{id}: #{subject}"
+  end
+  
+  # Returns a string of css classes that apply to the issue
+  def css_classes
+    s = "issue status-#{status.position} priority-#{priority.position}"
+    s << ' closed' if closed?
+    s << ' overdue' if overdue?
+    s << ' created-by-me' if User.current.logged? && author_id == User.current.id
+    s << ' assigned-to-me' if User.current.logged? && assigned_to_id == User.current.id
+    s
+  end
+
+  # Saves an issue, time_entry, attachments, and a journal from the parameters
+  # Returns false if save fails
+  def save_issue_with_child_records(params, existing_time_entry=nil)
+    Issue.transaction do
+      if params[:time_entry] && params[:time_entry][:hours].present? && User.current.allowed_to?(:log_time, project)
+        @time_entry = existing_time_entry || TimeEntry.new
+        @time_entry.project = project
+        @time_entry.issue = self
+        @time_entry.user = User.current
+        @time_entry.spent_on = Date.today
+        @time_entry.attributes = params[:time_entry]
+        self.time_entries << @time_entry
+      end
+  
+      if valid?
+        attachments = Attachment.attach_files(self, params[:attachments])
+  
+        attachments[:files].each {|a| @current_journal.details << JournalDetail.new(:property => 'attachment', :prop_key => a.id, :value => a.filename)}
+        # TODO: Rename hook
+        Redmine::Hook.call_hook(:controller_issues_edit_before_save, { :params => params, :issue => self, :time_entry => @time_entry, :journal => @current_journal})
+        begin
+          if save
+            # TODO: Rename hook
+            Redmine::Hook.call_hook(:controller_issues_edit_after_save, { :params => params, :issue => self, :time_entry => @time_entry, :journal => @current_journal})
+          else
+            raise ActiveRecord::Rollback
+          end
+        rescue ActiveRecord::StaleObjectError
+          attachments[:files].each(&:destroy)
+          errors.add_to_base l(:notice_locking_conflict)
+          raise ActiveRecord::Rollback
+        end
+      end
+    end
+  end
+
+  # Unassigns issues from +version+ if it's no longer shared with issue's project
+  def self.update_versions_from_sharing_change(version)
+    # Update issues assigned to the version
+    update_versions(["#{Issue.table_name}.fixed_version_id = ?", version.id])
+  end
+  
+  # Unassigns issues from versions that are no longer shared
+  # after +project+ was moved
+  def self.update_versions_from_hierarchy_change(project)
+    moved_project_ids = project.self_and_descendants.reload.collect(&:id)
+    # Update issues of the moved projects and issues assigned to a version of a moved project
+    Issue.update_versions(["#{Version.table_name}.project_id IN (?) OR #{Issue.table_name}.project_id IN (?)", moved_project_ids, moved_project_ids])
+  end
+
+  def parent_issue_id=(arg)
+    parent_issue_id = arg.blank? ? nil : arg.to_i
+    if parent_issue_id && @parent_issue = Issue.find_by_id(parent_issue_id)
+      @parent_issue.id
+    else
+      @parent_issue = nil
+      nil
+    end
+  end
+  
+  def parent_issue_id
+    if instance_variable_defined? :@parent_issue
+      @parent_issue.nil? ? nil : @parent_issue.id
+    else
+      parent_id
+    end
+  end
+
+  # Extracted from the ReportsController.
+  def self.by_tracker(project)
+    count_and_group_by(:project => project,
+                       :field => 'tracker_id',
+                       :joins => Tracker.table_name)
+  end
+
+  def self.by_version(project)
+    count_and_group_by(:project => project,
+                       :field => 'fixed_version_id',
+                       :joins => Version.table_name)
+  end
+
+  def self.by_priority(project)
+    count_and_group_by(:project => project,
+                       :field => 'priority_id',
+                       :joins => IssuePriority.table_name)
+  end
+
+  def self.by_category(project)
+    count_and_group_by(:project => project,
+                       :field => 'category_id',
+                       :joins => IssueCategory.table_name)
+  end
+
+  def self.by_assigned_to(project)
+    count_and_group_by(:project => project,
+                       :field => 'assigned_to_id',
+                       :joins => User.table_name)
+  end
+
+  def self.by_author(project)
+    count_and_group_by(:project => project,
+                       :field => 'author_id',
+                       :joins => User.table_name)
+  end
+
+  def self.by_subproject(project)
+    ActiveRecord::Base.connection.select_all("select    s.id as status_id, 
+                                                s.is_closed as closed, 
+                                                i.project_id as project_id,
+                                                count(i.id) as total 
+                                              from 
+                                                #{Issue.table_name} i, #{IssueStatus.table_name} s
+                                              where 
+                                                i.status_id=s.id 
+                                                and i.project_id IN (#{project.descendants.active.collect{|p| p.id}.join(',')})
+                                              group by s.id, s.is_closed, i.project_id") if project.descendants.active.any?
+  end
+  # End ReportsController extraction
+  
+  # Returns an array of projects that current user can move issues to
+  def self.allowed_target_projects_on_move
+    projects = []
+    if User.current.admin?
+      # admin is allowed to move issues to any active (visible) project
+      projects = Project.visible.all
+    elsif User.current.logged?
+      if Role.non_member.allowed_to?(:move_issues)
+        projects = Project.visible.all
+      else
+        User.current.memberships.each {|m| projects << m.project if m.roles.detect {|r| r.allowed_to?(:move_issues)}}
+      end
+    end
+    projects
+  end
+   
+  private
+  
+  def update_nested_set_attributes
+    if root_id.nil?
+      # issue was just created
+      self.root_id = (@parent_issue.nil? ? id : @parent_issue.root_id)
+      set_default_left_and_right
+      Issue.update_all("root_id = #{root_id}, lft = #{lft}, rgt = #{rgt}", ["id = ?", id])
+      if @parent_issue
+        move_to_child_of(@parent_issue)
+      end
+      reload
+    elsif parent_issue_id != parent_id
+      former_parent_id = parent_id
+      # moving an existing issue
+      if @parent_issue && @parent_issue.root_id == root_id
+        # inside the same tree
+        move_to_child_of(@parent_issue)
+      else
+        # to another tree
+        unless root?
+          move_to_right_of(root)
+          reload
+        end
+        old_root_id = root_id
+        self.root_id = (@parent_issue.nil? ? id : @parent_issue.root_id )
+        target_maxright = nested_set_scope.maximum(right_column_name) || 0
+        offset = target_maxright + 1 - lft
+        Issue.update_all("root_id = #{root_id}, lft = lft + #{offset}, rgt = rgt + #{offset}",
+                          ["root_id = ? AND lft >= ? AND rgt <= ? ", old_root_id, lft, rgt])
+        self[left_column_name] = lft + offset
+        self[right_column_name] = rgt + offset
+        if @parent_issue
+          move_to_child_of(@parent_issue)
+        end
+      end
+      reload
+      # delete invalid relations of all descendants
+      self_and_descendants.each do |issue|
+        issue.relations.each do |relation|
+          relation.destroy unless relation.valid?
+        end
+      end
+      # update former parent
+      recalculate_attributes_for(former_parent_id) if former_parent_id
+    end
+    remove_instance_variable(:@parent_issue) if instance_variable_defined?(:@parent_issue)
+  end
+  
+  def update_parent_attributes
+    recalculate_attributes_for(parent_id) if parent_id
+  end
+
+  def recalculate_attributes_for(issue_id)
+    if issue_id && p = Issue.find_by_id(issue_id)
+      # priority = highest priority of children
+      if priority_position = p.children.maximum("#{IssuePriority.table_name}.position", :include => :priority)
+        p.priority = IssuePriority.find_by_position(priority_position)
+      end
+      
+      # start/due dates = lowest/highest dates of children
+      p.start_date = p.children.minimum(:start_date)
+      p.due_date = p.children.maximum(:due_date)
+      if p.start_date && p.due_date && p.due_date < p.start_date
+        p.start_date, p.due_date = p.due_date, p.start_date
+      end
+      
+      # done ratio = weighted average ratio of leaves
+      unless Issue.use_status_for_done_ratio? && p.status && p.status.default_done_ratio?
+        leaves_count = p.leaves.count
+        if leaves_count > 0
+          average = p.leaves.average(:estimated_hours).to_f
+          if average == 0
+            average = 1
+          end
+          done = p.leaves.sum("COALESCE(estimated_hours, #{average}) * (CASE WHEN is_closed = #{connection.quoted_true} THEN 100 ELSE COALESCE(done_ratio, 0) END)", :include => :status).to_f
+          progress = done / (average * leaves_count)
+          p.done_ratio = progress.round
+        end
+      end
+      
+      # estimate = sum of leaves estimates
+      p.estimated_hours = p.leaves.sum(:estimated_hours).to_f
+      p.estimated_hours = nil if p.estimated_hours == 0.0
+      
+      # ancestors will be recursively updated
+      p.save(false)
+    end
+  end
+  
+  def destroy_children
+    unless leaf?
+      children.each do |child|
+        child.destroy
+      end
+    end
+  end
+  
+  # Update issues so their versions are not pointing to a
+  # fixed_version that is not shared with the issue's project
+  def self.update_versions(conditions=nil)
+    # Only need to update issues with a fixed_version from
+    # a different project and that is not systemwide shared
+    Issue.all(:conditions => merge_conditions("#{Issue.table_name}.fixed_version_id IS NOT NULL" +
+                                                " AND #{Issue.table_name}.project_id <> #{Version.table_name}.project_id" +
+                                                " AND #{Version.table_name}.sharing <> 'system'",
+                                                conditions),
+              :include => [:project, :fixed_version]
+              ).each do |issue|
+      next if issue.project.nil? || issue.fixed_version.nil?
+      unless issue.project.shared_versions.include?(issue.fixed_version)
+        issue.init_journal(User.current)
+        issue.fixed_version = nil
+        issue.save
+      end
+    end
+  end
+  
+  # Callback on attachment deletion
+  def attachment_removed(obj)
+    journal = init_journal(User.current)
+    journal.details << JournalDetail.new(:property => 'attachment',
+                                         :prop_key => obj.id,
+                                         :old_value => obj.filename)
+    journal.save
+  end
+  
+  # Default assignment based on category
+  def default_assign
+    if assigned_to.nil? && category && category.assigned_to
+      self.assigned_to = category.assigned_to
+    end
+  end
+
+  # Updates start/due dates of following issues
+  def reschedule_following_issues
+    if start_date_changed? || due_date_changed?
+      relations_from.each do |relation|
+        relation.set_issue_to_dates
+      end
+    end
+  end
+
+  # Closes duplicates if the issue is being closed
+  def close_duplicates
+    if closing?
+      duplicates.each do |duplicate|
+        # Reload is need in case the duplicate was updated by a previous duplicate
+        duplicate.reload
+        # Don't re-close it if it's already closed
+        next if duplicate.closed?
+        # Same user and notes
+        if @current_journal
+          duplicate.init_journal(@current_journal.user, @current_journal.notes)
+        end
+        duplicate.update_attribute :status, self.status
+      end
+    end
+  end
+  
+  # Saves the changes in a Journal
+  # Called after_save
+  def create_journal
+    if @current_journal
+      # attributes changes
+      (Issue.column_names - %w(id description root_id lft rgt lock_version created_on updated_on)).each {|c|
+        @current_journal.details << JournalDetail.new(:property => 'attr',
+                                                      :prop_key => c,
+                                                      :old_value => @issue_before_change.send(c),
+                                                      :value => send(c)) unless send(c)==@issue_before_change.send(c)
+      }
+      # custom fields changes
+      custom_values.each {|c|
+        next if (@custom_values_before_change[c.custom_field_id]==c.value ||
+                  (@custom_values_before_change[c.custom_field_id].blank? && c.value.blank?))
+        @current_journal.details << JournalDetail.new(:property => 'cf', 
+                                                      :prop_key => c.custom_field_id,
+                                                      :old_value => @custom_values_before_change[c.custom_field_id],
+                                                      :value => c.value)
+      }      
+      @current_journal.save
+      # reset current journal
+      init_journal @current_journal.user, @current_journal.notes
+    end
+  end
+
+  # Query generator for selecting groups of issue counts for a project
+  # based on specific criteria
+  #
+  # Options
+  # * project - Project to search in.
+  # * field - String. Issue field to key off of in the grouping.
+  # * joins - String. The table name to join against.
+  def self.count_and_group_by(options)
+    project = options.delete(:project)
+    select_field = options.delete(:field)
+    joins = options.delete(:joins)
+
+    where = "i.#{select_field}=j.id"
+    
+    ActiveRecord::Base.connection.select_all("select    s.id as status_id, 
+                                                s.is_closed as closed, 
+                                                j.id as #{select_field},
+                                                count(i.id) as total 
+                                              from 
+                                                  #{Issue.table_name} i, #{IssueStatus.table_name} s, #{joins} as j
+                                              where 
+                                                i.status_id=s.id 
+                                                and #{where}
+                                                and i.project_id=#{project.id}
+                                              group by s.id, s.is_closed, j.id")
+  end
+  
+
+end