openproject/app/models/work_package.rb

#-- encoding: UTF-8
#-- copyright
# OpenProject is a project management system.
# Copyright (C) 2012-2013 the OpenProject Foundation (OPF)
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License version 3.
#
# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
# Copyright (C) 2006-2013 Jean-Philippe Lang
# Copyright (C) 2010-2013 the ChiliProject Team
#
# 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.
#
# See doc/COPYRIGHT.rdoc for more details.
#++

# While loading the Issue class below, we lazy load the Project class. Which itself need WorkPackage.
# So we create an 'emtpy' Issue class first, to make Project happy.

class WorkPackage < ActiveRecord::Base

  include WorkPackage::Validations
  include WorkPackage::SchedulingRules
  include WorkPackage::StatusTransitions
  include WorkPackage::AskBeforeDestruction
  include WorkPackage::TimeEntries

  include OpenProject::Journal::AttachmentHelper

  # >>> issues.rb >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
  include Redmine::SafeAttributes

  DONE_RATIO_OPTIONS = %w(field status disabled)
  ATTRIBS_WITH_VALUES_FROM_CHILDREN = %w(priority_id start_date due_date estimated_hours done_ratio)
  # <<< issues.rb <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

  belongs_to :project
  belongs_to :type
  belongs_to :status, :class_name => 'Status', :foreign_key => 'status_id'
  belongs_to :author, :class_name => 'User', :foreign_key => 'author_id'
  belongs_to :assigned_to, :class_name => 'Principal', :foreign_key => 'assigned_to_id'
  belongs_to :responsible, :class_name => "User", :foreign_key => "responsible_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 => 'Category', :foreign_key => 'category_id'

  has_many :time_entries, :dependent => :delete_all
  has_many :relations_from, :class_name => 'Relation', :foreign_key => 'from_id', :dependent => :delete_all
  has_many :relations_to, :class_name => 'Relation', :foreign_key => 'to_id', :dependent => :delete_all
  has_and_belongs_to_many :changesets,
                          :order => "#{Changeset.table_name}.committed_on ASC, #{Changeset.table_name}.id ASC"

  # >>> issues.rb >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
  attr_protected :project_id, :author_id, :lft, :rgt
  # <<< issues.rb <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

  scope :recently_updated, :order => "#{WorkPackage.table_name}.updated_at DESC"
  scope :visible, lambda {|*args| { :include => :project,
                                    :conditions => WorkPackage.visible_condition(args.first ||
                                                                                 User.current) } }
  scope :without_deleted, :conditions => "#{WorkPackage.quoted_table_name}.deleted_at IS NULL"
  scope :deleted, :conditions => "#{WorkPackage.quoted_table_name}.deleted_at IS NOT NULL"

  scope :in_status, lambda {|*args| where(:status_id => (args.first.respond_to?(:id) ? args.first.id : args.first))}

  scope :for_projects, lambda { |projects|
    {:conditions => {:project_id => projects}}
  }

  # >>> issues.rb >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
  scope :open, :conditions => ["#{Status.table_name}.is_closed = ?", false], :include => :status

  scope :with_limit, lambda { |limit| { :limit => limit} }

  scope :on_active_project, lambda { {
    :include => [:status, :project, :type],
    :conditions => "#{Project.table_name}.status=#{Project::STATUS_ACTIVE}" }}

  scope :without_version, lambda {
    {
      :conditions => { :fixed_version_id => nil}
    }
  }

  scope :with_query, lambda {|query|
    {
      :conditions => ::Query.merge_conditions(query.statement)
    }
  }
  # <<< issues.rb <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

  after_initialize :set_default_values

  acts_as_watchable

  before_save :store_former_parent_id

  include OpenProject::NestedSet::WithRootIdScope

  after_save :reschedule_following_issues,
             :update_parent_attributes

  after_move :remove_invalid_relations,
             :recalculate_attributes_for_former_parent

  after_destroy :update_parent_attributes

  # >>> issues.rb >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
  before_create :default_assign
  before_save :close_duplicates, :update_done_ratio_from_status
  before_destroy :remove_attachments
  # <<< issues.rb <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

  acts_as_customizable

  acts_as_searchable :columns => ['subject', "#{table_name}.description", "#{Journal.table_name}.notes"],
                     :include => [:project, :journals],
                     :date_column => "#{quoted_table_name}.created_at",
                     # sort by id so that limited eager loading doesn't break with postgresql
                     :order_column => "#{table_name}.id"

  ##################### WARNING #####################
  # Do not change the order of acts_as_attachable   #
  # and acts_as_journalized!                        #
  #                                                 #
  # This order ensures that no journal entries are  #
  # written after a project is destroyed.           #
  #                                                 #
  # See test/unit/project_test.rb                   #
  # test_destroying_root_projects_should_clear_data #
  # for details.                                    #
  ###################################################
  acts_as_attachable :after_add => :attachments_changed,
                     :after_remove => :attachments_changed

  after_validation :set_attachments_error_details, if: lambda {|work_package| work_package.errors.messages.has_key? :attachments}

  associated_to_ask_before_destruction TimeEntry,
                                       ->(work_packages) { TimeEntry.on_work_packages(work_packages).count > 0 },
                                       self.method(:cleanup_time_entries_before_destruction_of)

  # Mapping attributes, that are passed in as id's onto their respective associations
  # (eg. type=4711 onto type=Type.find(4711))
  include AssociationsMapper
  # recovered this from planning-element: is it still needed?!
  map_associations_for :parent,
                       :status,
                       :type,
                       :project,
                       :priority

  # This one is here only to ease reading
  module JournalizedProcs
    def self.event_title
      Proc.new do |data|
        journal = data.journal
        work_package = journal.journable

        title = work_package.to_s
        title << " (#{work_package.status.name})" if work_package.status.present?

        title
      end
    end

    def self.event_type
      Proc.new do |data|
        journal = data.journal
        t = 'work_package'

        t << if journal.changed_data.empty? && !journal.initial?
               '-note'
             else
               status = Status.find_by_id(data.status_id)

               status.try(:is_closed?) ? '-closed' : '-edit'
             end

        t
      end
    end
  end

  acts_as_journalized :event_title => JournalizedProcs.event_title,
                      :event_type => JournalizedProcs.event_type,
                      :except => ["root_id"],
                      :activity_find_options => { :include => [:status, :type] }

  register_on_journal_formatter(:id, 'parent_id')
  register_on_journal_formatter(:fraction, 'estimated_hours')
  register_on_journal_formatter(:decimal, 'done_ratio')
  register_on_journal_formatter(:diff, 'description')
  register_on_journal_formatter(:attachment, /attachments_?\d+/)
  register_on_journal_formatter(:custom_field, /custom_fields_\d+/)

  # Joined
  register_on_journal_formatter :named_association, :parent_id, :project_id,
                                                    :status_id, :type_id,
                                                    :assigned_to_id, :priority_id,
                                                    :category_id, :fixed_version_id,
                                                    :planning_element_status_id,
                                                    :author_id, :responsible_id
  register_on_journal_formatter :datetime,          :start_date, :due_date, :deleted_at

  # By planning element
  register_on_journal_formatter :plaintext,         :subject,
                                                    :planning_element_status_comment,
                                                    :responsible_id

  # acts_as_journalized will create an initial journal on wp creation
  # and touch the journaled object:
  # journal.rb:47
  #
  # This will result in optimistic locking increasing the lock_version attribute to 1.
  # In order to avoid stale object errors we reload the attributes in question
  # after the wp is created.
  # As after_create is run before after_save, and journal creation is triggered by an
  # after_save hook, we rely on after_save and a specific version here.
  after_save :reload_lock_and_timestamps, :if => Proc.new { |wp| wp.lock_version == 0 }

  # Returns a SQL conditions string used to find all work units visible by the specified user
  def self.visible_condition(user, options={})
    Project.allowed_to_condition(user, :view_work_packages, options)
  end

  def self.done_ratio_disabled?
    Setting.work_package_done_ratio == 'disabled'
  end

  def self.use_status_for_done_ratio?
    Setting.work_package_done_ratio == 'status'
  end

  def self.use_field_for_done_ratio?
    Setting.work_package_done_ratio == 'field'
  end

  # Returns true if usr or current user is allowed to view the work_package
  def visible?(usr=nil)
    (usr || User.current).allowed_to?(:view_work_packages, self.project)
  end

  def copy_from(arg, options = {})
    merged_options = { :exclude => ["id",
                                    "root_id",
                                    "parent_id",
                                    "lft",
                                    "rgt",
                                    "type", # type_id is in options, type is for STI.
                                    "created_at",
                                    "updated_at"] + (options[:exclude]|| []).map(&:to_s) }

    work_package = arg.is_a?(WorkPackage) ? arg : WorkPackage.visible.find(arg)

    # attributes don't come from form, so it's save to force assign
    self.force_attributes = work_package.attributes.dup.except(*merged_options[:exclude])
    self.parent_id = work_package.parent_id if work_package.parent_id
    self.custom_field_values = work_package.custom_field_values.inject({}) {|h,v| h[v.custom_field_id] = v.value; h}
    self.status = work_package.status

    work_package.watchers.each do |watcher|
      # This might be a problem once this method is used on existing work packages
      # then, the watchers are added, keeping preexisting watchers
      self.add_watcher(watcher.user)
    end

    self
  end

  # Returns true if the work_package is overdue
  def overdue?
    !due_date.nil? && (due_date < Date.today) && !status.is_closed?
  end

  # ACTS AS JOURNALIZED
  def activity_type
    "work_packages"
  end

  # RELATIONS
  def delete_relations(work_package)
    unless Setting.cross_project_work_package_relations?
      work_package.relations_from.clear
      work_package.relations_to.clear
    end
  end

  def delete_invalid_relations(invalid_work_packages)
    invalid_work_package.each do |work_package|
      work_package.relations.each do |relation|
        relation.destroy unless relation.valid?
      end
    end
  end

  # Returns true if this work package is blocked by another work package that is still open
  def blocked?
    !relations_to.detect {|ir| ir.relation_type == 'blocks' && !ir.from.closed?}.nil?
  end

  def relations
    Relation.of_work_package(self)
  end

  def relation(id)
    Relation.of_work_package(self).find(id)
  end

  def new_relation
    self.relations_from.build
  end

  def add_time_entry(attributes={})
    attributes.reverse_merge!({
        :project => project,
        :work_package => self
      })
    time_entries.build(attributes)
  end

  def all_dependent_packages(except=[])
    except << self
    dependencies = []
    relations_from.each do |relation|
      if relation.to && !except.include?(relation.to)
        dependencies << relation.to
        dependencies += relation.to.all_dependent_packages(except)
      end
    end
    dependencies
  end

  # Returns an array of issues that duplicate this one
  def duplicates
    relations_to.select {|r| r.relation_type == Relation::TYPE_DUPLICATES}.collect {|r| r.from}
  end

  def soonest_start
    @soonest_start ||= (
        relations_to.collect{|relation| relation.successor_soonest_start} +
        ancestors.collect(&:soonest_start)
      ).compact.max
  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_dates_of_target
      end
    end
  end

  def deleted?
    !!read_attribute(:deleted_at)
  end

  # Users the work_package can be assigned to
  delegate :assignable_users, :to => :project

  # Versions that the work_package can be assigned to
  # A work_package can be assigned to:
  #   * any open, shared version of the project the wp belongs to
  #   * the version it was already assigned to (to make sure, that you can still update closed tickets)
  def assignable_versions
    @assignable_versions ||= (project.shared_versions.open + [Version.find_by_id(fixed_version_id_was)]).compact.uniq.sort
  end

  def kind
    return type
  end

  def to_s
    "#{(kind.is_standard) ? l(:default_type) : "#{kind.name}"} ##{id}: #{subject}"
  end

  # Return true if the work_package is closed, otherwise false
  def closed?
    self.status.nil? || self.status.is_closed?
  end

  # Returns true if the work_package is overdue
  def overdue?
    !due_date.nil? && (due_date < Date.today) && !closed?
  end

  # TODO: move into Business Object and rename to update
  # update for now is a private method defined by AR
  def update_by!(user, attributes)
    raw_attachments = attributes.delete(:attachments)

    update_by(user, attributes)

    attach_files(raw_attachments)

    save
  end

  def update_by(user, attributes)
    add_journal(user, attributes.delete(:notes)) if attributes[:notes]

    add_time_entry_for(user, attributes.delete(:time_entry))
    attributes.delete(:attachments)

    self.attributes = attributes
  end

  def is_milestone?
    type && type.is_milestone?
  end

  # Returns an array of status that user is able to apply
  def new_statuses_allowed_to(user, include_default=false)
    return [] if status.nil?

    statuses = status.find_new_statuses_allowed_to(
      user.roles_for_project(project),
      type,
      author == user,
      assigned_to_id_changed? ? assigned_to_id_was == user.id : assigned_to_id == user.id
      )
    statuses << status unless statuses.empty?
    statuses << Status.default if include_default
    statuses = statuses.uniq.sort
    blocked? ? statuses.reject {|s| s.is_closed?} : statuses
  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.joins(:time_entries)
                                         .sum("#{TimeEntry.table_name}.hours").to_f || 0.0
  end

  # Moves/copies an work_package to a new project and type
  # Returns the moved/copied work_package on success, false on failure
  def move_to_project(*args)
    WorkPackage.transaction do
      move_to_project_without_transaction(*args) || raise(ActiveRecord::Rollback)
    end || false
  end

  # >>> issues.rb >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
  # 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 or don't want to be notified
    notified << author if author && author.active? && author.notify_about?(self)
    if assigned_to
      if assigned_to.is_a?(Group)
        notified += assigned_to.users.select {|u| u.active? && u.notify_about?(self)}
      else
        notified << assigned_to if assigned_to.active? && assigned_to.notify_about?(self)
      end
    end
    notified.uniq!
    # Remove users that can not view the issue
    notified.reject! {|user| !visible?(user)}
    notified.collect(&:mail)
  end

  def done_ratio
    if WorkPackage.use_status_for_done_ratio? && status && status.default_done_ratio
      status.default_done_ratio
    else
      read_attribute(:done_ratio)
    end
  end

  def estimated_hours=(h)
    converted_hours = (h.is_a?(String) ? h.to_hours : h)
    write_attribute :estimated_hours, !!converted_hours ? converted_hours : h
  end
  # <<< issues.rb <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

  # Safely sets attributes
  # Should be called from controllers instead of #attributes=
  # attr_accessible is too rough because we still want things like
  # WorkPackage.new(:project => foo) to work
  # TODO: move workflow/permission checks from controllers to here
  def safe_attributes=(attrs, user=User.current)
    return unless attrs.is_a?(Hash)

    # User can change issue attributes only if he has :edit permission or if a workflow transition is allowed
    attrs = delete_unsafe_attributes(attrs, user)
    return if attrs.empty?

    # Type must be set before since new_statuses_allowed_to depends on it.
    if t = attrs.delete('type_id')
      self.type_id = t
    end

    if attrs['status_id']
      unless new_statuses_allowed_to(user).collect(&:id).include?(attrs['status_id'].to_i)
        attrs.delete('status_id')
      end
    end

    if parent.present?
      attrs.reject! {|k,v| %w(priority_id done_ratio start_date due_date estimated_hours).include?(k)}
    end

    if attrs.has_key?('parent_id')
      if !user.allowed_to?(:manage_subtasks, project)
        attrs.delete('parent_id')
      elsif !attrs['parent_id'].blank?
        attrs.delete('parent_id') unless WorkPackage.visible(user).exists?(attrs['parent_id'].to_i)
      end
    end

    self.attributes = attrs
  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)
    WorkPackage.transaction do
      if params[:time_entry] && (params[:time_entry][:hours].present? || params[:time_entry][:comments].present?) && User.current.allowed_to?(:log_time, project)
        @time_entry = existing_time_entry || TimeEntry.new
        @time_entry.project = project
        @time_entry.work_package = 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])

        # 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)
          error_message = l(:notice_locking_conflict)

          journals_since = self.journals.after(lock_version)

          if journals_since.any?
            changes = journals_since.map { |j| "#{j.user.name} (#{j.created_at.to_s(:short)})" }
            error_message << " " << l(:notice_locking_conflict_additional_information, :users => changes.join(', '))
          end

          error_message << " " << l(:notice_locking_conflict_reload_page)

          errors.add :base, error_message
          raise ActiveRecord::Rollback
        end
      end
    end
  end

  # >>> issues.rb >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
  # Overrides Redmine::Acts::Customizable::InstanceMethods#available_custom_fields
  def available_custom_fields
    (project && type) ? (project.all_work_package_custom_fields & type.custom_fields.all) : []
  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 type_id=(tid)
    self.type = nil
    result = write_attribute(:type_id, tid)
    @custom_field_values = nil
    result
  end

  # Overrides attributes= so that type_id gets assigned first
  def attributes_with_type_first=(new_attributes)
    return if new_attributes.nil?
    new_type_id = new_attributes['type_id'] || new_attributes[:type_id]
    if new_type_id
      self.type_id = new_type_id
    end
    send :attributes_without_type_first=, new_attributes
  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_status
    if WorkPackage.use_status_for_done_ratio? && status && status.default_done_ratio
      self.done_ratio = status.default_done_ratio
    end
  end

  # Is the amount of work done less than it should for the due date
  def behind_schedule?
    return false if start_date.nil? || due_date.nil?
    done_date = start_date + ((due_date - start_date+1)* done_ratio/100).floor
    return done_date <= Date.today
  end

  def move_to_project_without_transaction(new_project, new_type = nil, options = {})
    options ||= {}
    work_package = options[:copy] ? self.class.new.copy_from(self) : self

    if new_project && work_package.project_id != new_project.id
      delete_relations(work_package)
      # work_package is moved to another project
      # reassign to the category with same name if any
      new_category = work_package.category.nil? ? nil : new_project.categories.find_by_name(work_package.category.name)
      work_package.category = new_category
      # Keep the fixed_version if it's still valid in the new_project
      unless new_project.shared_versions.include?(work_package.fixed_version)
        work_package.fixed_version = nil
      end
      work_package.project = new_project

      if !Setting.cross_project_work_package_relations? &&
         parent && parent.project_id != project_id
        self.parent_id = nil
      end
    end
    if new_type
      work_package.type = new_type
      work_package.reset_custom_values!
    end
    # Allow bulk setting of attributes on the work_package
    if options[:attributes]
      # before setting the attributes, we need to remove the move-related fields
      work_package.attributes = options[:attributes].except(:copy,:new_project_id, :new_type_id, :follow, :ids)
                                                    .reject { |key, value| value.blank? }
    end                                             # FIXME this eliminates the case, where values shall be bulk-assigned to null, but this needs to work together with the permit
    if options[:copy]
      work_package.author = User.current
      work_package.custom_field_values = self.custom_field_values.inject({}) {|h,v| h[v.custom_field_id] = v.value; h}
      work_package.status = if options[:attributes] && options[:attributes][:status_id]
                              Status.find_by_id(options[:attributes][:status_id])
                            else
                              self.status
                            end
    end

    if work_package.save
      unless options[:copy]
        # Manually update project_id on related time entries
        TimeEntry.update_all("project_id = #{new_project.id}", {:work_package_id => id})

        work_package.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
    work_package
  end

  # Override of acts_as_watchable#possible_watcher_users
  # Restricts the result to project members if the project is private
  def possible_watcher_users
    users = project.is_public? ? User.not_builtin : project.users
    users.select {|user| possible_watcher?(user)}
  end

  protected

  def recalculate_attributes_for(work_package_id)
    p = if work_package_id.is_a? WorkPackage
          work_package_id
        else
          WorkPackage.find_by_id(work_package_id)
        end

    return unless p

    p.inherit_priority_from_children

    p.inherit_dates_from_children

    p.inherit_done_ratio_from_leaves

    p.inherit_estimated_hours_from_leaves

    # ancestors will be recursively updated
    if p.changed?
      p.journal_notes = I18n.t('work_package.updated_automatically_by_child_changes', :child => "##{id}")

      # Ancestors will be updated by parent's after_save hook.
      p.save(:validate => false)
    end
  end

  def update_parent_attributes
    recalculate_attributes_for(parent_id) if parent_id.present?
  end

  def inherit_priority_from_children
    # priority = highest priority of children
    if priority_position = children.joins(:priority).maximum("#{IssuePriority.table_name}.position")
      self.priority = IssuePriority.find_by_position(priority_position)
    end
  end

  def inherit_dates_from_children
    active_children = children.without_deleted

    unless active_children.empty?
      self.start_date = [active_children.minimum(:start_date), active_children.minimum(:due_date)].compact.min
      self.due_date   = [active_children.maximum(:start_date), active_children.maximum(:due_date)].compact.max
    end
  end

  def inherit_done_ratio_from_leaves
    return if WorkPackage.done_ratio_disabled?

    # done ratio = weighted average ratio of leaves
    unless WorkPackage.use_status_for_done_ratio? && status && status.default_done_ratio
      leaves_count = leaves.count
      if leaves_count > 0
        average = leaves.average(:estimated_hours).to_f
        if average == 0
          average = 1
        end
        done = leaves.joins(:status).sum("COALESCE(estimated_hours, #{average}) * (CASE WHEN is_closed = #{connection.quoted_true} THEN 100 ELSE COALESCE(done_ratio, 0) END)").to_f
        progress = done / (average * leaves_count)

        self.done_ratio = progress.round
      end
    end
  end

  def inherit_estimated_hours_from_leaves
    # estimate = sum of leaves estimates
    self.estimated_hours = leaves.sum(:estimated_hours).to_f
    self.estimated_hours = nil if estimated_hours == 0.0
  end

  def store_former_parent_id
    @former_parent_id = parent_id_changed? ? parent_id_was : false
    true # force callback to return true
  end

  def remove_invalid_relations
    # delete invalid relations of all descendants
    self_and_descendants.each do |issue|
      issue.relations.each do |relation|
        relation.destroy unless relation.valid?
      end
    end
  end

  def recalculate_attributes_for_former_parent
    recalculate_attributes_for(@former_parent_id) if @former_parent_id
  end

  def reload_lock_and_timestamps
    reload(:select => [:lock_version, :created_at, :updated_at])
  end

  # 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_work_packages)
        projects = Project.visible.all
      else
        User.current.memberships.each {|m| projects << m.project if m.roles.detect {|r| r.allowed_to?(:move_work_packages)}}
      end
    end
    projects
  end

  # Do not redefine alias chain on reload (see #4838)
  alias_method_chain(:attributes=, :type_first) unless method_defined?(:attributes_without_type_first=)

  safe_attributes 'type_id',
    'status_id',
    'parent_id',
    'category_id',
    'assigned_to_id',
    'priority_id',
    'fixed_version_id',
    'subject',
    'description',
    'start_date',
    'due_date',
    'done_ratio',
    'estimated_hours',
    'custom_field_values',
    'custom_fields',
    'lock_version',
    :if => lambda {|issue, user| issue.new_record? || user.allowed_to?(:edit_work_packages, issue.project) }

  safe_attributes 'status_id',
    'assigned_to_id',
    'fixed_version_id',
    'done_ratio',
    :if => lambda {|issue, user| issue.new_statuses_allowed_to(user).any? }

  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

  # 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(["#{WorkPackage.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
    WorkPackage.update_versions(["#{Version.table_name}.project_id IN (?) OR #{WorkPackage.table_name}.project_id IN (?)", moved_project_ids, moved_project_ids])
  end

  # Extracted from the ReportsController.
  def self.by_type(project)
    count_and_group_by(:project => project,
                       :field => 'type_id',
                       :joins => Type.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 => Category.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
                                                #{WorkPackage.table_name} i, #{Status.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
  # <<< issues.rb <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

  private

  def set_default_values
    if new_record? # set default values for new records only
      self.status   ||= Status.default
      self.priority ||= IssuePriority.default
    end
  end

  def add_time_entry_for(user, attributes)
    return if attributes.nil? || attributes.values.all?(&:blank?)

    attributes.reverse_merge!({ :user => user,
                                :spent_on => Date.today })

    time_entries.build(attributes)
  end

  # >>> issues.rb >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
  # this removes all attachments separately before destroying the issue
  # avoids getting a ActiveRecord::StaleObjectError when deleting an issue
  def remove_attachments
    # immediately saves to the db
    attachments.clear
    reload # important
  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
    WorkPackage.all(:conditions => merge_conditions("#{WorkPackage.table_name}.fixed_version_id IS NOT NULL" +
                                                " AND #{WorkPackage.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.fixed_version = nil
        issue.save
      end
    end
  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

  # 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?
        # Implicitely creates a new journal
        duplicate.update_attribute :status, self.status
        # Same user and notes
        duplicate.journals.last.user = current_journal.user
        duplicate.journals.last.notes = current_journal.notes
      end
    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
                                                  #{WorkPackage.table_name} i, #{Status.table_name} s, #{joins} 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
  # <<< issues.rb <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

  def set_attachments_error_details
    if invalid_attachment = self.attachments.detect{|a| !a.valid?}
      errors.messages[:attachments].first << " - #{invalid_attachment.errors.full_messages.first}"
    end
  end
end