Chris@1464: # Redmine - project management software
Chris@1464: # Copyright (C) 2006-2013  Jean-Philippe Lang
Chris@1464: #
Chris@1464: # This program is free software; you can redistribute it and/or
Chris@1464: # modify it under the terms of the GNU General Public License
Chris@1464: # as published by the Free Software Foundation; either version 2
Chris@1464: # of the License, or (at your option) any later version.
Chris@1464: #
Chris@1464: # This program is distributed in the hope that it will be useful,
Chris@1464: # but WITHOUT ANY WARRANTY; without even the implied warranty of
Chris@1464: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
Chris@1464: # GNU General Public License for more details.
Chris@1464: #
Chris@1464: # You should have received a copy of the GNU General Public License
Chris@1464: # along with this program; if not, write to the Free Software
Chris@1464: # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
Chris@1464: 
Chris@1464: class CustomField < ActiveRecord::Base
Chris@1464:   include Redmine::SubclassFactory
Chris@1464: 
Chris@1464:   has_many :custom_values, :dependent => :delete_all
Chris@1464:   has_and_belongs_to_many :roles, :join_table => "#{table_name_prefix}custom_fields_roles#{table_name_suffix}", :foreign_key => "custom_field_id"
Chris@1464:   acts_as_list :scope => 'type = \'#{self.class}\''
Chris@1464:   serialize :possible_values
Chris@1464: 
Chris@1464:   validates_presence_of :name, :field_format
Chris@1464:   validates_uniqueness_of :name, :scope => :type
Chris@1464:   validates_length_of :name, :maximum => 30
Chris@1464:   validates_inclusion_of :field_format, :in => Proc.new { Redmine::CustomFieldFormat.available_formats }
Chris@1464:   validate :validate_custom_field
Chris@1464: 
Chris@1464:   before_validation :set_searchable
Chris@1464:   after_save :handle_multiplicity_change
Chris@1464:   after_save do |field|
Chris@1464:     if field.visible_changed? && field.visible
Chris@1464:       field.roles.clear
Chris@1464:     end
Chris@1464:   end
Chris@1464: 
Chris@1464:   scope :sorted, lambda { order("#{table_name}.position ASC") }
Chris@1464:   scope :visible, lambda {|*args|
Chris@1464:     user = args.shift || User.current
Chris@1464:     if user.admin?
Chris@1464:       # nop
Chris@1464:     elsif user.memberships.any?
Chris@1464:       where("#{table_name}.visible = ? OR #{table_name}.id IN (SELECT DISTINCT cfr.custom_field_id FROM #{Member.table_name} m" +
Chris@1464:         " INNER JOIN #{MemberRole.table_name} mr ON mr.member_id = m.id" +
Chris@1464:         " INNER JOIN #{table_name_prefix}custom_fields_roles#{table_name_suffix} cfr ON cfr.role_id = mr.role_id" +
Chris@1464:         " WHERE m.user_id = ?)",
Chris@1464:         true, user.id)
Chris@1464:     else
Chris@1464:       where(:visible => true)
Chris@1464:     end
Chris@1464:   }
Chris@1464: 
Chris@1464:   def visible_by?(project, user=User.current)
Chris@1464:     visible? || user.admin?
Chris@1464:   end
Chris@1464: 
Chris@1464:   def field_format=(arg)
Chris@1464:     # cannot change format of a saved custom field
Chris@1464:     super if new_record?
Chris@1464:   end
Chris@1464: 
Chris@1464:   def set_searchable
Chris@1464:     # make sure these fields are not searchable
Chris@1464:     self.searchable = false if %w(int float date bool).include?(field_format)
Chris@1464:     # make sure only these fields can have multiple values
Chris@1464:     self.multiple = false unless %w(list user version).include?(field_format)
Chris@1464:     true
Chris@1464:   end
Chris@1464: 
Chris@1464:   def validate_custom_field
Chris@1464:     if self.field_format == "list"
Chris@1464:       errors.add(:possible_values, :blank) if self.possible_values.nil? || self.possible_values.empty?
Chris@1464:       errors.add(:possible_values, :invalid) unless self.possible_values.is_a? Array
Chris@1464:     end
Chris@1464: 
Chris@1464:     if regexp.present?
Chris@1464:       begin
Chris@1464:         Regexp.new(regexp)
Chris@1464:       rescue
Chris@1464:         errors.add(:regexp, :invalid)
Chris@1464:       end
Chris@1464:     end
Chris@1464: 
Chris@1464:     if default_value.present? && !valid_field_value?(default_value)
Chris@1464:       errors.add(:default_value, :invalid)
Chris@1464:     end
Chris@1464:   end
Chris@1464: 
Chris@1464:   def possible_values_options(obj=nil)
Chris@1464:     case field_format
Chris@1464:     when 'user', 'version'
Chris@1464:       if obj.respond_to?(:project) && obj.project
Chris@1464:         case field_format
Chris@1464:         when 'user'
Chris@1464:           obj.project.users.sort.collect {|u| [u.to_s, u.id.to_s]}
Chris@1464:         when 'version'
Chris@1464:           obj.project.shared_versions.sort.collect {|u| [u.to_s, u.id.to_s]}
Chris@1464:         end
Chris@1464:       elsif obj.is_a?(Array)
Chris@1464:         obj.collect {|o| possible_values_options(o)}.reduce(:&)
Chris@1464:       else
Chris@1464:         []
Chris@1464:       end
Chris@1464:     when 'bool'
Chris@1464:       [[l(:general_text_Yes), '1'], [l(:general_text_No), '0']]
Chris@1464:     else
Chris@1464:       possible_values || []
Chris@1464:     end
Chris@1464:   end
Chris@1464: 
Chris@1464:   def possible_values(obj=nil)
Chris@1464:     case field_format
Chris@1464:     when 'user', 'version'
Chris@1464:       possible_values_options(obj).collect(&:last)
Chris@1464:     when 'bool'
Chris@1464:       ['1', '0']
Chris@1464:     else
Chris@1464:       values = super()
Chris@1464:       if values.is_a?(Array)
Chris@1464:         values.each do |value|
Chris@1464:           value.force_encoding('UTF-8') if value.respond_to?(:force_encoding)
Chris@1464:         end
Chris@1464:         values
Chris@1464:       else
Chris@1464:         []
Chris@1464:       end
Chris@1464:     end
Chris@1464:   end
Chris@1464: 
Chris@1464:   # Makes possible_values accept a multiline string
Chris@1464:   def possible_values=(arg)
Chris@1464:     if arg.is_a?(Array)
Chris@1464:       super(arg.compact.collect(&:strip).select {|v| !v.blank?})
Chris@1464:     else
Chris@1464:       self.possible_values = arg.to_s.split(/[\n\r]+/)
Chris@1464:     end
Chris@1464:   end
Chris@1464: 
Chris@1464:   def cast_value(value)
Chris@1464:     casted = nil
Chris@1464:     unless value.blank?
Chris@1464:       case field_format
Chris@1464:       when 'string', 'text', 'list'
Chris@1464:         casted = value
Chris@1464:       when 'date'
Chris@1464:         casted = begin; value.to_date; rescue; nil end
Chris@1464:       when 'bool'
Chris@1464:         casted = (value == '1' ? true : false)
Chris@1464:       when 'int'
Chris@1464:         casted = value.to_i
Chris@1464:       when 'float'
Chris@1464:         casted = value.to_f
Chris@1464:       when 'user', 'version'
Chris@1464:         casted = (value.blank? ? nil : field_format.classify.constantize.find_by_id(value.to_i))
Chris@1464:       end
Chris@1464:     end
Chris@1464:     casted
Chris@1464:   end
Chris@1464: 
Chris@1464:   def value_from_keyword(keyword, customized)
Chris@1464:     possible_values_options = possible_values_options(customized)
Chris@1464:     if possible_values_options.present?
Chris@1464:       keyword = keyword.to_s.downcase
Chris@1464:       if v = possible_values_options.detect {|text, id| text.downcase == keyword}
Chris@1464:         if v.is_a?(Array)
Chris@1464:           v.last
Chris@1464:         else
Chris@1464:           v
Chris@1464:         end
Chris@1464:       end
Chris@1464:     else
Chris@1464:       keyword
Chris@1464:     end
Chris@1464:   end
Chris@1464: 
Chris@1464:   # Returns a ORDER BY clause that can used to sort customized
Chris@1464:   # objects by their value of the custom field.
Chris@1464:   # Returns nil if the custom field can not be used for sorting.
Chris@1464:   def order_statement
Chris@1464:     return nil if multiple?
Chris@1464:     case field_format
Chris@1464:       when 'string', 'text', 'list', 'date', 'bool'
Chris@1464:         # COALESCE is here to make sure that blank and NULL values are sorted equally
Chris@1464:         "COALESCE(#{join_alias}.value, '')"
Chris@1464:       when 'int', 'float'
Chris@1464:         # Make the database cast values into numeric
Chris@1464:         # Postgresql will raise an error if a value can not be casted!
Chris@1464:         # CustomValue validations should ensure that it doesn't occur
Chris@1464:         "CAST(CASE #{join_alias}.value WHEN '' THEN '0' ELSE #{join_alias}.value END AS decimal(30,3))"
Chris@1464:       when 'user', 'version'
Chris@1464:         value_class.fields_for_order_statement(value_join_alias)
Chris@1464:       else
Chris@1464:         nil
Chris@1464:     end
Chris@1464:   end
Chris@1464: 
Chris@1464:   # Returns a GROUP BY clause that can used to group by custom value
Chris@1464:   # Returns nil if the custom field can not be used for grouping.
Chris@1464:   def group_statement
Chris@1464:     return nil if multiple?
Chris@1464:     case field_format
Chris@1464:       when 'list', 'date', 'bool', 'int'
Chris@1464:         order_statement
Chris@1464:       when 'user', 'version'
Chris@1464:         "COALESCE(#{join_alias}.value, '')"
Chris@1464:       else
Chris@1464:         nil
Chris@1464:     end
Chris@1464:   end
Chris@1464: 
Chris@1464:   def join_for_order_statement
Chris@1464:     case field_format
Chris@1464:       when 'user', 'version'
Chris@1464:         "LEFT OUTER JOIN #{CustomValue.table_name} #{join_alias}" +
Chris@1464:           " ON #{join_alias}.customized_type = '#{self.class.customized_class.base_class.name}'" +
Chris@1464:           " AND #{join_alias}.customized_id = #{self.class.customized_class.table_name}.id" +
Chris@1464:           " AND #{join_alias}.custom_field_id = #{id}" +
Chris@1464:           " AND (#{visibility_by_project_condition})" +
Chris@1464:           " AND #{join_alias}.value <> ''" +
Chris@1464:           " AND #{join_alias}.id = (SELECT max(#{join_alias}_2.id) FROM #{CustomValue.table_name} #{join_alias}_2" +
Chris@1464:             " WHERE #{join_alias}_2.customized_type = #{join_alias}.customized_type" +
Chris@1464:             " AND #{join_alias}_2.customized_id = #{join_alias}.customized_id" +
Chris@1464:             " AND #{join_alias}_2.custom_field_id = #{join_alias}.custom_field_id)" +
Chris@1464:           " LEFT OUTER JOIN #{value_class.table_name} #{value_join_alias}" +
Chris@1464:           " ON CAST(CASE #{join_alias}.value WHEN '' THEN '0' ELSE #{join_alias}.value END AS decimal(30,0)) = #{value_join_alias}.id"
Chris@1464:       when 'int', 'float'
Chris@1464:         "LEFT OUTER JOIN #{CustomValue.table_name} #{join_alias}" +
Chris@1464:           " ON #{join_alias}.customized_type = '#{self.class.customized_class.base_class.name}'" +
Chris@1464:           " AND #{join_alias}.customized_id = #{self.class.customized_class.table_name}.id" +
Chris@1464:           " AND #{join_alias}.custom_field_id = #{id}" +
Chris@1464:           " AND (#{visibility_by_project_condition})" +
Chris@1464:           " AND #{join_alias}.value <> ''" +
Chris@1464:           " AND #{join_alias}.id = (SELECT max(#{join_alias}_2.id) FROM #{CustomValue.table_name} #{join_alias}_2" +
Chris@1464:             " WHERE #{join_alias}_2.customized_type = #{join_alias}.customized_type" +
Chris@1464:             " AND #{join_alias}_2.customized_id = #{join_alias}.customized_id" +
Chris@1464:             " AND #{join_alias}_2.custom_field_id = #{join_alias}.custom_field_id)"
Chris@1464:       when 'string', 'text', 'list', 'date', 'bool'
Chris@1464:         "LEFT OUTER JOIN #{CustomValue.table_name} #{join_alias}" +
Chris@1464:           " ON #{join_alias}.customized_type = '#{self.class.customized_class.base_class.name}'" +
Chris@1464:           " AND #{join_alias}.customized_id = #{self.class.customized_class.table_name}.id" +
Chris@1464:           " AND #{join_alias}.custom_field_id = #{id}" +
Chris@1464:           " AND (#{visibility_by_project_condition})" +
Chris@1464:           " AND #{join_alias}.id = (SELECT max(#{join_alias}_2.id) FROM #{CustomValue.table_name} #{join_alias}_2" +
Chris@1464:             " WHERE #{join_alias}_2.customized_type = #{join_alias}.customized_type" +
Chris@1464:             " AND #{join_alias}_2.customized_id = #{join_alias}.customized_id" +
Chris@1464:             " AND #{join_alias}_2.custom_field_id = #{join_alias}.custom_field_id)"
Chris@1464:       else
Chris@1464:         nil
Chris@1464:     end
Chris@1464:   end
Chris@1464: 
Chris@1464:   def join_alias
Chris@1464:     "cf_#{id}"
Chris@1464:   end
Chris@1464: 
Chris@1464:   def value_join_alias
Chris@1464:     join_alias + "_" + field_format
Chris@1464:   end
Chris@1464: 
Chris@1464:   def visibility_by_project_condition(project_key=nil, user=User.current)
Chris@1464:     if visible? || user.admin?
Chris@1464:       "1=1"
Chris@1464:     elsif user.anonymous?
Chris@1464:       "1=0"
Chris@1464:     else
Chris@1464:       project_key ||= "#{self.class.customized_class.table_name}.project_id"
Chris@1464:       "#{project_key} IN (SELECT DISTINCT m.project_id FROM #{Member.table_name} m" +
Chris@1464:         " INNER JOIN #{MemberRole.table_name} mr ON mr.member_id = m.id" +
Chris@1464:         " INNER JOIN #{table_name_prefix}custom_fields_roles#{table_name_suffix} cfr ON cfr.role_id = mr.role_id" +
Chris@1464:         " WHERE m.user_id = #{user.id} AND cfr.custom_field_id = #{id})"
Chris@1464:     end
Chris@1464:   end
Chris@1464: 
Chris@1464:   def self.visibility_condition
Chris@1464:     if user.admin?
Chris@1464:       "1=1"
Chris@1464:     elsif user.anonymous?
Chris@1464:       "#{table_name}.visible"
Chris@1464:     else
Chris@1464:       "#{project_key} IN (SELECT DISTINCT m.project_id FROM #{Member.table_name} m" +
Chris@1464:         " INNER JOIN #{MemberRole.table_name} mr ON mr.member_id = m.id" +
Chris@1464:         " INNER JOIN #{table_name_prefix}custom_fields_roles#{table_name_suffix} cfr ON cfr.role_id = mr.role_id" +
Chris@1464:         " WHERE m.user_id = #{user.id} AND cfr.custom_field_id = #{id})"
Chris@1464:     end
Chris@1464:   end
Chris@1464: 
Chris@1464:   def <=>(field)
Chris@1464:     position <=> field.position
Chris@1464:   end
Chris@1464: 
Chris@1464:   # Returns the class that values represent
Chris@1464:   def value_class
Chris@1464:     case field_format
Chris@1464:       when 'user', 'version'
Chris@1464:         field_format.classify.constantize
Chris@1464:       else
Chris@1464:         nil
Chris@1464:     end
Chris@1464:   end
Chris@1464: 
Chris@1464:   def self.customized_class
Chris@1464:     self.name =~ /^(.+)CustomField$/
Chris@1464:     $1.constantize rescue nil
Chris@1464:   end
Chris@1464: 
Chris@1464:   # to move in project_custom_field
Chris@1464:   def self.for_all
Chris@1464:     where(:is_for_all => true).order('position').all
Chris@1464:   end
Chris@1464: 
Chris@1464:   def type_name
Chris@1464:     nil
Chris@1464:   end
Chris@1464: 
Chris@1464:   # Returns the error messages for the given value
Chris@1464:   # or an empty array if value is a valid value for the custom field
Chris@1464:   def validate_field_value(value)
Chris@1464:     errs = []
Chris@1464:     if value.is_a?(Array)
Chris@1464:       if !multiple?
Chris@1464:         errs << ::I18n.t('activerecord.errors.messages.invalid')
Chris@1464:       end
Chris@1464:       if is_required? && value.detect(&:present?).nil?
Chris@1464:         errs << ::I18n.t('activerecord.errors.messages.blank')
Chris@1464:       end
Chris@1464:       value.each {|v| errs += validate_field_value_format(v)}
Chris@1464:     else
Chris@1464:       if is_required? && value.blank?
Chris@1464:         errs << ::I18n.t('activerecord.errors.messages.blank')
Chris@1464:       end
Chris@1464:       errs += validate_field_value_format(value)
Chris@1464:     end
Chris@1464:     errs
Chris@1464:   end
Chris@1464: 
Chris@1464:   # Returns true if value is a valid value for the custom field
Chris@1464:   def valid_field_value?(value)
Chris@1464:     validate_field_value(value).empty?
Chris@1464:   end
Chris@1464: 
Chris@1464:   def format_in?(*args)
Chris@1464:     args.include?(field_format)
Chris@1464:   end
Chris@1464: 
Chris@1464:   protected
Chris@1464: 
Chris@1464:   # Returns the error message for the given value regarding its format
Chris@1464:   def validate_field_value_format(value)
Chris@1464:     errs = []
Chris@1464:     if value.present?
Chris@1464:       errs << ::I18n.t('activerecord.errors.messages.invalid') unless regexp.blank? or value =~ Regexp.new(regexp)
Chris@1464:       errs << ::I18n.t('activerecord.errors.messages.too_short', :count => min_length) if min_length > 0 and value.length < min_length
Chris@1464:       errs << ::I18n.t('activerecord.errors.messages.too_long', :count => max_length) if max_length > 0 and value.length > max_length
Chris@1464: 
Chris@1464:       # Format specific validations
Chris@1464:       case field_format
Chris@1464:       when 'int'
Chris@1464:         errs << ::I18n.t('activerecord.errors.messages.not_a_number') unless value =~ /^[+-]?\d+$/
Chris@1464:       when 'float'
Chris@1464:         begin; Kernel.Float(value); rescue; errs << ::I18n.t('activerecord.errors.messages.invalid') end
Chris@1464:       when 'date'
Chris@1464:         errs << ::I18n.t('activerecord.errors.messages.not_a_date') unless value =~ /^\d{4}-\d{2}-\d{2}$/ && begin; value.to_date; rescue; false end
Chris@1464:       when 'list'
Chris@1464:         errs << ::I18n.t('activerecord.errors.messages.inclusion') unless possible_values.include?(value)
Chris@1464:       end
Chris@1464:     end
Chris@1464:     errs
Chris@1464:   end
Chris@1464: 
Chris@1464:   # Removes multiple values for the custom field after setting the multiple attribute to false
Chris@1464:   # We kepp the value with the highest id for each customized object
Chris@1464:   def handle_multiplicity_change
Chris@1464:     if !new_record? && multiple_was && !multiple
Chris@1464:       ids = custom_values.
Chris@1464:         where("EXISTS(SELECT 1 FROM #{CustomValue.table_name} cve WHERE cve.custom_field_id = #{CustomValue.table_name}.custom_field_id" +
Chris@1464:           " AND cve.customized_type = #{CustomValue.table_name}.customized_type AND cve.customized_id = #{CustomValue.table_name}.customized_id" +
Chris@1464:           " AND cve.id > #{CustomValue.table_name}.id)").
Chris@1464:         pluck(:id)
Chris@1464: 
Chris@1464:       if ids.any?
Chris@1464:         custom_values.where(:id => ids).delete_all
Chris@1464:       end
Chris@1464:     end
Chris@1464:   end
Chris@1464: end