module ActiveRecord module Associations class AssociationProxy #:nodoc: attr_reader :reflection alias_method :proxy_respond_to?, :respond_to? alias_method :proxy_extend, :extend delegate :to_param, :to => :proxy_target instance_methods.each { |m| undef_method m unless m =~ /(^__|^nil\?$|^send$|proxy_)/ } def initialize(owner, reflection) @owner, @reflection = owner, reflection Array(reflection.options[:extend]).each { |ext| proxy_extend(ext) } reset end def proxy_owner @owner end def proxy_reflection @reflection end def proxy_target @target end def respond_to?(symbol, include_priv = false) proxy_respond_to?(symbol, include_priv) || (load_target && @target.respond_to?(symbol, include_priv)) end # Explicitly proxy === because the instance method removal above # doesn't catch it. def ===(other) load_target other === @target end def aliased_table_name @reflection.klass.table_name end def conditions @conditions ||= interpolate_sql(sanitize_sql(@reflection.options[:conditions])) if @reflection.options[:conditions] end alias :sql_conditions :conditions def reset @loaded = false @target = nil end def reload reset load_target end def loaded? @loaded end def loaded @loaded = true end def target @target end def target=(target) @target = target loaded end def inspect reload unless loaded? @target.inspect end protected def dependent? @reflection.options[:dependent] end def quoted_record_ids(records) records.map { |record| record.quoted_id }.join(',') end def interpolate_sql_options!(options, *keys) keys.each { |key| options[key] &&= interpolate_sql(options[key]) } end def interpolate_sql(sql, record = nil) @owner.send(:interpolate_sql, sql, record) end def sanitize_sql(sql) @reflection.klass.send(:sanitize_sql, sql) end def set_belongs_to_association_for(record) if @reflection.options[:as] record["#{@reflection.options[:as]}_id"] = @owner.id unless @owner.new_record? record["#{@reflection.options[:as]}_type"] = @owner.class.base_class.name.to_s else record[@reflection.primary_key_name] = @owner.id unless @owner.new_record? end end def merge_options_from_reflection!(options) options.reverse_merge!( :group => @reflection.options[:group], :limit => @reflection.options[:limit], :offset => @reflection.options[:offset], :joins => @reflection.options[:joins], :include => @reflection.options[:include], :select => @reflection.options[:select] ) end private def method_missing(method, *args, &block) if load_target @target.send(method, *args, &block) end end def load_target return nil unless defined?(@loaded) if !loaded? and (!@owner.new_record? || foreign_key_present) @target = find_target end @loaded = true @target rescue ActiveRecord::RecordNotFound reset end # Can be overwritten by associations that might have the foreign key available for an association without # having the object itself (and still being a new record). Currently, only belongs_to presents this scenario. def foreign_key_present false end def raise_on_type_mismatch(record) unless record.is_a?(@reflection.klass) raise ActiveRecord::AssociationTypeMismatch, "#{@reflection.klass} expected, got #{record.class}" end end # Array#flatten has problems with recursive arrays. Going one level deeper solves the majority of the problems. def flatten_deeper(array) array.collect { |element| element.respond_to?(:flatten) ? element.flatten : element }.flatten end end end end