Make the query built by has_many ...., :dependent => :____ lazy since all the...

Make the query built by has_many ...., :dependent => :____ lazy since all the information is not really available yet.

activerecord/lib/active_record/associations.rb

@@ -1495,13 +1495,6 @@ def add_touch_callbacks(reflection, touch_attribute)
         # finder conditions.
         def configure_dependency_for_has_many(reflection)
           if reflection.options.include?(:dependent)
-            # Add polymorphic type if the :as option is present
-            dependent_conditions = []
-            dependent_conditions << "#{reflection.primary_key_name} = \#{record.#{reflection.name}.send(:owner_quoted_id)}"
-            dependent_conditions << "#{reflection.options[:as]}_type = '#{base_class.name}'" if reflection.options[:as]
-            dependent_conditions << sanitize_sql(reflection.options[:conditions], reflection.table_name) if reflection.options[:conditions]
-            dependent_conditions = dependent_conditions.collect {|where| "(#{where})" }.join(" AND ")
-            dependent_conditions = dependent_conditions.gsub('@', '\@')
             case reflection.options[:dependent]
               when :destroy
                 method_name = "has_many_dependent_destroy_for_#{reflection.name}".to_sym
@@ -1510,51 +1503,30 @@ def configure_dependency_for_has_many(reflection)
                 end
                 before_destroy method_name
               when :delete_all
-                # before_destroy do |record|
-                #   self.class.send(:delete_all_has_many_dependencies,
-                #     record,
-                #     "posts",
-                #     Post,
-                #     %@...@) # this is a string literal like %(...)
-                #   end
-                # end
-                module_eval <<-CALLBACK
-                  before_destroy do |record|
-                    self.class.send(:delete_all_has_many_dependencies,
-                      record,
-                      "#{reflection.name}",
-                      #{reflection.class_name},
-                      %@#{dependent_conditions}@)
-                  end
-                CALLBACK
+                before_destroy do |record|
+                  self.class.send(:delete_all_has_many_dependencies,
+                  record,
+                  reflection.name,
+                  reflection.klass,
+                  reflection.dependent_conditions(record, self.class))
+                end
               when :nullify
-                # before_destroy do |record|
-                #   self.class.send(:nullify_has_many_dependencies,
-                #     record,
-                #     "posts",
-                #     Post,
-                #     "user_id",
-                #     %@...@) # this is a string literal like %(...)
-                #   end
-                # end
-                module_eval <<-CALLBACK
-                  before_destroy do |record|
-                    self.class.send(:nullify_has_many_dependencies,
-                      record,
-                      "#{reflection.name}",
-                      #{reflection.class_name},
-                      "#{reflection.primary_key_name}",
-                      %@#{dependent_conditions}@)
-                  end
-                CALLBACK
-                when :restrict
-                  method_name = "has_many_dependent_restrict_for_#{reflection.name}".to_sym
-                  define_method(method_name) do
-                    unless send(reflection.name).empty?
-                      raise DeleteRestrictionError.new(reflection)
-                    end
+                before_destroy do |record|
+                  self.class.send(:nullify_has_many_dependencies,
+                  record,
+                  reflection.name,
+                  reflection.klass,
+                  reflection.primary_key_name,
+                  reflection.dependent_conditions(record, self.class))
+                end
+              when :restrict
+                method_name = "has_many_dependent_restrict_for_#{reflection.name}".to_sym
+                define_method(method_name) do
+                  unless send(reflection.name).empty?
+                    raise DeleteRestrictionError.new(reflection)
                   end
-                  before_destroy method_name
+                end
+                before_destroy method_name
               else
                 raise ArgumentError, "The :dependent option expects either :destroy, :delete_all, :nullify or :restrict (#{reflection.options[:dependent].inspect})"
             end

activerecord/lib/active_record/reflection.rb

@@ -277,6 +277,16 @@ def validate?
         !options[:validate].nil? ? options[:validate] : (options[:autosave] == true || macro == :has_many)
       end
 
+      def dependent_conditions(record, base_class)
+        dependent_conditions = []
+        dependent_conditions << "#{primary_key_name} = #{record.send(name).send(:owner_quoted_id)}"
+        dependent_conditions << "#{options[:as]}_type = '#{base_class.name}'" if options[:as]
+        dependent_conditions << klass.send(:sanitize_sql, options[:conditions]) if options[:conditions]
+        dependent_conditions = dependent_conditions.collect {|where| "(#{where})" }.join(" AND ")
+        dependent_conditions = dependent_conditions.gsub('@', '\@')
+        dependent_conditions
+      end
+
       private
         def derive_class_name
           class_name = name.to_s.camelize