From 4290267959e8c91b8f2a4898d3fa33b15b8b7d57 Mon Sep 17 00:00:00 2001
From: David Heinemeier Hansson <david@loudthinking.com>
Date: Wed, 29 Dec 2004 21:14:58 +0000
Subject: Moved support into Active Support

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@277 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
---
 activerecord/lib/active_record/acts/list.rb | 101 +++++++++++++++-------------
 1 file changed, 56 insertions(+), 45 deletions(-)

(limited to 'activerecord/lib/active_record/acts/list.rb')

diff --git a/activerecord/lib/active_record/acts/list.rb b/activerecord/lib/active_record/acts/list.rb
index e8f7f64db1..3c0105bbe6 100644
--- a/activerecord/lib/active_record/acts/list.rb
+++ b/activerecord/lib/active_record/acts/list.rb
@@ -36,19 +36,31 @@ module ActiveRecord
 
           configuration[:scope] = "#{configuration[:scope]}_id".intern if configuration[:scope].is_a?(Symbol) && configuration[:scope].to_s !~ /_id$/
           
+          if configuration[:scope].is_a?(Symbol)
+            scope_condition_method = %(
+              def scope_condition
+                if #{configuration[:scope].to_s}.nil?
+                  "#{configuration[:scope].to_s} IS NULL"
+                else
+                  "#{configuration[:scope].to_s} = \#{#{configuration[:scope].to_s}}"
+                end
+              end
+            )
+          else
+            scope_condition_method = "def scope_condition() \"#{configuration[:scope]}\" end"
+          end
+          
           class_eval <<-EOV
             include ActiveRecord::Acts::List::InstanceMethods
 
             def position_column
               '#{configuration[:column]}'
             end
-
-            def scope_condition
-              "#{configuration[:scope].is_a?(Symbol) ? configuration[:scope].to_s + " = \#{" + configuration[:scope].to_s + "}" : configuration[:scope]}"
-            end
+            
+            #{scope_condition_method}
             
             before_destroy :remove_from_list
-            before_create   :add_to_list_bottom
+            before_create  :add_to_list_bottom
           EOV
         end
       end
@@ -123,55 +135,54 @@ module ActiveRecord
         end
 
         private
-        
-        def add_to_list_top
-          increment_positions_on_all_items
-        end
+          def add_to_list_top
+            increment_positions_on_all_items
+          end
 
-        def add_to_list_bottom
-          write_attribute(position_column, bottom_position_in_list.to_i + 1)
-        end
+          def add_to_list_bottom
+            write_attribute(position_column, bottom_position_in_list.to_i + 1)
+          end
       
-        # Overwrite this method to define the scope of the list changes
-        def scope_condition() "1" end
+          # Overwrite this method to define the scope of the list changes
+          def scope_condition() "1" end
 
-        def bottom_position_in_list
-          item = bottom_item
-          item ? item.send(position_column) : 0
-        end
+          def bottom_position_in_list
+            item = bottom_item
+            item ? item.send(position_column) : 0
+          end
 
-        def bottom_item
-          self.class.find_first(
-            "#{scope_condition} ",
-            "#{position_column} DESC"
-          )
-        end
+          def bottom_item
+            self.class.find_first(
+              "#{scope_condition} ",
+              "#{position_column} DESC"
+            )
+          end
 
-        def assume_bottom_position
-          update_attribute position_column, bottom_position_in_list.to_i + 1
-        end
+          def assume_bottom_position
+            update_attribute position_column, bottom_position_in_list.to_i + 1
+          end
   
-        def assume_top_position
-          update_attribute position_column, 1
-        end
+          def assume_top_position
+            update_attribute position_column, 1
+          end
   
-        def decrement_positions_on_lower_items
-          self.class.update_all(
-            "#{position_column} = (#{position_column} - 1)",  "#{scope_condition} AND #{position_column} > #{send(position_column).to_i}"
-          )
-        end
+          def decrement_positions_on_lower_items
+            self.class.update_all(
+              "#{position_column} = (#{position_column} - 1)",  "#{scope_condition} AND #{position_column} > #{send(position_column).to_i}"
+            )
+          end
   
-        def increment_positions_on_higher_items
-          self.class.update_all(
-            "#{position_column} = (#{position_column} + 1)",  "#{scope_condition} AND #{position_column} < #{send(position_column).to_i}"
-          )
-        end
+          def increment_positions_on_higher_items
+            self.class.update_all(
+              "#{position_column} = (#{position_column} + 1)",  "#{scope_condition} AND #{position_column} < #{send(position_column).to_i}"
+            )
+          end
 
-        def increment_positions_on_all_items
-          self.class.update_all(
-            "#{position_column} = (#{position_column} + 1)",  "#{scope_condition}"
-          )
-        end
+          def increment_positions_on_all_items
+            self.class.update_all(
+              "#{position_column} = (#{position_column} + 1)",  "#{scope_condition}"
+            )
+          end
       end     
     end
   end
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