From 55be0a3cb518b345fa659629c4f2829faf745fab Mon Sep 17 00:00:00 2001
From: David Heinemeier Hansson <david@loudthinking.com>
Date: Wed, 8 Dec 2004 15:53:57 +0000
Subject: Renamed from ListMixin and mixins/list_mixin.rb to Mixins::List and
 mixin/list.rb

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@83 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
---
 .../lib/active_record/mixins/list_mixin.rb         | 154 ---------------------
 1 file changed, 154 deletions(-)
 delete mode 100644 activerecord/lib/active_record/mixins/list_mixin.rb

(limited to 'activerecord/lib/active_record/mixins/list_mixin.rb')

diff --git a/activerecord/lib/active_record/mixins/list_mixin.rb b/activerecord/lib/active_record/mixins/list_mixin.rb
deleted file mode 100644
index 9f964f11af..0000000000
--- a/activerecord/lib/active_record/mixins/list_mixin.rb
+++ /dev/null
@@ -1,154 +0,0 @@
-module ActiveRecord
-  # This mixin provides the capabilities for sorting and reordering a number of objects in list.
-  # The class that has this mixin included needs to have a "position" column defined as an integer on
-  # the mapped database table. Further more, you need to implement the <tt>scope_condition</tt> that
-  # defines how to separate one list from another.
-  #
-  # Todo list example:
-  #
-  #   class TodoList < ActiveRecord::Base
-  #     has_many :todo_items, :order => "position"
-  #   end
-  #
-  #   class TodoItem < ActiveRecord::Base
-  #     include ListMixin
-  #     belongs_to :todo_list
-  #  
-  #     private
-  #       def scope_condition
-  #         "todo_list_id = #{todo_list_id}"
-  #       end
-  #   end
-  #
-  #   todo_list.first.move_to_bottom
-  #   todo_list.last.move_higher
-  #
-  module ListMixin
-    def self.append_features(base)
-      super
-      base.class_eval do
-        before_destroy :remove_from_list
-        after_create   :add_to_list_bottom
-      end
-    end
-
-    # Moving around on the list
-
-    def move_lower
-      return unless lower_item
-      lower_item.decrement_position
-      increment_position
-    end
-
-    def move_higher
-      return unless higher_item
-      higher_item.increment_position
-      decrement_position
-    end
-    
-    def move_to_bottom
-      decrement_positions_on_lower_items
-      assume_bottom_position
-    end
-
-    def move_to_top
-      increment_positions_on_higher_items
-      assume_top_position
-    end
-    
-
-    # Entering or existing the list
-    
-    def add_to_list_top
-      increment_positions_on_all_items
-    end
-
-    def add_to_list_bottom
-      assume_bottom_position
-    end
-
-    def remove_from_list
-      decrement_positions_on_lower_items
-    end
-
-
-    # Changing the position
-
-    def increment_position
-      self.position = position.to_i + 1
-      save
-    end
-    
-    def decrement_position
-      self.position = position.to_i - 1
-      save
-    end
-    
-    
-    # Querying the position
-    
-    def first?
-      self.position == 1
-    end
-    
-    def last?
-      self.position == bottom_position_in_list
-    end
-
-    private
-      # Overwrite this method to define the scope of the list changes
-      def scope_condition; end
-    
-      def higher_item
-        self.class.find_first(
-          "#{scope_condition} AND position = #{(position.to_i - 1).to_s}"
-        )
-      end
-    
-      def lower_item
-        self.class.find_first(
-          "#{scope_condition} AND position = #{(position.to_i + 1).to_s}"
-        )
-      end
-    
-      def bottom_position_in_list
-        item = bottom_item
-        item ? item.position : 0
-      end
-    
-      def bottom_item
-        self.class.find_first(
-          "#{scope_condition} ",
-          "position DESC"
-        )
-      end
-
-      def assume_bottom_position
-        self.position = bottom_position_in_list.to_i + 1
-        save
-      end
-      
-      def assume_top_position
-        self.position = 1
-        save
-      end
-      
-      def decrement_positions_on_lower_items
-        self.class.update_all(
-          "position = (position - 1)",  "#{scope_condition} AND position > #{position.to_i}"
-        )
-      end
-      
-      def increment_positions_on_higher_items
-        self.class.update_all(
-          "position = (position + 1)",  "#{scope_condition} AND position < #{position.to_i}"
-        )
-      end
-
-      def increment_positions_on_all_items
-        self.class.update_all(
-          "position = (position + 1)",  "#{scope_condition}"
-        )
-      end
-  end
-end
\ No newline at end of file
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