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author | David Heinemeier Hansson <david@loudthinking.com> | 2004-12-08 15:53:57 +0000 |
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committer | David Heinemeier Hansson <david@loudthinking.com> | 2004-12-08 15:53:57 +0000 |
commit | 55be0a3cb518b345fa659629c4f2829faf745fab (patch) | |
tree | 6047b074823353a2a0354f60df27f9f9593e69f0 /activerecord/lib/active_record/mixins/list_mixin.rb | |
parent | 2d483af0d7c3d17f5b22b702bc93c95a9e7d99da (diff) | |
download | rails-55be0a3cb518b345fa659629c4f2829faf745fab.tar.gz rails-55be0a3cb518b345fa659629c4f2829faf745fab.tar.bz2 rails-55be0a3cb518b345fa659629c4f2829faf745fab.zip |
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
Diffstat (limited to 'activerecord/lib/active_record/mixins/list_mixin.rb')
-rw-r--r-- | activerecord/lib/active_record/mixins/list_mixin.rb | 154 |
1 files changed, 0 insertions, 154 deletions
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
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