All the methods available to a record that has had acts_as_list specified. Each method works by assuming the object to be the item in the list, so chapter.move_lower would move that chapter lower in the list of all chapters. Likewise, chapter.first? would return true if that chapter is the first in the list of all chapters.

Methods
Public Instance methods
decrement_position()
     # File vendor/rails/activerecord/lib/active_record/acts/list.rb, line 126
126:         def decrement_position
127:           return unless in_list?
128:           update_attribute position_column, self.send(position_column).to_i - 1
129:         end
first?()
     # File vendor/rails/activerecord/lib/active_record/acts/list.rb, line 131
131:         def first?
132:           return false unless in_list?
133:           self.send(position_column) == 1
134:         end
higher_item()
     # File vendor/rails/activerecord/lib/active_record/acts/list.rb, line 141
141:         def higher_item
142:           return nil unless in_list?
143:           acts_as_list_class.find(:first, :conditions =>
144:             "#{scope_condition} AND #{position_column} = #{(send(position_column).to_i - 1).to_s}"
145:           )
146:         end
in_list?()
     # File vendor/rails/activerecord/lib/active_record/acts/list.rb, line 155
155:         def in_list?
156:           !send(position_column).nil?
157:         end
increment_position()
     # File vendor/rails/activerecord/lib/active_record/acts/list.rb, line 121
121:         def increment_position
122:           return unless in_list?
123:           update_attribute position_column, self.send(position_column).to_i + 1
124:         end
insert_at(position = 1)
    # File vendor/rails/activerecord/lib/active_record/acts/list.rb, line 79
79:         def insert_at(position = 1)
80:           insert_at_position(position)
81:         end
last?()
     # File vendor/rails/activerecord/lib/active_record/acts/list.rb, line 136
136:         def last?
137:           return false unless in_list?
138:           self.send(position_column) == bottom_position_in_list
139:         end
lower_item()
     # File vendor/rails/activerecord/lib/active_record/acts/list.rb, line 148
148:         def lower_item
149:           return nil unless in_list?
150:           acts_as_list_class.find(:first, :conditions =>
151:             "#{scope_condition} AND #{position_column} = #{(send(position_column).to_i + 1).to_s}"
152:           )
153:         end
move_higher()
    # File vendor/rails/activerecord/lib/active_record/acts/list.rb, line 92
92:         def move_higher
93:           return unless higher_item
94: 
95:           acts_as_list_class.transaction do
96:             higher_item.increment_position
97:             decrement_position
98:           end
99:         end
move_lower()
    # File vendor/rails/activerecord/lib/active_record/acts/list.rb, line 83
83:         def move_lower
84:           return unless lower_item
85: 
86:           acts_as_list_class.transaction do
87:             lower_item.decrement_position
88:             increment_position
89:           end
90:         end
move_to_bottom()
     # File vendor/rails/activerecord/lib/active_record/acts/list.rb, line 101
101:         def move_to_bottom
102:           return unless in_list?
103:           acts_as_list_class.transaction do
104:             decrement_positions_on_lower_items
105:             assume_bottom_position
106:           end
107:         end
move_to_top()
     # File vendor/rails/activerecord/lib/active_record/acts/list.rb, line 109
109:         def move_to_top
110:           return unless in_list?
111:           acts_as_list_class.transaction do
112:             increment_positions_on_higher_items
113:             assume_top_position
114:           end
115:         end
remove_from_list()
     # File vendor/rails/activerecord/lib/active_record/acts/list.rb, line 117
117:         def remove_from_list
118:           decrement_positions_on_lower_items if in_list?
119:         end