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()

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     # File vendor/rails/activerecord/lib/active_record/acts/list.rb, line 119
119:         def decrement_position
120:           update_attribute position_column, self.send(position_column).to_i - 1
121:         end
first?()

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     # File vendor/rails/activerecord/lib/active_record/acts/list.rb, line 123
123:         def first?
124:           self.send(position_column) == 1
125:         end
higher_item()

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     # File vendor/rails/activerecord/lib/active_record/acts/list.rb, line 131
131:         def higher_item
132:           self.class.find_first(
133:             "#{scope_condition} AND #{position_column} = #{(send(position_column).to_i - 1).to_s}"
134:           )
135:         end
increment_position()

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     # File vendor/rails/activerecord/lib/active_record/acts/list.rb, line 115
115:         def increment_position
116:           update_attribute position_column, self.send(position_column).to_i + 1
117:         end
insert_at(position = 1)

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    # File vendor/rails/activerecord/lib/active_record/acts/list.rb, line 75
75:         def insert_at(position = 1)
76:           position == 1 ? add_to_list_top : insert_at_position(position)
77:         end
last?()

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     # File vendor/rails/activerecord/lib/active_record/acts/list.rb, line 127
127:         def last?
128:           self.send(position_column) == bottom_position_in_list
129:         end
lower_item()

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     # File vendor/rails/activerecord/lib/active_record/acts/list.rb, line 137
137:         def lower_item
138:           self.class.find_first(
139:             "#{scope_condition} AND #{position_column} = #{(send(position_column).to_i + 1).to_s}"
140:           )
141:         end
move_higher()

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    # File vendor/rails/activerecord/lib/active_record/acts/list.rb, line 88
88:         def move_higher
89:           return unless higher_item
90: 
91:           self.class.transaction do
92:             higher_item.increment_position
93:             decrement_position
94:           end
95:         end
move_lower()

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    # File vendor/rails/activerecord/lib/active_record/acts/list.rb, line 79
79:         def move_lower
80:           return unless lower_item
81: 
82:           self.class.transaction do
83:             lower_item.decrement_position
84:             increment_position
85:           end
86:         end
move_to_bottom()

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     # File vendor/rails/activerecord/lib/active_record/acts/list.rb, line 97
 97:         def move_to_bottom
 98:           self.class.transaction do
 99:             decrement_positions_on_lower_items
100:             assume_bottom_position
101:           end
102:         end
move_to_top()

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     # File vendor/rails/activerecord/lib/active_record/acts/list.rb, line 104
104:         def move_to_top
105:           self.class.transaction do
106:             increment_positions_on_higher_items
107:             assume_top_position
108:           end
109:         end
remove_from_list()

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     # File vendor/rails/activerecord/lib/active_record/acts/list.rb, line 111
111:         def remove_from_list
112:           decrement_positions_on_lower_items
113:         end