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
D
F
H
I
L
M
R
Instance Public methods
decrement_position()

Decrease the position of this item without adjusting the rest of the list.

Source: show 

# File rails/activerecord/lib/active_record/acts/list.rb, line 137
def decrement_position
  return unless in_list?
  update_attribute position_column, self.send(position_column).to_i - 1
end
first?()

Return true if this object is the first in the list.

Source: show 

# File rails/activerecord/lib/active_record/acts/list.rb, line 143
def first?
  return false unless in_list?
  self.send(position_column) == 1
end
higher_item()

Return the next higher item in the list.

Source: show 

# File rails/activerecord/lib/active_record/acts/list.rb, line 155
def higher_item
  return nil unless in_list?
  acts_as_list_class.find(:first, :conditions =>
    "#{scope_condition} AND #{position_column} = #{(send(position_column).to_i - 1).to_s}"
  )
end
in_list?()

Test if this record is in a list

Source: show 

# File rails/activerecord/lib/active_record/acts/list.rb, line 171
def in_list?
  !send(position_column).nil?
end
increment_position()

Increase the position of this item without adjusting the rest of the list.

Source: show 

# File rails/activerecord/lib/active_record/acts/list.rb, line 131
def increment_position
  return unless in_list?
  update_attribute position_column, self.send(position_column).to_i + 1
end
insert_at(position = 1)

Insert the item at the given position (defaults to the top position of 1).

Source: show 

# File rails/activerecord/lib/active_record/acts/list.rb, line 78
def insert_at(position = 1)
  insert_at_position(position)
end
last?()

Return true if this object is the last in the list.

Source: show 

# File rails/activerecord/lib/active_record/acts/list.rb, line 149
def last?
  return false unless in_list?
  self.send(position_column) == bottom_position_in_list
end
lower_item()

Return the next lower item in the list.

Source: show 

# File rails/activerecord/lib/active_record/acts/list.rb, line 163
def lower_item
  return nil unless in_list?
  acts_as_list_class.find(:first, :conditions =>
    "#{scope_condition} AND #{position_column} = #{(send(position_column).to_i + 1).to_s}"
  )
end
move_higher()

Swap positions with the next higher item, if one exists.

Source: show 

# File rails/activerecord/lib/active_record/acts/list.rb, line 93
def move_higher
  return unless higher_item

  acts_as_list_class.transaction do
    higher_item.increment_position
    decrement_position
  end
end
move_lower()

Swap positions with the next lower item, if one exists.

Source: show 

# File rails/activerecord/lib/active_record/acts/list.rb, line 83
def move_lower
  return unless lower_item

  acts_as_list_class.transaction do
    lower_item.decrement_position
    increment_position
  end
end
move_to_bottom()

Move to the bottom of the list. If the item is already in the list, the items below it have their position adjusted accordingly.

Source: show 

# File rails/activerecord/lib/active_record/acts/list.rb, line 104
def move_to_bottom
  return unless in_list?
  acts_as_list_class.transaction do
    decrement_positions_on_lower_items
    assume_bottom_position
  end
end
move_to_top()

Move to the top of the list. If the item is already in the list, the items above it have their position adjusted accordingly.

Source: show 

# File rails/activerecord/lib/active_record/acts/list.rb, line 114
def move_to_top
  return unless in_list?
  acts_as_list_class.transaction do
    increment_positions_on_higher_items
    assume_top_position
  end
end
remove_from_list()

Removes the item from the list.

Source: show 

# File rails/activerecord/lib/active_record/acts/list.rb, line 123
def remove_from_list
  if in_list?
    decrement_positions_on_lower_items
    update_attribute position_column, nil
  end
end