Module: ActiveRecord::Acts::List::InstanceMethods Deprecated

Defined in:
lib/plugins/acts_as_list/lib/active_record/acts/list.rb

Overview

Deprecated.

Removed at 4.0.0

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.

Since:

  • 2.0.0

Instance Method Summary collapse

Instance Method Details

#decrement_position ⇒ Object

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



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# File 'lib/plugins/acts_as_list/lib/active_record/acts/list.rb', line 162

def decrement_position
  return unless in_list?
  update_attribute position_column, self.send(position_column).to_i - 1
end

#first? ⇒ Boolean

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

Returns:

  • (Boolean) 


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# File 'lib/plugins/acts_as_list/lib/active_record/acts/list.rb', line 168

def first?
  return false unless in_list?
  self.send(position_column) == 1
end

#higher_item ⇒ Object

Return the next higher item in the list.



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# File 'lib/plugins/acts_as_list/lib/active_record/acts/list.rb', line 180

def higher_item
  return nil unless in_list?
  acts_as_list_class.where(
    "#{scope_condition} AND #{position_column} = #{(send(position_column).to_i - 1).to_s}"
  ).first
end

#in_list? ⇒ Boolean

Test if this record is in a list

Returns:

  • (Boolean) 


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# File 'lib/plugins/acts_as_list/lib/active_record/acts/list.rb', line 196

def in_list?
  !send(position_column).nil?
end

#increment_position ⇒ Object

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



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# File 'lib/plugins/acts_as_list/lib/active_record/acts/list.rb', line 156

def increment_position
  return unless in_list?
  update_attribute position_column, self.send(position_column).to_i + 1
end

#insert_at(position = 1) ⇒ Object

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



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# File 'lib/plugins/acts_as_list/lib/active_record/acts/list.rb', line 79

def insert_at(position = 1)
  insert_at_position(position)
end

#last? ⇒ Boolean

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

Returns:

  • (Boolean) 


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# File 'lib/plugins/acts_as_list/lib/active_record/acts/list.rb', line 174

def last?
  return false unless in_list?
  self.send(position_column) == bottom_position_in_list
end

#lower_item ⇒ Object

Return the next lower item in the list.



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# File 'lib/plugins/acts_as_list/lib/active_record/acts/list.rb', line 188

def lower_item
  return nil unless in_list?
  acts_as_list_class.where(
    "#{scope_condition} AND #{position_column} = #{(send(position_column).to_i + 1).to_s}"
  ).first
end

#move_higher ⇒ Object

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



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# File 'lib/plugins/acts_as_list/lib/active_record/acts/list.rb', line 94

def move_higher
  return unless higher_item

  acts_as_list_class.transaction do
    higher_item.increment_position
    decrement_position
  end
end

#move_lower ⇒ Object

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



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# File 'lib/plugins/acts_as_list/lib/active_record/acts/list.rb', line 84

def move_lower
  return unless lower_item

  acts_as_list_class.transaction do
    lower_item.decrement_position
    increment_position
  end
end

#move_to=(pos) ⇒ Object

Move to the given position



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# File 'lib/plugins/acts_as_list/lib/active_record/acts/list.rb', line 124

def move_to=(pos)
  case pos.to_s
  when 'highest'
    move_to_top
  when 'higher'
    move_higher
  when 'lower'
    move_lower
  when 'lowest'
    move_to_bottom
  end
  reset_positions_in_list
end

#move_to_bottom ⇒ Object

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



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# File 'lib/plugins/acts_as_list/lib/active_record/acts/list.rb', line 105

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 ⇒ Object

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



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# File 'lib/plugins/acts_as_list/lib/active_record/acts/list.rb', line 115

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 ⇒ Object

Removes the item from the list.



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# File 'lib/plugins/acts_as_list/lib/active_record/acts/list.rb', line 148

def remove_from_list
  if in_list?
    decrement_positions_on_lower_items
    update_attribute position_column, nil
  end
end

#reset_positions_in_list ⇒ Object

Since:

  • 2.0.3



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# File 'lib/plugins/acts_as_list/lib/active_record/acts/list.rb', line 138

def reset_positions_in_list
  acts_as_list_class.where(scope_condition).reorder("#{position_column} ASC, id ASC").each_with_index do |item, i|
    unless item.send(position_column) == (i + 1)
      acts_as_list_class.where({:id => item.id}).
        update_all({position_column => (i + 1)})
    end
  end
end