Module: MongoMapper::Plugins::SortableItem::InstanceMethods

Defined in:
lib/mm_sortable_item.rb

Instance Method Summary collapse

Instance Method Details

#add_to_list(position = bottom_of_list) ⇒ Object 



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# File 'lib/mm_sortable_item.rb', line 69

def add_to_list position = bottom_of_list
  remove_from_list
  increment_positions_on_lower_items position
  set_position position
end

#add_to_list_bottom ⇒ Object 



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# File 'lib/mm_sortable_item.rb', line 61

def add_to_list_bottom
  add_to_list
end

#add_to_list_top ⇒ Object 



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# File 'lib/mm_sortable_item.rb', line 65

def add_to_list_top
  add_to_list 1
end

#bottom_of_list ⇒ Object 



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# File 'lib/mm_sortable_item.rb', line 75

def bottom_of_list
  self.class.in_list( scoped_list_id ).count + 1
end

#decrement_positions_on_lower_items(position = self.position) ⇒ Object 



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# File 'lib/mm_sortable_item.rb', line 84

def decrement_positions_on_lower_items position = self.position
  self.class.decrement( lower_than_conditions(position), { :position => 1 } )
end

#in_list? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/mm_sortable_item.rb', line 52

def in_list?
  !send(:position).nil?
end

#increment_positions_on_lower_items(position = self.position) ⇒ Object 



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# File 'lib/mm_sortable_item.rb', line 88

def increment_positions_on_lower_items position = self.position
  self.class.increment( lower_than_conditions(position), { :position => 1 } )
end

#lower_than_conditions(position = self.position) ⇒ Object 



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# File 'lib/mm_sortable_item.rb', line 79

def lower_than_conditions position = self.position
  query = self.class.conditions_for_list_scope scoped_list_id
  query.merge( :position.gte => position )
end

#remove_from_list ⇒ Object 



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# File 'lib/mm_sortable_item.rb', line 92

def remove_from_list
  if in_list?
    decrement_positions_on_lower_items
    self.position = nil
  end
end

#scoped_list_id ⇒ Object 



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# File 'lib/mm_sortable_item.rb', line 56

def scoped_list_id
  the_column = self.class.list_scope_column
  the_column ? self.send(the_column) : nil
end

#set_position(new_position) ⇒ Object 



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# File 'lib/mm_sortable_item.rb', line 99

def set_position new_position
  remove_from_list
  increment_positions_on_lower_items new_position
  if new_position != self.position
    self.position = new_position
    save unless new_record?
  end
end