Module: Lore::Behaviours::Movable

Defined in:
lib/lore/behaviours/movable.rb

Overview

Move an entity within a given criteria range, e.g. within nodes of a tree.

Usage: 

class My_Model < Lore::Model
extend Lore::Behaviours::Movable
include Lore::Behaviours::Movable_Entity
 # ...
 ordered_by(:position)
end

# Will move entity to position 12 within child entries
# of node with id 2: 
my_model_entity.move_to(12, (My_Model.parent_id == 2))
# Same as
My_Model.move(my_model_entity, 12, (My_Model.parent_id == 2))

Instance Method Summary collapse

Instance Method Details

#move(inst, sortpos, criteria) ⇒ Object 



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# File 'lib/lore/behaviours/movable.rb', line 30

def move(inst, sortpos, criteria)
  sortpos = sortpos.to_i
  return if sortpos < 1

  criteria ||= Lore::Clause.new()
  sortpos_old = inst.attr[@order_attr_name].to_i

  # move down: 
  if sortpos.to_i > sortpos_old then
    self.update { |na|
      na.set({@order_attr_name => @order_attr-1}).where(
        (criteria) &
        (@order_attr <= sortpos) &
        (@order_attr > sortpos_old)
      )
    }
  # move up: 
  elsif sortpos.to_i < sortpos_old then
    self.update { |na|
      na.set({@order_attr_name => @order_attr+1}).where(
        (criteria) &
        (@order_attr >= sortpos) &
        (@order_attr < sortpos_old)
      )
    }
  end
  # In case we actually had to move the entity: 
  if sortpos != sortpos_old then
    inst.set_attribute_value(@order_attr_name, sortpos)
    inst.commit()
  end
end

#ordered_by(attrib) ⇒ Object 



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# File 'lib/lore/behaviours/movable.rb', line 25

def ordered_by(attrib)
  @order_attr = attrib
  @order_attr_name = attrib.to_s.split('.')[-1].intern
end