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module Kuhsaft
# If you use this mixin, your class must implement the following methods
# siblings(), returns the siblings of the same type of object
module Orderable
def self.included(base)
base.extend(ClassMethods)
base.send :include, InstanceMethods
base.after_create :set_position
end
module InstanceMethods
def increment_position
update_attribute :position, position + 1
end
def decrement_position
update_attribute :position, position - 1
end
def preceding_sibling
siblings.where('position = ?', position - 1).first
end
def succeeding_sibling
siblings.where('position = ?', position + 1).first
end
def preceding_siblings
siblings.where('position <= ?', position).where('id != ?', id)
end
def succeeding_siblings
siblings.where('position >= ?', position).where('id != ?', id)
end
def position_to_top
update_attribute :position, 1
recount_siblings_position_from 1
end
def recount_siblings_position_from(position)
counter = position
succeeding_siblings.each do |s|
counter += 1
s.update_attribute(:position, counter)
end
end
def reposition(before_id)
if before_id.blank?
position_to_top
else
update_attribute :position, self.class.position_of(before_id) + 1
recount_siblings_position_from position
end
end
def set_position
initial_position = siblings.blank? ? 1 : siblings.count + 1
update_attribute(:position, initial_position)
end
end
module ClassMethods
def position_of(id)
find(id).position rescue 1
end
end
end
end
Version data entries
19 entries across 19 versions & 2 rubygems