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Contents
# Positionable automatically adds the last position number to ActiveRecord models
# in the `position` column. It only set's the position if it isn't set yet.
#
# By defining an optional scope the position numbering will only look inside a certain scope.
#
# @example Usage:
# class Model < ActiveRecord::Base
# include Skyline::Positionable
# self.positionable_scope = :parent_id # (Optional)
# end
#
module Skyline::Positionable
def self.included(base)
base.extend(ClassMethods)
base.send :before_save, :set_position
end
module ClassMethods
# Get the positionable_scope for this class (uses an instance variable on class level)
#
# @return [String,Symbol] The scope to look in
def positionable_scope
@positionable_scope
end
# Set the positionable_sope for this class
#
# @param scope [String,Symbol] The scope to use, mostly a column name.
# @return [String,Symbol] The scope that has just been set.
def positionable_scope=(scope)
@positionable_scope = scope
end
end
protected
def set_position
return unless self.position.nil?
if self.class.positionable_scope
self.position = self.class.find_by_sql(["SELECT MAX(position) as position FROM #{self.class.table_name} WHERE #{self.class.positionable_scope}=?", self.send(self.class.positionable_scope)]).first["position"].to_i + 1
else
self.position = self.class.find_by_sql("SELECT MAX(position) as position FROM #{self.class.table_name}").first["position"].to_i + 1
end
end
end
Version data entries
7 entries across 7 versions & 2 rubygems