Module: ActiveRecord::Acts::MaterializedPath::ClassMethods

Defined in:
lib/acts_as_materialized_path.rb

Instance Method Summary collapse

Instance Method Details

#acts_as_materialized_path(options = {}) ⇒ Object 



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# File 'lib/acts_as_materialized_path.rb', line 27

def acts_as_materialized_path(options = {})
  conf = {
    :delimiter => '.',
    :base => 10,
    :column => 'materialized_path',
    :places => 3,
  }
  conf.update(options) if options.is_a?(Hash)

  unless conf[:delimiter].length == 1 &&
      (' '..'/') === conf[:delimiter]
    raise InvalidDelimiter
  end

  unless (2..36) === conf[:base]
    raise InvalidBase
  end

  conf[:adapter] =
    ActiveRecord::Base.connection.adapter_name

  #configuration settings
  write_inheritable_attribute :mp_delimiter, conf[:delimiter]
  class_inheritable_reader :mp_delimiter

  write_inheritable_attribute :mp_base, conf[:base]
  class_inheritable_reader :mp_base

  write_inheritable_attribute :mp_column, conf[:column]
  class_inheritable_reader :mp_column

  write_inheritable_attribute :mp_places, conf[:places]
  class_inheritable_reader :mp_places

  #sql helpers
  write_inheritable_attribute :mp_like, "#{mp_column} like ?"
  class_inheritable_reader :mp_like

  write_inheritable_attribute :mp_eq, "#{mp_column} = ?"
  class_inheritable_reader :mp_eq

  write_inheritable_attribute :mp_gt, "#{mp_column} > ?"
  class_inheritable_reader :mp_gt

  write_inheritable_attribute :mp_gte, "#{mp_column} >= ?"
  class_inheritable_reader :mp_gte

  write_inheritable_attribute :mp_lt, "#{mp_column} < ?"
  class_inheritable_reader :mp_lt

  write_inheritable_attribute :mp_asc, "#{mp_column} ASC"
  class_inheritable_reader :mp_asc

  write_inheritable_attribute :mp_desc, "#{mp_column} DESC"
  class_inheritable_reader :mp_desc

  limit_string = '~' # This only works with and asci collating sequence
  limit_string = 'Z'*(mp_places+1) # This works with UTF-8

  write_inheritable_attribute :mp_ancestor_limit,
  case conf[:adapter]
  when 'MySQL'
    "concat(#{mp_column}, '#{limit_string}')"
  when 'SQLServer'
    "#{mp_column} + '#{limit_string}'"
  else # ANSI SQL Syntax
    "#{mp_column} || '#{limit_string}'"
  end
  class_inheritable_reader :mp_ancestor_limit

  write_inheritable_attribute :mp_between,
  "? between #{mp_column} and #{mp_ancestor_limit}"
  class_inheritable_reader :mp_between

  #path manipulation fu
  write_inheritable_attribute :mp_regexp,
  Regexp.new("[[:alnum:]]{#{conf[:places]}}\\#{conf[:delimiter]}$")
  class_inheritable_reader :mp_regexp


  include ActiveRecord::Acts::MaterializedPath::InstanceMethods
  extend ActiveRecord::Acts::MaterializedPath::SingletonMethods

  #before_create :before_create_callback

  attr_protected conf[:column].to_sym


  #if parent set, save as child
  #if sibling set, save as sibling
  #else save as root
  attr_accessor :mp_parent_id_for_save
  attr_accessor :mp_sibling_id_for_save

  #this mucks up emacs indenting, so watch out for that
  class_eval <<-EOV
    def #{mp_column}=(newpath)
      raise InvalidAssignment
    end
  EOV

end