AR: Undefined attribute method on abstract_class

rubyonrails-talk
1

NameError: undefined method content' for class LibraryFramework’

from /Users/itsmechlark/.rvm/gems/ruby-2.1.5/gems/activesupport-4.1.8/lib/active_support/core_ext/module/aliasing.rb:32:in `alias_method'

from /Users/itsmechlark/.rvm/gems/ruby-2.1.5/gems/activesupport-4.1.8/lib/active_support/core_ext/module/aliasing.rb:32:in `alias_method_chain'

from /Users/itsmechlark/Desktop/GitHub/itsmechlark/cdasiaonline/app/models/library_framework.rb:134:in `<class:LibraryFramework>'

from /Users/itsmechlark/Desktop/GitHub/itsmechlark/cdasiaonline/app/models/library_framework.rb:2:in `<top (required)>'

from /Users/itsmechlark/.rvm/gems/ruby-2.1.5/gems/activesupport-4.1.8/lib/active_support/dependencies.rb:443:in `load'

from /Users/itsmechlark/.rvm/gems/ruby-2.1.5/gems/activesupport-4.1.8/lib/active_support/dependencies.rb:443:in `block in load_file'

from /Users/itsmechlark/.rvm/gems/ruby-2.1.5/gems/activesupport-4.1.8/lib/active_support/dependencies.rb:633:in `new_constants_in'

from /Users/itsmechlark/.rvm/gems/ruby-2.1.5/gems/activesupport-4.1.8/lib/active_support/dependencies.rb:442:in `load_file'

from /Users/itsmechlark/.rvm/gems/ruby-2.1.5/gems/activesupport-4.1.8/lib/active_support/dependencies.rb:342:in `require_or_load'

from /Users/itsmechlark/.rvm/gems/ruby-2.1.5/gems/activesupport-4.1.8/lib/active_support/dependencies.rb:480:in `load_missing_constant'

from /Users/itsmechlark/.rvm/gems/ruby-2.1.5/gems/activesupport-4.1.8/lib/active_support/dependencies.rb:180:in `const_missing'

from /Users/itsmechlark/Desktop/GitHub/itsmechlark/cdasiaonline/app/models/sec.rb:1:in `<top (required)>'

class LibraryFramework < ActiveRecord::Base
  self.abstract_class = true

def content_with_corrector justified = self.class.justify_content(content_without_corrector) self.class.check_replace_invalid_format(justified) end alias_method_chain :content, :corrector

end

class Sec < LibraryFramework
  BANNER = 'Taxation'
  MIN_YEAR = 1980

  validates :docdate, date: true,
            inclusion: {
                in: Date.new(MIN_YEAR)..Time.now.to_date,
                message: "The date must be between #{Date.new(MIN_YEAR)} and #{Time.now.to_date}"},
            :if => lambda{ |object| object.doc_date.present? }
  validates :year, :inclusion => { :in => MIN_YEAR..(Time.now.year),
                                   :message => "The year must be between #{MIN_YEAR} and #{Time.now.year}" },
            :if => lambda{ |object| object.year.present? }

end
2

Well this class doesn’t have a content method. If content is an accessor method generated by active record for a database column of the same name then the issue is that the abstract class has no table and this no columns. You might be able to use the inherited hook to add this override when your class is corrected

Also in recent versions of rails the accessor methods are generated in a module included in the class - i don’t thing you need to use alias_method_chain anymore - normal inheritance will do the job, so you might be able to get away with just

def content

justified = self.class.justify_content(super)

self.class.check_replace_invalid_format(justified)

end

Even if you’re not on the right rails version, you can use read_attribute instead of calling super.

Fred