Question

I can’t find why I get the following error in my view when using any method that has_many provides to its collection (such as ‘where’) :

NameError in History/hist_paquets_mesures#show
Showing /var/www-opf/opf/app/views/history/hist_paquets_mesures/show.html.haml where line #19 raised:
uninitialized constant HistPaquetMesures::HistVersionsPaquetsMesure

The part of my (HAML) view causing this issue :

// I want to make this work
//= @hist_paquet_mesures.hist_versions_paquets_mesures.where(:hist_origine_modification == nil).first.version
// So I debug with this, which is causing the same error
= debug @hist_paquet_mesures.hist_versions_paquets_mesures

I set up an exception for the special singular-plural names that I use in config/initializers/inflections.rb :

  ActiveSupport::Inflector.inflections do |inflect|
    inflect.irregular 'pub_liste_horizon', 'pub_listes_horizon'
    inflect.irregular 'hist_paquet_mesures', 'hist_paquets_mesures'
    inflect.irregular 'hist_projet_connexe', 'hist_projets_connexes'
    inflect.irregular 'hist_version_paquet_mesures', 'hist_versions_paquets_mesures'
    inflect.irregular 'hist_origine_modification', 'hist_origines_modification'
  end

Pluralize , singularize and classify methods are working as expected on rails console :

"hist_versions_paquets_mesures".singularize  => "hist_version_paquet_mesures"
"hist_versions_paquets_mesures".classify  => "HistVersionPaquetMesures"
"hist_version_paquet_mesures".pluralize  => "hist_versions_paquets_mesures"

My app/model/hist_paquet_mesures.rb model :

class HistPaquetMesures < ActiveRecord::Base
  belongs_to :pub_indice
  belongs_to :pub_liste_horizon
  belongs_to :admin_utilisateur
  has_many :hist_versions_paquets_mesures
end

My app/model/hist_version_paquet_mesures.rb model :

class HistVersionPaquetMesures < ActiveRecord::Base
  belongs_to :hist_paquet_mesures
  belongs_to :pub_modification
  belongs_to :vers_origine, :class_name => 'HistOrigineModification', :foreign_key => 'hist_origine_modification_id'
  # polymorphic association
  has_one :comme_origine, :class_name => 'HistOrigineModification', as: :hist_origine
end

My app/controllers/history/hist_paquets_mesures_controller.rb controller :

class History::HistPaquetsMesuresController < ApplicationController
  def show
    @hist_paquet_mesures = HistPaquetMesures.find_by_id(params[:id])
    respond_with(:history, @hist_paquet_mesures)
  end
end

The weird thing is where the “s” go in “HistVersionsPaquetsMesure” of the error message : HistPaquetMesures::HistVersionsPaquetsMesure

Shouldn’t it be HistPaquetMesures::HistVersionPaquetMesures ?
Why do I have this result ?

Any help is welcome

Answer 1

It’s a BUG !

I opened an issue on this case.
It seems the problem comes from ActiveSupport library.
To get the class name it performs a “camelize.singularize”. As my inflections are defined with underscore, the expected result is incorrect. It would have worked if the library had performed a “singularize.camelize”.

Workaround : add another irregular inflection with camelized syntax.