Why is Rails update action redirecting to default_locale only?

Question

In my multilingual Rails app I have a ProfilesController. I am using a GET variable section to split the view into different tabs. I am also storing that variable in a session, so that it will be remembered across requests.

class ProfilesController < ApplicationController

  before_action :signed_in_user
  before_action :find_profile
  before_action :set_section, :only => [:show, :edit]

  def show
  end

  def edit
  end

  def update
    if @profile.update_attributes(profile_params)
      flash[:success] = t('profiles.flash_messages.profile_updated')
      redirect_to edit_profile_path(:section => session[:section])
    else
      @title = t("views.#{session[:section]}")
      render :edit
    end
  end

private

def find_profile
  @profile = current_user.profile
end

def set_section
  section = Profile::SECTIONS.include?(params[:section]) ? params[:section] : Profile::SECTIONS[0]
  session[:section] = section
end

What I don't understand is why my update action constantly redirects to the default_locale rather than the locale the user chose and therefore stored in the session.

Can anybody tell me what I am missing here?

This is an excerpt of my routes.rb file: (Please note that I am using a singular resource here since each user can have only one profile)

MyApp::Application.routes.draw do

  scope '(:locale)' do

    resource  :membership

    ...

    get 'change_locale', :to => 'locales#change_locale'

  end

end

---

Update:

class ApplicationController < ActionController::Base

  before_action :set_locale

  protected

  def set_locale
    if params[:locale]
      if I18n.available_locales.include?(params[:locale].to_sym)
        I18n.locale = session[:locale] || params[:locale] || I18n.default_locale
      end
    end
  end

  def default_url_options
    { :locale => I18n.locale }
  end

end

Answer 1

Try to use:

redirect_to edit_profile_path(:section => session[:section], :locale => I18n.locale)

or

class ApplicationController < ActionController::Base
  before_action :set_locale

  def default_url_options(options={})
    { locale: I18n.locale }
  end

protected
  def set_locale
    I18n.locale = (session[:locale] || params[:locale]).to_s.downcase.presence || I18n.default_locale
  end
end

this will help.