Rails 4, Simple Form - language selection

Question

I'm trying to make an app with Rails 4. I use simple form.

I have a form asking users to pick their working language.

 <%= f.input :working_languages, as: :select, collection: AVAILABLE_LANGUAGES.sort.map {|k,v| [v,k]}, label: "Select your working language" %>

I also have an available_languages.rb in my config/initializer folder

AVAILABLE_LANGUAGES = {
    en: "English", 
    de: "Deutsche", 
    fr: "Français", 
    es: "Español"
}

When I try that, I get this error. Does anyone know what it means?

NameError in Profiles#edit
profiles/_form.html.erb where line #39 raised:

uninitialized constant ActionView::CompiledTemplates::AVAILABLE_LANGUAGES

can you please paste complete code for your available_languages.rb — Vrushali Pawar
– Vrushali Pawar, Commented Jan 15, 2016 at 10:44

Vrushali Pawar · Accepted Answer · 2016-01-15 10:49:26Z

3

config/initializers/language_array.rb

module LanguageArray
  AVAILABLE_LANGUAGES = {
    en: "English", 
    de: "Deutsche", 
    fr: "Français", 
    es: "Español"
}
end

and access in your form as below:

<%= f.input :working_languages, as: :select, collection: LanguageArray::AVAILABLE_LANGUAGES.sort.map {|k,v| [v,k]}, label: "Select your working language" %>

answered Jan 15, 2016 at 10:49

Vrushali Pawar

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5 Comments

Mel Over a year ago

uninitialized constant ActionView::CompiledTemplates::LanguageArray

Vrushali Pawar Over a year ago

Have you restarted the server?

Mel Over a year ago

renaming the initialiser fixed it, except <%= @profile.working_languages.titlecase %> outputs the 'en' instead of the 'english'

Vrushali Pawar Over a year ago

<%= LanguageArray::AVAILABLE_LANGUAGES[@profile.working_languages].to_sym %> try this

Amit Sharma Over a year ago

try this <%= LanguageArray::AVAILABLE_LANGUAGES[@profile.working_languages.to_sym] %>

Community · Accepted Answer · 2017-05-23 10:27:56Z

0

A better way will be to put that in a helper & use this for your constant (which is available in your views):

#config/initializers/global_constants.rb
module GlobalConstants
    # also notice the call to 'freeze'
    LANGUAGES = {
       en: "English", 
       de: "Deutsche", 
       fr: "Français", 
       es: "Español"
    }.freeze
end

#app/helpers/application_helper.rb
module ApplicationHelper
   def available_languages
       GlobalConstants::LANGUAGES
   end
end

You'd then be able to use:

<%= f.collection_select :working_languages, available_languages, :first, :last, label: "Select your working language" %>

edited May 23, 2017 at 10:27

CommunityBot

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answered Jan 15, 2016 at 13:08

Richard Peck

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4 Comments

Mel Over a year ago

Hi Rich, I'm afraid I'm out of guesses as to why this is better. I think you might be much further advanced in your skills than I'm able to keep pace with. Having read this: rubymonk.com/learning/books/4-ruby-primer-ascent/chapters/…, I'm not sure why I'd want to freeze the user's language option. I'm afraid, I can't think what the advantage of this approach might be. Thanks anyway - I'll go with what I've got.

Richard Peck Over a year ago

You're freezing the constant. I only took that idea from the referenced answer; I thought it was nice. A constant can't be changed, variables can. Thus if you're going to declare a constant, you can't change it anyway.

Mel Over a year ago

Really not sure what that means. I think you're too advanced for me to try to understand this. I don't mind if users change their selected languages, if that's what you're referring to. Thanks anyway.

Richard Peck Over a year ago

Constants and variables are base components of programming. You declared AVAILABLE_LANGUAGES as a constant. Constants don't change, variables can. With your select form, you're changing the variable working_languages by picking from the constant

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