Resolve #414 Add Language Support

* Return question text and response text in English by default, but use the headers provided by ACCEPT_LANGUAGE to pick the available language.

backend/Gemfile

@@ -9,6 +9,7 @@ gem 'bootsnap', require: false
 gem 'devise'
 gem 'devise-jwt'
 gem 'faraday'
+gem 'http_accept_language'
 gem 'jbuilder'
 gem 'newrelic_rpm'
 gem 'pg', '~> 1.1'

backend/Gemfile.lock

@@ -115,6 +115,7 @@ GEM
     faraday-net_http (3.0.2)
     globalid (1.1.0)
       activesupport (>= 5.0)
+    http_accept_language (2.1.1)
     i18n (1.14.1)
       concurrent-ruby (~> 1.0)
     io-console (0.6.0)
@@ -287,6 +288,7 @@ DEPENDENCIES
   devise-jwt
   factory_bot_rails
   faraday
+  http_accept_language
   jbuilder
   newrelic_rpm
   pg (~> 1.1)

backend/app/controllers/surveys_controller.rb

@@ -1,6 +1,7 @@
 # frozen_string_literal: true
 
 class SurveysController < ApplicationController
+  AVAILABLE_LANGUAGES = %w(en es)
   before_action :set_survey, only: %i[show edit update destroy]
 
   # GET /surveys or /surveys.json
@@ -9,7 +10,9 @@ def index
   end
 
   # GET /surveys/1 or /surveys/1.json
-  def show; end
+  def show
+    @language = http_accept_language.preferred_language_from(AVAILABLE_LANGUAGES)
+  end
 
   # GET /surveys/new
   def new

backend/app/models/localized_survey_question.rb

@@ -0,0 +1,5 @@
+# frozen_string_literal: true
+
+class LocalizedSurveyQuestion < ApplicationRecord
+  belongs_to :survey_question
+end

backend/app/models/survey_question.rb

@@ -3,6 +3,20 @@
 class SurveyQuestion < ApplicationRecord
   belongs_to :survey
   enum response_type: { radio: 0, text: 1 }
+  has_many :localized_survey_questions
+  accepts_nested_attributes_for :localized_survey_questions
 
   validates :display_order, uniqueness: { scope: :survey_id }
+
+  after_initialize do
+    @language ||= 'en'
+  end
+
+  def text
+    localized_survey_questions.find_by(language_code: @language_code).text
+  end
+
+  def response_options
+    localized_survey_questions.find_by(language_code: @language_code).response_options
+  end
 end

backend/db/migrate/20230920000437_create_localized_survey_questions.rb

@@ -0,0 +1,14 @@
+class CreateLocalizedSurveyQuestions < ActiveRecord::Migration[7.0]
+  def change
+    create_table :localized_survey_questions do |t|
+      t.string :language_code
+      t.text :text
+      t.string :response_options, array: true
+      t.references :survey_question
+
+      t.timestamps
+    end
+    remove_column :survey_questions, :text, :text
+    remove_column :survey_questions, :response_options, :string, array: true
+  end
+end

backend/db/seed_importer.rb

@@ -25,7 +25,17 @@ def import_seed_data(path, clustered_ordered_parcels)
       chunk.each do |data_hash|
         data_hash[:response_options] =
           (data_hash[:response_options].nil? ? [] : data_hash[:response_options].split('/', -1))
-        question = SurveyQuestion.new(data_hash)
+          fixed_data_hash = {
+            display_order: data_hash[:display_order],
+            response_type: data_hash[:response_type],
+            localized_survey_questions: [
+              LocalizedSurveyQuestion.new({
+              text: data_hash[:text],
+              response_options: data_hash[:response_options],
+              language_code: 'en'
+            })]
+          }
+        question = SurveyQuestion.new(fixed_data_hash)
         question.survey = survey
         question.save!
       end