Use string interpolation

app/decorators/entreprise_decorator.rb

@@ -2,7 +2,7 @@ class EntrepriseDecorator < Draper::Decorator
   delegate_all
 
   def raison_sociale_or_name
-    raison_sociale.blank? ? nom + ' ' + prenom : raison_sociale
+    raison_sociale.blank? ? "#{nom} #{prenom}" : raison_sociale
   end
 
   def effectif

app/jobs/find_dubious_procedures_job.rb

@@ -9,7 +9,7 @@ class FindDubiousProceduresJob < ApplicationJob
   def perform(*args)
     # \\y is a word boundary
     forbidden_regexp = FORBIDDEN_KEYWORDS
-      .map { |keyword| '\\y' + keyword + '\\y' }
+      .map { |keyword| "\\y#{keyword}\\y" }
       .join('|')
 
     # ~* -> case insensitive regexp match

app/models/champ.rb

@@ -52,7 +52,7 @@ class Champ < ActiveRecord::Base
   end
 
   def self.departements
-    JSON.parse(Carto::GeoAPI::Driver.departements).map { |liste| liste['code'] + ' - ' + liste['nom'] }.push('99 - Étranger')
+    JSON.parse(Carto::GeoAPI::Driver.departements).map { |liste| "#{liste['code']} - #{liste['nom']}" }.push('99 - Étranger')
   end
 
   def self.pays

app/services/pieces_justificatives_service.rb

@@ -8,7 +8,7 @@ class PiecesJustificativesService
       .partition { |_, content| ClamavService.safe_file?(content.path) }
 
     errors = with_virus
-      .map { |_, content| content.original_filename + ' : virus détecté' }
+      .map { |_, content| "#{content.original_filename} : virus détecté" }
 
     errors += without_virus
       .map { |tpj, content| save_pj(content, dossier, tpj, user) }
@@ -26,7 +26,7 @@ class PiecesJustificativesService
       pj.save
     else
       pj = PieceJustificative.new
-      pj.errors.add(:content, content.original_filename + ': <b>Virus détecté !!</b>')
+      pj.errors.add(:content, "#{content.original_filename} : <b>Virus détecté !!</b>")
     end
 
     pj

app/services/render_partial_service.rb

@@ -17,7 +17,7 @@ class RenderPartialService
   def self.left_panel_exist? left_panel_url
     file = left_panel_url.split('/').last
 
-    File.exist?(Rails.root.join('app','views', 'layouts', 'left_panels', '_' + file + '.html.haml'))
+    File.exist?(Rails.root.join('app','views', 'layouts', 'left_panels', "_#{file}.html.haml"))
   end
 
   private
@@ -31,6 +31,6 @@ class RenderPartialService
   end
 
   def retrieve_name
-    controller.to_s.parameterize.underscore + '_' + method.to_s
+    "#{controller.to_s.parameterize.underscore}_#{method.to_s}"
   end
 end

config/initializers/features.rb

@@ -8,8 +8,8 @@ require 'yaml'
 # ansible config
 class Features
   class << self
-    if File.exist?(File.dirname(__FILE__) + '/features.yml')
+    if File.exist?("#{File.dirname(__FILE__)}/features.yml")
-      features_map = YAML.load_file(File.dirname(__FILE__) + '/features.yml')
+      features_map = YAML.load_file("#{File.dirname(__FILE__)}/features.yml")
       if features_map
         features_map.each do |feature, is_active|
           define_method("#{feature}") do

config/initializers/storage_url.rb

@@ -1 +1 @@
-STORAGE_URL = "https://storage.apientreprise.fr/" + CarrierWave::Uploader::Base.fog_directory + '/'
+STORAGE_URL = "https://storage.apientreprise.fr/#{CarrierWave::Uploader::Base.fog_directory}/"

spec/controllers/users/description_controller_shared_example.rb

@@ -279,7 +279,7 @@ shared_examples 'description_controller_spec' do
       it { expect(response).to redirect_to users_dossier_recapitulatif_path }
 
       context 'when champs is type_de_champ datetime' do
-        it { expect(dossier.champs.find(dossier_datetime_champ_id).value).to eq(dossier_date_value + ' ' + dossier_hour_value + ':' + dossier_minute_value) }
+        it { expect(dossier.champs.find(dossier_datetime_champ_id).value).to eq("#{dossier_date_value} #{dossier_hour_value}:#{dossier_minute_value}") }
       end
 
       context 'when champs value is empty' do

spec/decorators/entreprise_decorator_spec.rb

@@ -27,7 +27,7 @@ describe EntrepriseDecorator do
     context 'when raison_sociale is nil' do
       let(:raison_sociale) { nil }
       it 'display nom and prenom' do
-        expect(subject).to eq(nom + ' ' + prenom)
+        expect(subject).to eq("#{nom} #{prenom}")
       end
     end
   end

spec/services/render_partial_service_spec.rb

@@ -8,12 +8,12 @@ describe RenderPartialService do
   describe 'navbar' do
     subject { service.navbar }
 
-    it { is_expected.to eq 'layouts/navbars/navbar_' + controller.to_s.parameterize + '_' + method.to_s }
+    it { is_expected.to eq "layouts/navbars/navbar_#{controller.to_s.parameterize}_#{method.to_s}" }
   end
 
   describe 'left_panel' do
     subject { service.left_panel }
 
-    it { is_expected.to eq 'layouts/left_panels/left_panel_' + controller.to_s.parameterize + '_' + method.to_s }
+    it { is_expected.to eq "layouts/left_panels/left_panel_#{controller.to_s.parameterize}_#{method.to_s}" }
   end
 end