[#835] Extract avis creation into concern

app/controllers/concerns/create_avis_concern.rb

@@ -0,0 +1,26 @@
+module CreateAvisConcern
+  extend ActiveSupport::Concern
+
+  private
+
+  def create_avis_from_params(dossier, confidentiel = false)
+    confidentiel ||= create_avis_params[:confidentiel]
+    avis = Avis.new(create_avis_params.merge(claimant: current_gestionnaire, dossier: dossier, confidentiel: confidentiel))
+
+    if avis.save
+      flash.notice = "Une demande d'avis a été envoyée à #{avis.email_to_display}"
+
+      nil
+    else
+      flash.now.alert = @avis.errors.full_messages
+
+      # When an error occurs, return the avis back to the controller
+      # to give the user a chance to correct and resubmit
+      avis
+    end
+  end
+
+  def create_avis_params
+    params.require(:avis).permit(:email, :introduction, :confidentiel)
+  end
+end