Assign users and gestionnaires to commentaires

fix #2052

app/services/commentaire_service.rb

@@ -1,16 +1,18 @@
 class CommentaireService
   class << self
-    def create(sender, dossier, params)
-      attributes = params.merge(email: sender.email, dossier: dossier)
-
-      # If the user submits a empty message, simple_format will replace '' by '<p></p>',
-      # and thus bypass the not-empty constraint on commentaire's body.
-      #
-      # To avoid this, format the message only if a body is present in the first place.
-      if attributes[:body].present?
-        attributes[:body] = ActionController::Base.helpers.simple_format(attributes[:body])
+    def build(sender, dossier, params)
+      case sender
+      when User
+        params[:user] = sender
+      when Gestionnaire
+        params[:gestionnaire] = sender
       end
 
+      build_with_email(sender.email, dossier, params)
+    end
+
+    def build_with_email(email, dossier, params)
+      attributes = params.merge(email: email, dossier: dossier)
       Commentaire.new(attributes)
     end
   end