invite: support remote forms

This allows to keep the draft content when inviting a new user.

app/controllers/invites_controller.rb

@@ -24,7 +24,10 @@ class InvitesController < ApplicationController
       flash.alert = invite.errors.full_messages
     end
 
-    redirect_back(fallback_location: helpers.url_for_dossier(dossier))
+    respond_to do |format|
+      format.html { redirect_back(fallback_location: helpers.url_for_dossier(dossier)) }
+      format.js { @dossier = dossier }
+    end
   end
 
   private

app/views/invites/_form.html.haml

@@ -12,6 +12,6 @@
     %p Vous pouvez inviter quelqu’un à remplir ce dossier avec vous.
     %p Cette personne aura le droit de modifier votre dossier.
 
-  = form_tag invites_dossier_path(dossier_id: dossier.id), method: :post, class: 'form' do
+  = form_tag invites_dossier_path(dossier_id: dossier.id), remote: true, method: :post, class: 'form' do
     = email_field_tag :invite_email, '', class: 'small', placeholder: 'adresse email', required: true
     = submit_tag 'Envoyer une invitation', class: 'button accepted'

app/views/invites/create.js.erb

@@ -0,0 +1,6 @@
+var formView = "<%= escape_javascript(render partial: 'invites/form', locals: { dossier: @dossier }) %>";
+document.querySelector("#invites-form").outerHTML = formView;
+
+var flashMessagesView = "<%= escape_javascript(render partial: 'layouts/flash_messages') %>";
+document.querySelector("#flash_messages").outerHTML = flashMessagesView;
+<% flash.clear %>

app/views/layouts/_flash_messages.html.haml

@@ -1,11 +1,12 @@
-- if flash.any?
-  #flash_message.center
-    - flash.each do |key, value|
-      - if value.class == Array
-        .alert{ class: flash_class(key) }
-          - value.each do |message|
-            = sanitize(message)
-            %br
-      - else
-        .alert{ class: flash_class(key) }
-          = sanitize(value)
+#flash_messages
+  - if flash.any?
+    #flash_message.center
+      - flash.each do |key, value|
+        - if value.class == Array
+          .alert{ class: flash_class(key) }
+            - value.each do |message|
+              = sanitize(message)
+              %br
+        - else
+          .alert{ class: flash_class(key) }
+            = sanitize(value)

spec/features/new_user/invite_spec.rb

@@ -13,11 +13,15 @@ feature 'Invitations' do
       log_in(user)
       navigate_to_brouillon(dossier)
 
+      fill_in 'Libelle du champ', with: 'Some edited value'
       send_invite_to "user_invite@exemple.fr"
 
       expect(page).to have_current_path(modifier_dossier_path(dossier))
       expect(page).to have_text("Une invitation a été envoyée à user_invite@exemple.fr.")
       expect(page).to have_text("user_invite@exemple.fr")
+
+      # Ensure unsaved edits to the form are not lost
+      expect(page).to have_field('Libelle du champ', with: 'Some edited value')
     end
 
     scenario 'an invited user can see and edit the draft', js: true do