async route /admin/communication/unsplash?search=ocean

app/controllers/admin/communication/unsplash_controller.rb

+class Admin::Communication::UnsplashController < Admin::Communication::ApplicationController
+  layout false
+
+  def index
+    @search = params[:search]
+    @photos = @search ? Unsplash::Photo.search(@search, 1, 18, :squarish)
+                      : []
+  end
+end

app/views/admin/application/unsplash/_selector.html.erb → app/views/admin/communication/unsplash/_selector.html.erb

-<% unless image.attached? %>
+<% if !image.attached? && text.present? %>
   <p>Voulez-vous utiliser une de ces images Unsplash ?</p>
   <div class="row">
     <% Unsplash::Photo.search(text, 1, 4, :squarish).each do |photo| %>
       <div class="col-6">
-        <%= render 'admin/application/unsplash/photo', photo: photo %>
+        <%= render 'admin/communication/unsplash/photo', photo: photo %>
       </div>
     <% end %>
   </div>
@@ -31,7 +31,7 @@
         <button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close"></button>
       </div>
       <div class="modal-body">
-        <form class="row">
+        <div class="row">
           <div class="col-lg-9">
             <input  type="text"
                     name="search"
@@ -45,12 +45,14 @@
               Chercher
             </button>
           </div>
-        </form>
+        </div>
         <div class="row">
-          <% Unsplash::Photo.search(text, 1, 18, :squarish).each do |photo| %>
-            <div class="col-6 col-lg-2">
-              <%= render 'admin/application/unsplash/photo', photo: photo %>
-            </div>
+          <% if text %>
+            <% Unsplash::Photo.search(text, 1, 18, :squarish).each do |photo| %>
+              <div class="col-6 col-lg-2">
+                <%= render 'admin/communication/unsplash/photo', photo: photo %>
+              </div>
+            <% end %>
           <% end %>
         </div>
       </div>

app/views/admin/communication/unsplash/index.html.erb

+<% @photos.each do |photo| %>
+  <div class="col-6 col-lg-2">
+    <%= render 'admin/communication/unsplash/photo', photo: photo %>
+  </div>
+<% end %>

app/views/admin/communication/website/posts/_form.html.erb

@@ -52,11 +52,9 @@
                       label: false,
                       input_html: { accept: '.jpg,.jpeg,.png,.svg' },
                       preview: true
-           %>
-           <%= f.input :featured_image_alt %>
-        </div>
-        <div class="card-body">
-          <%= render  'admin/application/unsplash/selector',
+                      %>
+          <%= f.input :featured_image_alt %>
+          <%= render  'admin/communication/unsplash/selector',
                       image: post.featured_image,
                       text: post.image_keywords %>
         </div>

config/routes/admin/communication.rb

 namespace :communication do
+  get 'unsplash' => 'unsplash#index'
   resources :websites do
     get 'home' => 'website/home#edit'
     patch 'home' => 'website/home#update'