fix: preview when using *_fields DSL

app/controllers/avo/base_controller.rb

@@ -214,6 +214,8 @@ def destroy
     def preview
       @resource.hydrate(record: @record, view: Avo::ViewInquirer.new(:show), user: _current_user, params: params)
 
+      @preview_fields = @resource.get_preview_fields
+
       render layout: params[:turbo_frame].blank?
     end
 

app/views/avo/base/preview.html.erb

@@ -4,9 +4,9 @@
       <div class="text-md font-semibold uppercase text-gray-800">Previewing <%= @resource.record_title %></div>
     <% end %>
 
-    <% if @resource.get_preview_fields.present? %>
+    <% if @preview_fields.present? %>
       <div class="mt-0 divide-y border-t">
-        <% @resource.get_preview_fields.each_with_index do |field, index| %>
+        <% @preview_fields.each_with_index do |field, index| %>
           <%= render field
             .hydrate(
               resource: @resource,

lib/avo/resources/base.rb

@@ -298,9 +298,17 @@ def detect_fields
       end
 
       def fetch_fields
+        if view.preview?
+          [:fields, :index_fields, :show_fields, :display_fields].each do |fields_method|
+            send(fields_method) if respond_to?(fields_method)
+          end
+
+          return
+        end
+
         possible_methods_for_view = VIEW_METHODS_MAPPING[view.to_sym]
 
-        # Safe navigation operator is used because the view can be "destroy" or "preview"
+        # Safe navigation operator is used because the view can be "destroy"
         possible_methods_for_view&.each do |method_for_view|
           return send(method_for_view) if respond_to?(method_for_view)
         end