Fix validation preventing file upload

Author: Kagemaru

app/forms/decidim_zuerich/admin/attachment_form.rb

@@ -0,0 +1,43 @@
+# frozen_string_literal: true
+
+### Decidim Zuerich Override
+#
+# Created at: 2025-08-25
+# Author: Thomas Burkhalter
+#
+# Original:
+#   Module: decidim-admin
+#   Class: app/forms/decidim/admin/attachment_form.rb
+#
+# Why?:
+#   The validation for the `link` field checks for a valid url
+#   even if a file is uploaded instead.
+#
+#   Original Code:
+#   ```ruby
+#   validates :link, url: true, if: -> { link.present? }
+#   ```
+#
+###
+
+module DecidimZuerich
+  module Admin
+    module AttachmentForm
+      extend ActiveSupport::Concern
+
+      included do
+        _validators[:link] = []
+
+        link_callbacks = _validate_callbacks.select do |callback|
+          callback.filter.attributes.include?(:link)
+        end
+
+        link_callbacks.each do |callback|
+          _validate_callbacks.delete(callback)
+        end
+
+        validates :link, url: true, if: -> { link.present? }
+      end
+    end
+  end
+end

config/initializers/decidim_zuerich_customization.rb

@@ -12,20 +12,21 @@
   INCLUDES = [
     #[Decidim::Debates::CreateDebateEvent,       DecidimZuerich::Debates::CreateDebateEvent],
     [Decidim::FormBuilder,                       DecidimZuerich::FormBuilder],
-    [Decidim::Forms::Admin::UpdateQuestionnaire, DecidimZuerich::Forms::Admin::UpdateQuestionnaire]
+    [Decidim::Forms::Admin::UpdateQuestionnaire, DecidimZuerich::Forms::Admin::UpdateQuestionnaire],
+    [Decidim::Admin::AttachmentForm,             DecidimZuerich::Admin::AttachmentForm]
   ].freeze
 
 
   PREPENDS = [
-    #[Decidim::ApplicationMailer,                   DecidimZuerich::ApplicationMailer],
-    #[Decidim::ParticipatoryProcesses::Permissions, DecidimZuerich::ParticipatoryProcesses::Permissions],
-    #[Decidim::Proposals::MapHelper,                DecidimZuerich::Proposals::MapHelper],
-    #[Decidim::System::RegisterOrganization,        DecidimZuerich::System::RegisterOrganization],
-    #[Decidim::System::UpdateOrganization,          DecidimZuerich::System::UpdateOrganization],
-    [Decidim::Upgrade::WysiwygMigrator,             DecidimZuerich::Upgrade::WysiwygMigrator],
-    [Decidim::PushNotificationMessage,              DecidimZuerich::PushNotificationMessage],
-    [Decidim::PushNotificationPresenter,            DecidimZuerich::PushNotificationPresenter],
-    [Decidim::LayoutHelper,                         DecidimZuerich::LayoutHelper]
+    #[Decidim::ApplicationMailer,                           DecidimZuerich::ApplicationMailer],
+    #[Decidim::ParticipatoryProcesses::Permissions,         DecidimZuerich::ParticipatoryProcesses::Permissions],
+    #[Decidim::Proposals::MapHelper,                        DecidimZuerich::Proposals::MapHelper],
+    #[Decidim::System::RegisterOrganization,                DecidimZuerich::System::RegisterOrganization],
+    #[Decidim::System::UpdateOrganization,                  DecidimZuerich::System::UpdateOrganization],
+    [Decidim::Upgrade::WysiwygMigrator,                     DecidimZuerich::Upgrade::WysiwygMigrator],
+    [Decidim::PushNotificationMessage,                      DecidimZuerich::PushNotificationMessage],
+    [Decidim::PushNotificationPresenter,                    DecidimZuerich::PushNotificationPresenter],
+    [Decidim::LayoutHelper,                                 DecidimZuerich::LayoutHelper]
   ].freeze
 
   OVERRIDES = [