refactor CustomFields so with_custom_fields is available on backend

lib/App/Netdisco/Util/CustomFields.pm

@@ -0,0 +1,59 @@
+package App::Netdisco::Util::CustomFields;
+
+use Dancer ':syntax';
+use Dancer::Plugin::DBIC;
+
+use App::Netdisco::DB::ResultSet::Device;
+use App::Netdisco::DB::ResultSet::DevicePort;
+
+my @inline_device_actions = ();
+my @inline_device_port_actions = ();
+
+foreach my $config (@{ setting('custom_fields')->{'device'} || [] }) {
+  next unless $config->{'name'};
+  push @inline_device_actions, $config->{'name'};
+}
+
+foreach my $config (@{ setting('custom_fields')->{'device_port'} || [] }) {
+  next unless $config->{'name'};
+  push @inline_device_port_actions, $config->{'name'};
+}
+
+{
+  package App::Netdisco::DB::ResultSet::Device;
+
+  sub with_custom_fields {
+    my ($rs, $cond, $attrs) = @_;
+
+    return $rs
+      ->search_rs($cond, $attrs)
+      ->search({},
+        { '+columns' => {
+            map {( ('cf_'. $_) => \[ 'me.custom_fields ->> ?' => $_ ] )}
+                @inline_device_actions
+        }});
+  }
+}
+
+{
+  package App::Netdisco::DB::ResultSet::DevicePort;
+
+  sub with_custom_fields {
+    my ($rs, $cond, $attrs) = @_;
+
+    return $rs
+      ->search_rs($cond, $attrs)
+      ->search({},
+        { '+columns' => {
+            map {( ('cf_'. $_) => \[ 'me.custom_fields ->> ?' => $_ ] )}
+                @inline_device_port_actions
+        }});
+  }
+}
+
+set('_inline_actions' => [
+  map {'cf_' . $_} (@inline_device_actions, @inline_device_port_actions)
+]);
+
+true;
+