✨ [#4991] Add selection of Referentielijsten services to general config

the selected services will be shown as options when configuring select/selectboxes using Referentielijsten

src/openforms/config/admin.py

@@ -161,7 +161,15 @@ class GlobalConfigurationAdmin(TranslationAdmin, SingletonModelAdmin):
             },
         ),
         (_("Search engines"), {"fields": ("allow_indexing_form_detail",)}),
-        (_("Plugin configuration"), {"fields": ("plugin_configuration",)}),
+        (
+            _("Plugin configuration"),
+            {
+                "fields": (
+                    "plugin_configuration",
+                    "referentielijsten_services",
+                )
+            },
+        ),
         (
             _("Registration"),
             {
@@ -198,6 +206,7 @@ class GlobalConfigurationAdmin(TranslationAdmin, SingletonModelAdmin):
         ),
     )
     readonly_fields = ("feature_flags_link",)
+    filter_horizontal = ("referentielijsten_services",)
 
     @admin.display(description=_("feature flags"))
     def feature_flags_link(self, obj) -> str:

src/openforms/config/migrations/0056_globalconfiguration_referentielijsten_services.py

@@ -0,0 +1,23 @@
+# Generated by Django 4.2.17 on 2025-01-07 11:17
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("zgw_consumers", "0022_set_default_service_slug"),
+        ("config", "0055_v270_to_v300"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="globalconfiguration",
+            name="referentielijsten_services",
+            field=models.ManyToManyField(
+                help_text="List of services that are instances of the Referentielijsten API. The selected services will be shown as options when configuring select or selectboxes components to be populated from Referentielijsten.",
+                to="zgw_consumers.service",
+                verbose_name="referentielijsten services",
+            ),
+        ),
+    ]

src/openforms/config/models/config.py

@@ -13,6 +13,7 @@
 from glom import glom
 from solo.models import SingletonModel
 from tinymce.models import HTMLField
+from zgw_consumers.models import Service
 
 from openforms.data_removal.constants import RemovalMethods
 from openforms.emails.validators import URLSanitationValidator
@@ -558,6 +559,16 @@ class GlobalConfiguration(SingletonModel):
         ),
     )
 
+    referentielijsten_services = models.ManyToManyField(
+        Service,
+        verbose_name=_("referentielijsten services"),
+        help_text=_(
+            "List of services that are instances of the Referentielijsten API. "
+            "The selected services will be shown as options when configuring "
+            "select or selectboxes components to be populated from Referentielijsten."
+        ),
+    )
+
     # search engine configuration
     allow_indexing_form_detail = models.BooleanField(
         _("Allow form page indexing"),