FEATURE: add transformer to pass topic ID to simple invite generation (#29861)

app/assets/javascripts/discourse/app/components/modal/create-invite.gjs

@@ -14,6 +14,7 @@ import FutureDateInput from "discourse/components/future-date-input";
 import { extractError } from "discourse/lib/ajax-error";
 import { canNativeShare, nativeShare } from "discourse/lib/pwa-utils";
 import { sanitize } from "discourse/lib/text";
+import { applyValueTransformer } from "discourse/lib/transformer";
 import { emailValid, hostnameValid } from "discourse/lib/utilities";
 import Group from "discourse/models/group";
 import Invite from "discourse/models/invite";
@@ -248,11 +249,17 @@ export default class CreateInvite extends Component {
   @action
   async createLink() {
     this.sendEmail = false;
+
+    const topicId = applyValueTransformer("invite-simple-mode-topic", null, {
+      invite: this.invite,
+    });
+
     await this.save({
       max_redemptions_allowed: this.defaultRedemptionsAllowed,
       expires_at: moment()
         .add(this.siteSettings.invite_expiry_days, "days")
         .format(DATE_INPUT_FORMAT),
+      ...(topicId != null && { topic_id: topicId }),
     });
   }
 

app/assets/javascripts/discourse/app/lib/transformer/registry.js

@@ -10,6 +10,7 @@ export const VALUE_TRANSFORMERS = Object.freeze([
   "header-notifications-avatar-size",
   "home-logo-href",
   "home-logo-image-url",
+  "invite-simple-mode-topic",
   "mentions-class",
   "more-topics-tabs",
   "post-menu-buttons",