FIX: Only send membership request to the last 5 active group owners.

app/assets/javascripts/discourse/components/group-membership-button.js.es6

@@ -1,5 +1,6 @@
 import { default as computed } from 'ember-addons/ember-computed-decorators';
 import { popupAjaxError } from 'discourse/lib/ajax-error';
+import Group from 'discourse/models/group';
 
 export default Ember.Component.extend({
   @computed("model.public")
@@ -64,9 +65,13 @@ export default Ember.Component.extend({
 
     requestMembership() {
       const groupName = this.get('model.name');
-      const title = I18n.t('groups.request_membership_pm.title');
-      const body = I18n.t('groups.request_membership_pm.body', { groupName });
-      this.sendAction("createNewMessageViaParams", groupName, title, body);
+
+      Group.loadOwners(groupName).then(result => {
+        const names = result.map(owner => owner.username).join(",");
+        const title = I18n.t('groups.request_membership_pm.title');
+        const body = I18n.t('groups.request_membership_pm.body', { groupName });
+        this.sendAction("createNewMessageViaParams", names, title, body);
+      });
     }
   }
 });

app/assets/javascripts/discourse/models/group.js.es6

@@ -2,6 +2,7 @@ import { ajax } from 'discourse/lib/ajax';
 import { default as computed, observes } from "ember-addons/ember-computed-decorators";
 import GroupHistory from 'discourse/models/group-history';
 import RestModel from 'discourse/models/rest';
+import { popupAjaxError } from 'discourse/lib/ajax-error';
 
 const Group = RestModel.extend({
   limit: 50,
@@ -208,6 +209,10 @@ Group.reopenClass({
     return ajax("/groups/" + name + ".json").then(result => Group.create(result.basic_group));
   },
 
+  loadOwners(name) {
+    return ajax('/groups/' + name + '/owners.json').catch(popupAjaxError);
+  },
+
   loadMembers(name, offset, limit, params) {
     return ajax('/groups/' + name + '/members.json', {
       data: _.extend({

app/controllers/groups_controller.rb

@@ -141,6 +141,16 @@ class GroupsController < ApplicationController
     }
   end
 
+  def owners
+    group = find_group(:group_id)
+
+    owners = group.users.where('group_users.owner')
+      .order("users.last_seen_at DESC")
+      .limit(5)
+
+    render_serialized(owners, GroupUserSerializer)
+  end
+
   def add_members
     group = Group.find(params[:id])
     group.public ? ensure_logged_in : guardian.ensure_can_edit!(group)

app/models/user_search.rb

@@ -1,4 +1,6 @@
 # Searches for a user by username or full text or name (if enabled in SiteSettings)
+require_dependency 'search'
+
 class UserSearch
 
   def initialize(term, opts={})

config/routes.rb

@@ -404,6 +404,7 @@ Discourse::Application.routes.draw do
     get 'activity' => "groups#show"
     get 'activity/:filter' => "groups#show"
     get 'members'
+    get 'owners'
     get 'posts'
     get 'topics'
     get 'mentions'

spec/integration/groups_spec.rb

@@ -151,6 +151,26 @@ describe "Groups" do
     end
   end
 
+  describe 'owners' do
+    let(:user1) { Fabricate(:user, last_seen_at: Time.zone.now) }
+    let(:user2) { Fabricate(:user, last_seen_at: Time.zone.now - 1 .day) }
+    let(:group) { Fabricate(:group, users: [user1, user2]) }
+
+    it 'should return the right list of owners' do
+      group.add_owner(user1)
+      group.add_owner(user2)
+
+      xhr :get, "/groups/#{group.name}/owners"
+
+      expect(response).to be_success
+
+      owners = JSON.parse(response.body)
+
+      expect(owners.count).to eq(2)
+      expect(owners.map { |o| o["id"] }.sort).to eq([user1.id, user2.id])
+    end
+  end
+
   describe 'members' do
     let(:user1) do
       Fabricate(:user,