DEV: Plugin modifier application for About admins (#27261)

app/models/about.rb

@@ -59,7 +59,11 @@ class About
   end
 
   def admins
-    @admins ||= User.where(admin: true).human_users.order("last_seen_at DESC")
+    @admins ||=
+      DiscoursePluginRegistry.apply_modifier(
+        :about_admins,
+        User.where(admin: true).human_users.order("last_seen_at DESC"),
+      )
   end
 
   def stats

spec/models/about_spec.rb

@@ -112,4 +112,22 @@ RSpec.describe About do
       results.each { |res| expect(res.moderators.size).to eq(2) }
     end
   end
+
+  describe "#admins" do
+    fab!(:admin_mark) { Fabricate(:admin, name: "mark") }
+    fab!(:admin_matt) { Fabricate(:admin, name: "matt") }
+    fab!(:admin_kate) { Fabricate(:admin, name: "kate") }
+
+    context "with about_admins plugin modifier registered" do
+      let(:modifier_block) { Proc.new { |admins| admins.select { |admin| admin.name != "mark" } } }
+
+      it "Applies registered modifiers (filtering out admins in this case)" do
+        plugin_instance = Plugin::Instance.new
+        plugin_instance.register_modifier(:about_admins, &modifier_block)
+        expect(About.new(Fabricate(:user)).admins).to match_array([admin_matt, admin_kate])
+      ensure
+        DiscoursePluginRegistry.unregister_modifier(plugin_instance, :about_admins, &modifier_block)
+      end
+    end
+  end
 end