FIX: Direct link to group activity page results in 400 error.

https://meta.discourse.org/t/following-a-direct-link-to-group-activity-results-in-400-error/81596

config/routes.rb

@@ -452,8 +452,6 @@ Discourse::Application.routes.draw do
     get "posts.rss" => "groups#posts_feed", format: :rss
     get "mentions.rss" => "groups#mentions_feed", format: :rss
 
-    get 'activity' => "groups#show"
-    get 'activity/:filter' => "groups#show"
     get 'members'
     get 'posts'
     get 'topics'
@@ -469,6 +467,8 @@ Discourse::Application.routes.draw do
     end
 
     member do
+      get 'activity' => "groups#show"
+      get 'activity/:filter' => "groups#show"
       put "members" => "groups#add_members"
       delete "members" => "groups#remove_member"
       post "request_membership" => "groups#request_membership"

spec/requests/groups_controller_spec.rb

@@ -73,6 +73,18 @@ describe GroupsController do
         property: 'og:description', content: group.bio_cooked
       })
     end
+
+    describe 'when viewing activity filters' do
+      it 'should return the right response' do
+        get "/groups/#{group.name}/activity/posts.json"
+
+        expect(response.status).to eq(200)
+
+        response_body = JSON.parse(response.body)['basic_group']
+
+        expect(response_body["id"]).to eq(group.id)
+      end
+    end
   end
 
   describe '#mentionable' do