FIX: Use Guardian.basic_user instead of new (anon) (#270)

c.f. de983796e1b66aa2ab039a4fb6e32cec8a65a098

There will soon be additional login_required checks
for Guardian, and the intent of many checks by automated
systems is better fulfilled by using BasicUser, which
simulates a logged in TL0 forum user, rather than an
anon user.

.discourse-compatibility

@@ -1,3 +1,4 @@
+< 3.2.0.beta4-dev: ad1b7c9608bf32c3a991580347302a071d5902d9
 < 3.2.0.beta2-dev: 9fbf43e2f077e86f0a1ff769af6036d4e78bfff1
 3.1.999: b5d487d6a5bfe2571d936eec5911d02a5f3fcc32
 3.1.0.beta1: 62fe282c756ac7de43a22a09b0d675882a507743

plugin.rb

@@ -703,8 +703,10 @@ class ::ListableTopicSerializer
     category_id_changes = topic_changes.diff["category_id"].to_a
     tag_changes = topic_changes.diff["tags"].to_a
 
-    old_allowed = Guardian.new.allow_accepted_answers?(category_id_changes[0], tag_changes[0])
-    new_allowed = Guardian.new.allow_accepted_answers?(category_id_changes[1], tag_changes[1])
+    old_allowed =
+      Guardian.basic_user.allow_accepted_answers?(category_id_changes[0], tag_changes[0])
+    new_allowed =
+      Guardian.basic_user.allow_accepted_answers?(category_id_changes[1], tag_changes[1])
 
     options[:refresh_stream] = true if old_allowed != new_allowed
   end

spec/models/site_spec.rb

@@ -5,7 +5,7 @@
 
 describe Site do
   let(:category) { Fabricate(:category) }
-  let(:guardian) { Guardian.new }
+  let(:guardian) { Guardian.basic_user }
 
   before { SiteSetting.show_filter_by_solved_status = true }
 

spec/serializers/topic_answer_mixin_spec.rb

@@ -5,7 +5,7 @@
 describe TopicAnswerMixin do
   let(:topic) { Fabricate(:topic) }
   let(:post) { Fabricate(:post, topic: topic) }
-  let(:guardian) { Guardian.new }
+  let(:guardian) { Guardian.basic_user }
 
   before do
     topic.custom_fields["accepted_answer_post_id"] = post.id

spec/serializers/user_card_serializer_spec.rb

@@ -4,7 +4,7 @@
 
 describe UserCardSerializer do
   let(:user) { Fabricate(:user) }
-  let(:serializer) { described_class.new(user, scope: Guardian.new, root: false) }
+  let(:serializer) { described_class.new(user, scope: Guardian.basic_user, root: false) }
   let(:json) { serializer.as_json }
 
   it "accepted_answers serializes number of accepted answers" do