FIX: Check if user has existing solution despite trust_level=any for first accepted solution validator used in automation (#377)

There exists a bug in the following trigger (see screenshot) where if the user has an existing solution already, they will still pass validation for "first accepted solution" due to the trust level being "any".

lib/discourse_solved/first_accepted_post_solution_validator.rb

@@ -5,15 +5,15 @@ module DiscourseSolved
     def self.check(post, trust_level:)
       return false if post.archetype != Archetype.default
       return false if !post&.user&.human?
-      return true if trust_level == "any"
 
-      return false if TrustLevel.compare(post&.user&.trust_level, trust_level.to_i)
-
-      if !UserAction.where(user_id: post&.user_id, action_type: UserAction::SOLVED).exists?
-        return true
+      if trust_level != "any" && TrustLevel.compare(post&.user&.trust_level, trust_level.to_i)
+        return false
       end
 
-      false
+      !DiscourseSolved::SolvedTopic
+        .joins(:answer_post)
+        .where("posts.user_id = ?", post.user_id)
+        .exists?
     end
   end
 end

spec/lib/first_accepted_post_solution_validator_spec.rb

@@ -1,7 +1,5 @@
 # frozen_string_literal: true
 
-require "rails_helper"
-
 describe DiscourseSolved::FirstAcceptedPostSolutionValidator do
   fab!(:user_tl1) { Fabricate(:user, trust_level: TrustLevel[1], refresh_auto_groups: true) }
 
@@ -52,6 +50,13 @@ describe DiscourseSolved::FirstAcceptedPostSolutionValidator do
       post_1 = create_post(user: user_tl1)
       expect(described_class.check(post_1, trust_level: "any")).to eq(true)
     end
+
+    it "invalidates if post user already has an accepted post" do
+      accepted_post = create_post(user: user_tl1)
+      DiscourseSolved.accept_answer!(accepted_post, Discourse.system_user)
+      post_1 = create_post(user: user_tl1)
+      expect(described_class.check(post_1, trust_level: "any")).to eq(false)
+    end
   end
 
   context "when user is system" do