FIX: Basic cleanup of AI Caption to remove line breaks and pipes (#857)

lib/ai_helper/assistant.rb

@@ -156,12 +156,15 @@ module DiscourseAi
             ],
           )
 
+        raw_caption =
           DiscourseAi::Completions::Llm.proxy(SiteSetting.ai_helper_image_caption_model).generate(
             prompt,
             user: user,
             max_tokens: 1024,
             feature_name: "image_caption",
           )
+
+        raw_caption.delete("|").squish
       end
 
       private

spec/requests/ai_helper/assistant_controller_spec.rb

@@ -128,10 +128,11 @@ RSpec.describe DiscourseAi::AiHelper::AssistantController do
     let(:caption_with_attrs) do
       "A picture of a cat sitting on a table (#{I18n.t("discourse_ai.ai_helper.image_caption.attribution")})"
     end
+    let(:bad_caption) { "A picture of a cat \nsitting on a |table|" }
 
     before { assign_fake_provider_to(:ai_helper_image_caption_model) }
 
-    def request_caption(params)
+    def request_caption(params, caption = "A picture of a cat sitting on a table")
       DiscourseAi::Completions::Llm.with_prepared_responses([caption]) do
         post "/discourse-ai/ai-helper/caption_image", params: params
 
@@ -155,6 +156,13 @@ RSpec.describe DiscourseAi::AiHelper::AssistantController do
         end
       end
 
+      it "returns a cleaned up caption from the LLM" do
+        request_caption({ image_url: image_url, image_url_type: "long_url" }, bad_caption) do |r|
+          expect(r.status).to eq(200)
+          expect(r.parsed_body["caption"]).to eq(caption_with_attrs)
+        end
+      end
+
       context "when the image_url is a short_url" do
         let(:image_url) { upload.short_url }