fix(jina): respect a falsy score_threshold override in JinaRanker (#4084)

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
Co-authored-by: bogdankostic <bogdankostic@web.de>

Author: 3 people

integrations/jina/src/haystack_integrations/components/rankers/jina/ranker.py

@@ -119,7 +119,7 @@ def _prepare_request_data(
             raise ValueError(msg)
 
         top_k = top_k or self.top_k
-        score_threshold = score_threshold or self.score_threshold
+        score_threshold = score_threshold if score_threshold is not None else self.score_threshold
 
         data = {
             "query": query,

integrations/jina/tests/test_ranker.py

@@ -233,6 +233,25 @@ def test_run_with_score_threshold_filters_results(self):
         assert len(ranked) == 2
         assert all(doc.score >= 2.5 for doc in ranked)
 
+    def test_run_score_threshold_zero_overrides_init(self):
+        docs = [Document(content=f"doc {i}") for i in range(4)]
+
+        with patch("httpx.Client.post", side_effect=mock_httpx_post_response):
+            ranker = JinaRanker(api_key=Secret.from_token("fake-api-key"), score_threshold=2.5)
+            result = ranker.run(query="q", documents=docs, score_threshold=0.0)
+
+        assert len(result["documents"]) == 4
+
+    @pytest.mark.asyncio
+    async def test_run_async_score_threshold_zero_overrides_init(self):
+        docs = [Document(content=f"doc {i}") for i in range(4)]
+
+        with patch("httpx.AsyncClient.post", side_effect=mock_httpx_post_response):
+            ranker = JinaRanker(api_key=Secret.from_token("fake-api-key"), score_threshold=2.5)
+            result = await ranker.run_async(query="q", documents=docs, score_threshold=0.0)
+
+        assert len(result["documents"]) == 4
+
     def test_run_with_top_k_truncates_results(self):
         docs = [Document(content=f"doc {i}") for i in range(5)]