fix: do not dump pipeline graph into the debug payload (#6528)

haystack/core/pipeline/draw/draw.py

@@ -45,14 +45,6 @@ def _draw(
     logger.debug("Pipeline diagram saved at %s", path)
 
 
-def _convert_for_debug(graph: networkx.MultiDiGraph) -> Any:
-    """
-    Renders the pipeline graph with additional debug information into a text file that Mermaid can later render.
-    """
-    graph = _prepare_for_drawing(graph=graph, style_map={})
-    return _to_mermaid_text(graph=graph)
-
-
 def _convert(
     graph: networkx.MultiDiGraph, engine: RenderingEngines = "mermaid-image", style_map: Optional[Dict[str, str]] = None
 ) -> Any:

haystack/core/pipeline/pipeline.py

@@ -23,7 +23,7 @@
     PipelineValidationError,
 )
 from haystack.core.pipeline.descriptions import find_pipeline_outputs
-from haystack.core.pipeline.draw.draw import _draw, _convert_for_debug, RenderingEngines
+from haystack.core.pipeline.draw.draw import _draw, RenderingEngines
 from haystack.core.pipeline.validation import validate_pipeline_input, find_pipeline_inputs
 from haystack.core.component.connection import Connection, parse_connect_string
 from haystack.core.type_utils import _type_name
@@ -519,14 +519,12 @@ def _record_pipeline_step(
         """
         Stores a snapshot of this step into the self.debug dictionary of the pipeline.
         """
-        mermaid_graph = _convert_for_debug(deepcopy(self.graph))
         self._debug[step] = {
             "time": datetime.datetime.now(),
             "components_queue": components_queue,
             "mandatory_values_buffer": mandatory_values_buffer,
             "optional_values_buffer": optional_values_buffer,
             "pipeline_output": pipeline_output,
-            "diagram": mermaid_graph,
         }
 
     def _clear_visits_count(self):

releasenotes/notes/remove-image-from-debug-c83d61db92bcbfc2.yaml

@@ -0,0 +1,5 @@
+---
+issues:
+  - |
+    Fix "TypeError: descriptor '__dict__' for 'XXX' objects doesn't apply to a 'XXX' object" when running
+    pipelines with `debug=True` by removing the graph image from the debug payload.