Remove __eq__ and __hash__ from PromptNode (#3923)

haystack/nodes/prompt/prompt_node.py

@@ -877,16 +877,6 @@ class PromptNode(BaseComponent):
 
         return list(self.prompt_templates[prompt_template].prompt_params)
 
-    def __eq__(self, other):
-        if isinstance(other, PromptNode):
-            if self.default_prompt_template != other.default_prompt_template:
-                return False
-            return self.model_name_or_path == other.model_name_or_path
-        return False
-
-    def __hash__(self):
-        return hash((self.default_prompt_template, self.model_name_or_path))
-
     def run(
         self,
         query: Optional[str] = None,

test/nodes/test_prompt_node.py

@@ -645,3 +645,41 @@ def test_complex_pipeline_with_all_features(tmp_path):
     assert len(result["invocation_context"]) > 0
     assert len(result["questions"]) > 0
     assert "questions" in result["invocation_context"] and len(result["invocation_context"]["questions"]) > 0
+
+
+def test_complex_pipeline_with_multiple_same_prompt_node_components_yaml(tmp_path):
+    # p2 and p3 are essentially the same PromptNode component, make sure we can use them both as is in the pipeline
+    with open(tmp_path / "tmp_config.yml", "w") as tmp_file:
+        tmp_file.write(
+            f"""
+            version: ignore
+            components:
+            - name: p1
+              params:
+                default_prompt_template: question-generation
+                output_variable: questions
+              type: PromptNode
+            - name: p2
+              params:
+                default_prompt_template: question-answering
+              type: PromptNode
+            - name: p3
+              params:
+                default_prompt_template: question-answering
+              type: PromptNode
+            pipelines:
+            - name: query
+              nodes:
+              - name: p1
+                inputs:
+                - Query
+              - name: p2
+                inputs:
+                - p1
+              - name: p3
+                inputs:
+                - p2
+        """
+        )
+    pipeline = Pipeline.load_from_yaml(path=tmp_path / "tmp_config.yml")
+    assert pipeline is not None