core[patch]: Change structured prompt lc id to match js (#19099)

libs/core/langchain_core/load/mapping.py

@@ -481,6 +481,12 @@ SERIALIZABLE_MAPPING: Dict[Tuple[str, ...], Tuple[str, ...]] = {
         "retry",
         "RunnableRetry",
     ),
+    ("langchain_core", "prompts", "structured", "StructuredPrompt"): (
+        "langchain_core",
+        "prompts",
+        "structured",
+        "StructuredPrompt",
+    ),
 }
 
 # Needed for backwards compatibility for old versions of LangChain where things
@@ -522,12 +528,6 @@ _OG_SERIALIZABLE_MAPPING: Dict[Tuple[str, ...], Tuple[str, ...]] = {
         "image",
         "ImagePromptTemplate",
     ),
-    ("langchain", "prompts", "chat", "StructuredPrompt"): (
-        "langchain_core",
-        "prompts",
-        "structured",
-        "StructuredPrompt",
-    ),
 }
 
 # Needed for backwards compatibility for a few versions where we serialized

libs/core/langchain_core/prompts/structured.py

@@ -3,6 +3,7 @@ from typing import (
     Callable,
     Dict,
     Iterator,
+    List,
     Mapping,
     Optional,
     Sequence,
@@ -34,6 +35,15 @@ from langchain_core.runnables.base import (
 class StructuredPrompt(ChatPromptTemplate):
     schema_: Union[Dict, Type[BaseModel]]
 
+    @classmethod
+    def get_lc_namespace(cls) -> List[str]:
+        """Get the namespace of the langchain object.
+
+        For example, if the class is `langchain.llms.openai.OpenAI`, then the
+        namespace is ["langchain", "llms", "openai"]
+        """
+        return cls.__module__.split(".")
+
     @classmethod
     def from_messages_and_schema(
         cls,

libs/langchain/tests/unit_tests/load/test_serializable.py

@@ -40,16 +40,23 @@ def import_all_modules(package_name: str) -> dict:
 
 
 def test_serializable_mapping() -> None:
-    # This should have had a different namespace, as it was never
-    # exported from the langchain module, but we keep for whoever has
-    # already serialized it.
     to_skip = {
+        # This should have had a different namespace, as it was never
+        # exported from the langchain module, but we keep for whoever has
+        # already serialized it.
         ("langchain", "prompts", "image", "ImagePromptTemplate"): (
             "langchain_core",
             "prompts",
             "image",
             "ImagePromptTemplate",
         ),
+        # This is not exported from langchain, only langchain_core
+        ("langchain_core", "prompts", "structured", "StructuredPrompt"): (
+            "langchain_core",
+            "prompts",
+            "structured",
+            "StructuredPrompt",
+        ),
     }
     serializable_modules = import_all_modules("langchain")
     missing = set(SERIALIZABLE_MAPPING).difference(