Load message history to core chat from schema chat (#429)

Co-authored-by: Philip Meier <[email protected]>

ragna/deploy/_api/core.py

@@ -242,11 +242,7 @@ def schema_to_core_chat(
             chat_name=chat.metadata.name,
             **chat.metadata.params,
         )
-        # FIXME: We need to reconstruct the previous messages here. Right now this is
-        #  not needed, because the chat itself never accesses past messages. However,
-        #  if we implement a chat history feature, i.e. passing past messages to
-        #  the assistant, this becomes crucial.
-        core_chat._messages = []
+        core_chat._messages = [message.to_core() for message in chat.messages]
         core_chat._prepared = chat.prepared
 
         return core_chat

ragna/deploy/_api/schemas.py

@@ -26,6 +26,16 @@ def from_core(cls, document: ragna.core.Document) -> Document:
             name=document.name,
         )
 
+    def to_core(self) -> ragna.core.Document:
+        return ragna.core.LocalDocument(
+            id=self.id,
+            name=self.name,
+            # TEMP: setting an empty metadata dict for now.
+            # Will be resolved as part of the "managed ragna" work:
+            # https://github.com/Quansight/ragna/issues/256
+            metadata={},
+        )
+
 
 class DocumentUpload(BaseModel):
     parameters: ragna.core.DocumentUploadParameters
@@ -50,6 +60,15 @@ def from_core(cls, source: ragna.core.Source) -> Source:
             num_tokens=source.num_tokens,
         )
 
+    def to_core(self) -> ragna.core.Source:
+        return ragna.core.Source(
+            id=self.id,
+            document=self.document.to_core(),
+            location=self.location,
+            content=self.content,
+            num_tokens=self.num_tokens,
+        )
+
 
 class Message(BaseModel):
     id: uuid.UUID = Field(default_factory=uuid.uuid4)
@@ -66,6 +85,13 @@ def from_core(cls, message: ragna.core.Message) -> Message:
             sources=[Source.from_core(source) for source in message.sources],
         )
 
+    def to_core(self) -> ragna.core.Message:
+        return ragna.core.Message(
+            content=self.content,
+            role=self.role,
+            sources=[source.to_core() for source in self.sources],
+        )
+
 
 class ChatMetadata(BaseModel):
     name: str