Feat/support parent child chunk (#12092)

api/core/rag/models/document.py

@@ -5,6 +5,19 @@ from typing import Any, Optional
 from pydantic import BaseModel, Field
 
 
+class ChildDocument(BaseModel):
+    """Class for storing a piece of text and associated metadata."""
+
+    page_content: str
+
+    vector: Optional[list[float]] = None
+
+    """Arbitrary metadata about the page content (e.g., source, relationships to other
+        documents, etc.).
+    """
+    metadata: Optional[dict] = Field(default_factory=dict)
+
+
 class Document(BaseModel):
     """Class for storing a piece of text and associated metadata."""
 
@@ -19,6 +32,8 @@ class Document(BaseModel):
 
     provider: Optional[str] = "dify"
 
+    children: Optional[list[ChildDocument]] = None
+
 
 class BaseDocumentTransformer(ABC):
     """Abstract base class for document transformation systems.