docarray
diff --git a/‎docarray/index/backends/qdrant.py‎
Lines changed: 11 additions & 5 deletions b/‎docarray/index/backends/qdrant.py‎
Lines changed: 11 additions & 5 deletions
diff --git a/‎tests/index/qdrant/test_subindex.py‎
Lines changed: 33 additions & 0 deletions b/‎tests/index/qdrant/test_subindex.py‎
Lines changed: 33 additions & 0 deletions
@@ -67,6 +67,10 @@ class QdrantDocumentIndex(BaseDocIndex, Generic[TSchema]):
 
     def __init__(self, db_config=None, **kwargs):
         """Initialize QdrantDocumentIndex"""
+        if db_config is not None and getattr(
+            db_config, 'index_name'
+        ):  # this is needed for subindices
+            db_config.collection_name = db_config.index_name
         super().__init__(db_config=db_config, **kwargs)
         self._db_config: QdrantDocumentIndex.DBConfig = cast(
             QdrantDocumentIndex.DBConfig, self._db_config
@@ -98,11 +102,7 @@ def collection_name(self):
                 'To do so, use the syntax: QdrantDocumentIndex[DocumentType]'
             )
 
-        return (
-            self._db_config.collection_name
-            or self._db_config.index_name
-            or default_collection_name
-        )
+        return self._db_config.collection_name or default_collection_name
 
     @property
     def index_name(self):
@@ -250,6 +250,12 @@ class DBConfig(BaseDocIndex.DBConfig):
             }
         )
 
+        def __post_init__(self):
+            if self.collection_name is None and self.index_name is not None:
+                self.collection_name = self.index_name
+            if self.index_name is None and self.collection_name is not None:
+                self.index_name = self.collection_name
+
     @dataclass
     class RuntimeConfig(BaseDocIndex.RuntimeConfig):
         """Dataclass that contains all "dynamic" configurations of QdrantDocumentIndex."""
 
@@ -222,3 +222,36 @@ def test_subindex_contain(index):
     # Empty index
     empty_index = QdrantDocumentIndex[MyDoc]()
     assert (empty_doc in empty_index) is False
+
+
+def test_subindex_collections():
+    from typing import Optional
+    from docarray.typing.tensor import AnyTensor
+    from pydantic import Field
+
+    class MetaPathDoc(BaseDoc):
+        path_id: str
+        level: int
+        text: str
+        embedding: Optional[AnyTensor] = Field(space='cosine', dim=128)
+
+    class MetaCategoryDoc(BaseDoc):
+        node_id: Optional[str]
+        node_name: Optional[str]
+        name: Optional[str]
+        product_type_definitions: Optional[str]
+        leaf: bool
+        paths: Optional[DocList[MetaPathDoc]]
+        embedding: Optional[AnyTensor] = Field(space='cosine', dim=128)
+        channel: str
+        lang: str
+
+    db_config = QdrantDocumentIndex.DBConfig(
+        host='localhost',
+        collection_name="channel_category",
+    )
+
+    doc_index = QdrantDocumentIndex[MetaCategoryDoc](db_config)
+
+    assert doc_index._subindices["paths"].index_name == 'channel_category__paths'
+    assert doc_index._subindices["paths"].collection_name == 'channel_category__paths'