models: add index on bucket_id

* adds alembic recipe
* closes zenodo/rdm-project#640

invenio_communities/alembic/72b37bb4119c_create_indeces_for_bucket_id.py

@@ -0,0 +1,42 @@
+#
+# This file is part of Invenio.
+# Copyright (C) 2023 CERN.
+#
+# Invenio is free software; you can redistribute it and/or modify it
+# under the terms of the MIT License; see LICENSE file for more details.
+
+"""Create indeces for bucket_id."""
+import sqlalchemy as sa
+from alembic import op
+
+# revision identifiers, used by Alembic.
+revision = "72b37bb4119c"
+down_revision = "5c68d45c80f0"
+branch_labels = ()
+depends_on = None
+
+
+def upgrade():
+    """Upgrade database."""
+    op.create_index(
+        op.f("ix_communities_metadata_bucket_id"),
+        "communities_metadata",
+        ["bucket_id"],
+        unique=False,
+    )
+    op.create_index(
+        op.f("ix_communities_files_object_version_id"),
+        "communities_files",
+        ["object_version_id"],
+        unique=False,
+    )
+
+
+def downgrade():
+    """Downgrade database."""
+    op.drop_index(
+        op.f("ix_communities_metadata_bucket_id"), table_name="communities_metadata"
+    )
+    op.drop_index(
+        op.f("ix_communities_files_object_version_id"), table_name="communities_files"
+    )

invenio_communities/communities/records/models.py

@@ -29,7 +29,7 @@ class CommunityMetadata(db.Model, RecordMetadataBase):
 
     slug = db.Column(String(255), unique=True, nullable=True)
 
-    bucket_id = db.Column(UUIDType, db.ForeignKey(Bucket.id))
+    bucket_id = db.Column(UUIDType, db.ForeignKey(Bucket.id), index=True)
     bucket = db.relationship(Bucket)
 
     # The deletion status is stored in the model so that we can use it in SQL queries