Create NestedMutableList/JSON Alembic Migration

A commented out portion was added for a simpler add/drop column style.
https://blog.miguelgrinberg.com/post/fixing-alter-table-errors-with-flask-migrate-and-sqlite

alembic/versions/b26551e73407_change_votes_to_nested_mutable_list_.py

@@ -0,0 +1,38 @@
+"""Change votes to nested mutable list (JSON backed)
+
+Revision ID: b26551e73407
+Revises: 43c1baca42a2
+Create Date: 2021-02-17 04:40:19.691104-06:00
+
+"""
+import sqlalchemy as sa
+from alembic import op
+# revision identifiers, used by Alembic.
+from sqlalchemy_json import NestedMutableList
+
+revision = 'b26551e73407'
+down_revision = '43c1baca42a2'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    pass
+    # ### end Alembic commands ###
+
+    with op.batch_alter_table('submission', schema=None) as batch_op:
+        batch_op.alter_column("votes", type_=NestedMutableList.as_mutable(sa.JSON))
+        # batch_op.drop_column('submission', 'votes')
+        # batch_op.add_column('submission', sa.Column('votes', NestedMutableList.as_mutable(sa.JSON)))
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    pass
+    # ### end Alembic commands ###
+
+    with op.batch_alter_table('submission', schema=None) as batch_op:
+        batch_op.alter_column("votes", type_=sa.Integer(), nullable=True)
+        # batch_op.drop_column('votes')
+        # batch_op.add_column('submission', sa.Column('votes', sa.Integer(), nullable=True))