Enforces files on disk migration with SQLite.

tracim/migration/versions/69fb10c3d6f0_files_on_disk.py

@@ -1,4 +1,4 @@
-"""files on disk
+"""files on disk.
 
 Revision ID: 69fb10c3d6f0
 Revises: c1cea4bbae16
@@ -15,11 +15,24 @@ revision = '69fb10c3d6f0'
 down_revision = 'c1cea4bbae16'
 
 
+# INFO - A.P - 2017-07-20 - alembic batch migrations
+# http://alembic.zzzcomputing.com/en/latest/batch.html
+# This migration uses alembic batch mode, a workaround allowing to enforce
+# ALTER statement with SQLite while maintaining the traditional behavior of
+# the commented lines on other RDBMS.
+
+
 def upgrade():
-    op.add_column('content_revisions',
-                  sa.Column('depot_file',
-                            UploadedFileField))
+    """Adds the depot file in revision."""
+    # op.add_column('content_revisions',
+    #               sa.Column('depot_file',
+    #                         UploadedFileField))
+    with op.batch_alter_table('content_revisions') as batch_op:
+        batch_op.add_column(sa.Column('depot_file', UploadedFileField))
 
 
 def downgrade():
-    op.drop_column('content_revisions', 'depot_file')
+    """Drops the depot file in revision."""
+    # op.drop_column('content_revisions', 'depot_file')
+    with op.batch_alter_table('content_revisions') as batch_op:
+        batch_op.drop_column('depot_file')