fix: Migration for changing gender type (fossasia#6117)

migrations/versions/43e8c59339af_.py

@@ -0,0 +1,25 @@
+"""Changing field type of gender from `Text` to `Select`
+
+Revision ID: 43e8c59337af
+Revises: b2aca7268345
+Create Date: 2019-06-27 20:31:58.92665
+
+"""
+
+from alembic import op
+import sqlalchemy as sa
+import sqlalchemy_utils
+
+
+ # revision identifiers, used by Alembic.
+revision = '43e8c59337af'
+down_revision = 'b2aca7268345'
+
+
+def upgrade():
+    op.execute("UPDATE custom_forms SET type = 'select' where field_identifier = 'gender' and form = 'attendee';", execution_options=None)
+
+
+
+def downgrade():
+    op.execute("UPDATE custom_forms SET type = 'text' where field_identifier = 'gender' and form = 'attendee';", execution_options=None)