sql migration

migrations/versions/2020_050218_f939d67374e4_.py

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+"""empty message
+
+Revision ID: f939d67374e4
+Revises: b4146f7d5277
+Create Date: 2020-05-02 18:07:42.275092
+
+"""
+import sqlalchemy_utils
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = 'f939d67374e4'
+down_revision = 'b4146f7d5277'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.add_column('referral', sa.Column('name', sa.String(length=512), nullable=True))
+    op.drop_constraint('users_referral_id_fkey', 'users', type_='foreignkey')
+    op.create_foreign_key(None, 'users', 'referral', ['referral_id'], ['id'], ondelete='SET NULL')
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_constraint(None, 'users', type_='foreignkey')
+    op.create_foreign_key('users_referral_id_fkey', 'users', 'referral', ['referral_id'], ['id'])
+    op.drop_column('referral', 'name')
+    # ### end Alembic commands ###