added topic listing

cao_blogr/alembic/versions/20220501_de7d23a4b139.py

@@ -0,0 +1,32 @@
+"""init
+
+Revision ID: de7d23a4b139
+Revises: 85284752d1d5
+Create Date: 2022-05-01 08:41:03.244262
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = 'de7d23a4b139'
+down_revision = '85284752d1d5'
+branch_labels = None
+depends_on = None
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.add_column('tags', sa.Column('tag_name', sa.Unicode(length=25), nullable=False))
+    op.create_unique_constraint(op.f('uq_tags_tag_name'), 'tags', ['tag_name'])
+    op.add_column('topics', sa.Column('topic_name', sa.Unicode(length=25), nullable=False))
+    op.create_unique_constraint(op.f('uq_topics_topic_name'), 'topics', ['topic_name'])
+    # ### end Alembic commands ###
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_constraint(op.f('uq_topics_topic_name'), 'topics', type_='unique')
+    op.drop_column('topics', 'topic_name')
+    op.drop_constraint(op.f('uq_tags_tag_name'), 'tags', type_='unique')
+    op.drop_column('tags', 'tag_name')
+    # ### end Alembic commands ###