"""add features to product

Revision ID: abcd1237_add_features_to_product
Revises: 63d5e2868229
Create Date: 2025-12-07 21:30:00.000000

"""
from alembic import op
import sqlalchemy as sa
from sqlalchemy.engine import reflection


# revision identifiers, used by Alembic.
revision = 'abcd1237_add_features_to_product'
down_revision = '63d5e2868229'
branch_labels = None
depends_on = None


def upgrade():
    # ### commands auto generated by Alembic - please adjust! ###
    # 检查列是否已存在
    bind = op.get_bind()
    inspector = reflection.Inspector.from_engine(bind)
    columns = inspector.get_columns('product')
    column_names = [column['name'] for column in columns]
    
    # 只有当列不存在时才添加
    if 'features' not in column_names:
        with op.batch_alter_table('product', schema=None) as batch_op:
            batch_op.add_column(sa.Column('features', sa.Text(), nullable=True, comment='产品功能特性'))

    # ### end Alembic commands ###


def downgrade():
    # ### commands auto generated by Alembic - please adjust! ###
    with op.batch_alter_table('product', schema=None) as batch_op:
        batch_op.drop_column('features')

    # ### end Alembic commands ###