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我有以下SQLAlchemy的模型：SQLAlchemy的枚舉遷移更新失敗的說法是不存在
class Cart(db.Model):
__tablename__ = 'carts'
#...
cart_status = db.Column(db.Enum('confirmed', 'canceled', name='cart_statuses'))
產生以下遷移腳本：
"""empty message
Revision ID: c7cbe7d1d686
Revises: 56e9612a77ee
Create Date: 2017-06-21 08:52:00.987769
"""
from alembic import op
import sqlalchemy as sa
# revision identifiers, used by Alembic.
revision = 'c7cbe7d1d686'
down_revision = '56e9612a77ee'
branch_labels = None
depends_on = None
def upgrade():
# ### commands auto generated by Alembic - please adjust! ###
op.add_column('carts', sa.Column('cart_status', sa.Enum('confirmed', 'canceled', name='cart_statuses'), nullable=True))
# ### end Alembic commands ###
def downgrade():
# ### commands auto generated by Alembic - please adjust! ###
op.drop_column('carts', 'cart_status')
# ### end Alembic commands ###
當我嘗試升級，我得到以下錯誤：
(ecom_bot) [email protected]:~/ecom/ecombot# python manage.py db upgrade
INFO [alembic.runtime.migration] Context impl PostgresqlImpl.
INFO [alembic.runtime.migration] Will assume transactional DDL.
INFO [alembic.runtime.migration] Running upgrade 56e9612a77ee -> c7cbe7d1d686, empty message
Traceback (most recent call last):
File "manage.py", line 37, in <module>
manager.run()
File "/root/ecom/ecom_bot/local/lib/python2.7/site-packages/flask_script/__init__.py", line 412, in run
result = self.handle(sys.argv[0], sys.argv[1:])
File "/root/ecom/ecom_bot/local/lib/python2.7/site-packages/flask_script/__init__.py", line 383, in handle
res = handle(*args, **config)
File "/root/ecom/ecom_bot/local/lib/python2.7/site-packages/flask_script/commands.py", line 216, in __call__
return self.run(*args, **kwargs)
File "/root/ecom/ecom_bot/local/lib/python2.7/site-packages/flask_migrate/__init__.py", line 247, in upgrade
command.upgrade(config, revision, sql=sql, tag=tag)
File "/root/ecom/ecom_bot/local/lib/python2.7/site-packages/alembic/command.py", line 254, in upgrade
script.run_env()
File "/root/ecom/ecom_bot/local/lib/python2.7/site-packages/alembic/script/base.py", line 421, in run_env
util.load_python_file(self.dir, 'env.py')
File "/root/ecom/ecom_bot/local/lib/python2.7/site-packages/alembic/util/pyfiles.py", line 93, in load_python_file
module = load_module_py(module_id, path)
File "/root/ecom/ecom_bot/local/lib/python2.7/site-packages/alembic/util/compat.py", line 75, in load_module_py
mod = imp.load_source(module_id, path, fp)
File "migrations/env.py", line 87, in <module>
run_migrations_online()
File "migrations/env.py", line 80, in run_migrations_online
context.run_migrations()
File "<string>", line 8, in run_migrations
File "/root/ecom/ecom_bot/local/lib/python2.7/site-packages/alembic/runtime/environment.py", line 817, in run_migrations
self.get_context().run_migrations(**kw)
File "/root/ecom/ecom_bot/local/lib/python2.7/site-packages/alembic/runtime/migration.py", line 329, in run_migrations
step.migration_fn(**kw)
File "/root/ecom/ecombot/migrations/versions/c7cbe7d1d686_.py", line 21, in upgrade
op.add_column('carts', sa.Column('cart_status', sa.Enum('confirmed', 'canceled', name='cart_statuses'), nullable=True))
File "<string>", line 8, in add_column
File "<string>", line 3, in add_column
File "/root/ecom/ecom_bot/local/lib/python2.7/site-packages/alembic/operations/ops.py", line 1551, in add_column
return operations.invoke(op)
File "/root/ecom/ecom_bot/local/lib/python2.7/site-packages/alembic/operations/base.py", line 318, in invoke
return fn(self, operation)
File "/root/ecom/ecom_bot/local/lib/python2.7/site-packages/alembic/operations/toimpl.py", line 123, in add_column
schema=schema
File "/root/ecom/ecom_bot/local/lib/python2.7/site-packages/alembic/ddl/impl.py", line 172, in add_column
self._exec(base.AddColumn(table_name, column, schema=schema))
File "/root/ecom/ecom_bot/local/lib/python2.7/site-packages/alembic/ddl/impl.py", line 118, in _exec
return conn.execute(construct, *multiparams, **params)
File "/root/ecom/ecom_bot/local/lib/python2.7/site-packages/sqlalchemy/engine/base.py", line 945, in execute
return meth(self, multiparams, params)
File "/root/ecom/ecom_bot/local/lib/python2.7/site-packages/sqlalchemy/sql/ddl.py", line 68, in _execute_on_connection
return connection._execute_ddl(self, multiparams, params)
File "/root/ecom/ecom_bot/local/lib/python2.7/site-packages/sqlalchemy/engine/base.py", line 1002, in _execute_ddl
compiled
File "/root/ecom/ecom_bot/local/lib/python2.7/site-packages/sqlalchemy/engine/base.py", line 1189, in _execute_context
context)
File "/root/ecom/ecom_bot/local/lib/python2.7/site-packages/sqlalchemy/engine/base.py", line 1402, in _handle_dbapi_exception
exc_info
File "/root/ecom/ecom_bot/local/lib/python2.7/site-packages/sqlalchemy/util/compat.py", line 203, in raise_from_cause
reraise(type(exception), exception, tb=exc_tb, cause=cause)
File "/root/ecom/ecom_bot/local/lib/python2.7/site-packages/sqlalchemy/engine/base.py", line 1182, in _execute_context
context)
File "/root/ecom/ecom_bot/local/lib/python2.7/site-packages/sqlalchemy/engine/default.py", line 470, in do_execute
cursor.execute(statement, parameters)
sqlalchemy.exc.ProgrammingError: (psycopg2.ProgrammingError) type "cart_statuses" does not exist
LINE 1: ALTER TABLE carts ADD COLUMN cart_status cart_statuses
^
[SQL: 'ALTER TABLE carts ADD COLUMN cart_status cart_statuses']