Alembic SqlAlchemy Postgres «NameError: имя« String »не определено», пытаясь добавить поля Array (String)

Модель ниже приведенного ниже сообщения об ошибке.

Я пытаюсь создать несколько столбцов массива, используя Alembic, но получение NameError: имя 'String' не определено.

Любая помощь ценится.

благодаря!

from sqlalchemy import Column, String, Integer, DateTime from serve_spec.db_global import db import datetime from time import time from sqlalchemy.dialects.postgresql import JSON from sqlalchemy.dialects.postgresql import ARRAY class Issues(db.Base): __tablename__ = 'issues' id = Column(String, primary_key=True) thread_id = Column(String, nullable=False) created = Column(DateTime(timezone=False), nullable=False, default=datetime.datetime.utcnow) created_timestamp = Column(Integer, nullable=False, default=time) created_by_user_name = Column(String, nullable=False) is_parent = Column(Integer, nullable=False) parent_title = Column(String) subscribed = Column(ARRAY(String)) unsubscribed = Column(ARRAY(String)) pending_notifications_web = Column(ARRAY(String)) pending_notifications_email = Column(ARRAY(String)) markdown_text = Column(String, nullable=False, ) kernel_id = Column(String, nullable=False) state = Column(String, nullable=False, default='open') labels = Column(JSON()) 

Вот вывод с ошибкой внизу:

 (venv3.4.2) ubuntu@ip-172-31-8-128:/var/www/www.example.org/src/crowdwave$ PYTHONPATH=. alembic upgrade head INFO [alembic.runtime.migration] Context impl PostgresqlImpl. INFO [alembic.runtime.migration] Will assume transactional DDL. INFO [alembic.runtime.migration] Running upgrade d9bc97e175aa -> dd9e391f807f, Issues is behind Traceback (most recent call last): File "/var/www/www.example.org/venv3.4.2/bin/alembic", line 9, in <module> load_entry_point('alembic==0.8.5', 'console_scripts', 'alembic')() File "/var/www/www.example.org/venv3.4.2/lib/python3.4/site-packages/alembic/config.py", line 479, in main CommandLine(prog=prog).main(argv=argv) File "/var/www/www.example.org/venv3.4.2/lib/python3.4/site-packages/alembic/config.py", line 473, in main self.run_cmd(cfg, options) File "/var/www/www.example.org/venv3.4.2/lib/python3.4/site-packages/alembic/config.py", line 456, in run_cmd **dict((k, getattr(options, k)) for k in kwarg) File "/var/www/www.example.org/venv3.4.2/lib/python3.4/site-packages/alembic/command.py", line 174, in upgrade script.run_env() File "/var/www/www.example.org/venv3.4.2/lib/python3.4/site-packages/alembic/script/base.py", line 397, in run_env util.load_python_file(self.dir, 'env.py') File "/var/www/www.example.org/venv3.4.2/lib/python3.4/site-packages/alembic/util/pyfiles.py", line 81, in load_python_file module = load_module_py(module_id, path) File "/var/www/www.example.org/venv3.4.2/lib/python3.4/site-packages/alembic/util/compat.py", line 68, in load_module_py module_id, path).load_module(module_id) File "<frozen importlib._bootstrap>", line 539, in _check_name_wrapper File "<frozen importlib._bootstrap>", line 1614, in load_module File "<frozen importlib._bootstrap>", line 596, in _load_module_shim File "<frozen importlib._bootstrap>", line 1220, in load File "<frozen importlib._bootstrap>", line 1200, in _load_unlocked File "<frozen importlib._bootstrap>", line 1129, in _exec File "<frozen importlib._bootstrap>", line 1471, in exec_module File "<frozen importlib._bootstrap>", line 321, in _call_with_frames_removed File "alembic/env.py", line 82, in <module> run_migrations_online() File "alembic/env.py", line 77, in run_migrations_online context.run_migrations() File "<string>", line 8, in run_migrations File "/var/www/www.example.org/venv3.4.2/lib/python3.4/site-packages/alembic/runtime/environment.py", line 797, in run_migrations self.get_context().run_migrations(**kw) File "/var/www/www.example.org/venv3.4.2/lib/python3.4/site-packages/alembic/runtime/migration.py", line 312, in run_migrations step.migration_fn(**kw) File "/var/www/www.example.org/src/crowdwave/alembic/versions/dd9e391f807f_issues_is_behind.py", line 21, in upgrade op.add_column('issues', sa.Column('pending_notifications_email', postgresql.ARRAY(String()), nullable=True)) NameError: name 'String' is not defined (venv3.4.2) ubuntu@ip-172-31-8-128:/var/www/www.example.org/src/crowdwave$ 

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  postgresql.ARRAY(String(), nullable=True)) 

  postgresql.ARRAY(sa.String(), nullable=True))