Flask 属性错误：'；int'；对象没有属性'_编译器调度&x27；

我正在使用

flask-sqlalchemy

扩展和

alembic

进行迁移。当我尝试添加新的迁移文件并将架构升级到最新版本时，出现以下错误：

AttributeError: 'int' object has no attribute '_compiler_dispatch'

迁移文件的内容：

revision = 'ec2c2d40eb1'
down_revision = '28dda873b826'

from alembic import op
import sqlalchemy as sa


def upgrade():
    op.alter_column(
        'users',
        'wiki_permission',
        new_column_name='wiki_group',
        nullable=False,
        existing_nullable=False,
        type_=sa.Integer(),
        existing_type=sa.Integer(),
        server_default=1,
        existing_server_default=1          # Line of error - 27
    )   


def downgrade():
    op.alter_column(
        'users',
        'wiki_group',
        new_column_name='wiki_permission',
        nullable=False,
        existing_nullable=False,
        type_=sa.Integer(),
        existing_type=sa.Integer(),
        server_default=1,
        existing_server_default=1
    )

谢谢你抽出时间来帮助我

编辑：

完整的错误消息：

INFO  [alembic.migration] Context impl MySQLImpl.
INFO  [alembic.migration] Will assume non-transactional DDL.
INFO  [alembic.migration] Running upgrade 28dda873b826 -> ec2c2d40eb1, users change column wiki_permission to wiki_group
Traceback (most recent call last):
  File "/home/kevin/Code/python/flask/terminus/venv/bin/alembic", line 9, in <module>
    load_entry_point('alembic==0.6.5', 'console_scripts', 'alembic')()
  File "/home/kevin/Code/python/flask/terminus/venv/local/lib/python2.7/site-packages/alembic/config.py", line 298, in main
    CommandLine(prog=prog).main(argv=argv)
  File "/home/kevin/Code/python/flask/terminus/venv/local/lib/python2.7/site-packages/alembic/config.py", line 293, in main
    self.run_cmd(cfg, options)
  File "/home/kevin/Code/python/flask/terminus/venv/local/lib/python2.7/site-packages/alembic/config.py", line 279, in run_cmd
    **dict((k, getattr(options, k)) for k in kwarg)
  File "/home/kevin/Code/python/flask/terminus/venv/local/lib/python2.7/site-packages/alembic/command.py", line 125, in upgrade
    script.run_env()
  File "/home/kevin/Code/python/flask/terminus/venv/local/lib/python2.7/site-packages/alembic/script.py", line 203, in run_env
    util.load_python_file(self.dir, 'env.py')
  File "/home/kevin/Code/python/flask/terminus/venv/local/lib/python2.7/site-packages/alembic/util.py", line 212, in load_python_file
    module = load_module_py(module_id, path)
  File "/home/kevin/Code/python/flask/terminus/venv/local/lib/python2.7/site-packages/alembic/compat.py", line 58, in load_module_py
    mod = imp.load_source(module_id, path, fp)
  File "alembic/env.py", line 77, in <module>
    run_migrations_online()
  File "alembic/env.py", line 70, in run_migrations_online
    context.run_migrations()
  File "<string>", line 7, in run_migrations
  File "/home/kevin/Code/python/flask/terminus/venv/local/lib/python2.7/site-packages/alembic/environment.py", line 688, in run_migrations
    self.get_context().run_migrations(**kw)
  File "/home/kevin/Code/python/flask/terminus/venv/local/lib/python2.7/site-packages/alembic/migration.py", line 258, in run_migrations
    change(**kw)
  File "alembic/versions/ec2c2d40eb1_users_change_column_wiki_permission_to_.py", line 27, in upgrade
    existing_server_default=1,
  File "<string>", line 7, in alter_column
  File "<string>", line 1, in <lambda>
  File "/home/kevin/Code/python/flask/terminus/venv/local/lib/python2.7/site-packages/alembic/util.py", line 329, in go
    return fn(*arg, **kw)
  File "/home/kevin/Code/python/flask/terminus/venv/local/lib/python2.7/site-packages/alembic/operations.py", line 317, in alter_column
    existing_autoincrement=existing_autoincrement
  File "/home/kevin/Code/python/flask/terminus/venv/local/lib/python2.7/site-packages/alembic/ddl/mysql.py", line 44, in alter_column
    else existing_autoincrement
  File "/home/kevin/Code/python/flask/terminus/venv/local/lib/python2.7/site-packages/alembic/ddl/impl.py", line 76, in _exec
    conn.execute(construct, *multiparams, **params)
  File "/home/kevin/Code/python/flask/terminus/venv/local/lib/python2.7/site-packages/sqlalchemy/engine/base.py", line 720, in execute
    return meth(self, multiparams, params)
  File "/home/kevin/Code/python/flask/terminus/venv/local/lib/python2.7/site-packages/sqlalchemy/sql/ddl.py", line 67, in _execute_on_connection
    return connection._execute_ddl(self, multiparams, params)
  File "/home/kevin/Code/python/flask/terminus/venv/local/lib/python2.7/site-packages/sqlalchemy/engine/base.py", line 768, in _execute_ddl
    compiled = ddl.compile(dialect=dialect)
  File "<string>", line 1, in <lambda>
  File "/home/kevin/Code/python/flask/terminus/venv/local/lib/python2.7/site-packages/sqlalchemy/sql/elements.py", line 468, in compile
    return self._compiler(dialect, bind=bind, **kw)
  File "/home/kevin/Code/python/flask/terminus/venv/local/lib/python2.7/site-packages/sqlalchemy/sql/ddl.py", line 25, in _compiler
    return dialect.ddl_compiler(dialect, self, **kw)
  File "/home/kevin/Code/python/flask/terminus/venv/local/lib/python2.7/site-packages/sqlalchemy/sql/compiler.py", line 197, in __init__
    self.string = self.process(self.statement, **compile_kwargs)
  File "/home/kevin/Code/python/flask/terminus/venv/local/lib/python2.7/site-packages/sqlalchemy/sql/compiler.py", line 220, in process
    return obj._compiler_dispatch(self, **kwargs)
  File "/home/kevin/Code/python/flask/terminus/venv/local/lib/python2.7/site-packages/sqlalchemy/ext/compiler.py", line 410, in <lambda>
    lambda *arg, **kw: existing(*arg, **kw))
  File "/home/kevin/Code/python/flask/terminus/venv/local/lib/python2.7/site-packages/sqlalchemy/ext/compiler.py", line 448, in __call__
    return fn(element, compiler, **kw)
  File "/home/kevin/Code/python/flask/terminus/venv/local/lib/python2.7/site-packages/alembic/ddl/mysql.py", line 171, in _mysql_change_column
    autoincrement=element.autoincrement
  File "/home/kevin/Code/python/flask/terminus/venv/local/lib/python2.7/site-packages/alembic/ddl/mysql.py", line 190, in _mysql_colspec
    spec += " DEFAULT %s" % _render_value(compiler, server_default)
  File "/home/kevin/Code/python/flask/terminus/venv/local/lib/python2.7/site-packages/alembic/ddl/mysql.py", line 179, in _render_value
    return compiler.sql_compiler.process(expr)
  File "/home/kevin/Code/python/flask/terminus/venv/local/lib/python2.7/site-packages/sqlalchemy/sql/compiler.py", line 220, in process
    return obj._compiler_dispatch(self, **kwargs)
AttributeError: 'int' object has no attribute '_compiler_dispatch'

INFO[alembic.migration]Context impl MySQLImpl。
INFO[alembic.migration]将采用非事务性DDL。
信息[alembic.migration]运行升级28dda873b826->ec2c2d40eb1，用户将列wiki\权限更改为wiki\组
回溯（最近一次呼叫最后一次）：
文件“/home/kevin/Code/python/flask/terminus/venv/bin/alembic”，第9行，in
加载入口点（“alembic==0.6.5”，“控制台脚本”，“alembic”）（）
文件“/home/kevin/Code/python/flask/terminus/venv/local/lib/python2.7/site packages/alembic/config.py”，第298行，在main中
命令行（prog=prog）.main（argv=argv）
文件“/home/kevin/Code/python/flask/terminus/venv/local/lib/python2.7/site packages/alembic/config.py”，第293行，在main中
self.run_cmd（cfg，选项）
文件“/home/kevin/Code/python/flask/terminus/venv/local/lib/python2.7/site packages/alembic/config.py”，第279行，在run_cmd中
**kwarg中k的dict（（k，getattr（options，k）））
文件“/home/kevin/Code/python/flask/terminus/venv/local/lib/python2.7/site packages/alembic/command.py”，第125行，在升级中
script.run_env（）
文件“/home/kevin/Code/python/flask/terminus/venv/local/lib/python2.7/site packages/alembic/script.py”，第203行，运行环境
加载python文件（self.dir，'env.py'）
文件“/home/kevin/Code/python/flask/terminus/venv/local/lib/python2.7/site packages/alembic/util.py”，第212行，在load\u python\u文件中
模块=加载模块（模块id，路径）
文件“/home/kevin/Code/python/flask/terminus/venv/local/lib/python2.7/site packages/alembic/compat.py”，第58行，加载模块
mod=imp.load\u源（模块id、路径、fp）
文件“alembic/env.py”，第77行，在
运行_迁移_联机（）
文件“alembic/env.py”，第70行，在线运行迁移
context.run_migrations（）
运行迁移中第7行的文件“”
文件“/home/kevin/Code/python/flask/terminus/venv/local/lib/python2.7/site packages/alembic/environment.py”，第688行，运行迁移中
self.get_context（）.运行_迁移（**kw）
文件“/home/kevin/Code/python/flask/terminus/venv/local/lib/python2.7/site packages/alembic/migration.py”，第258行，运行迁移中
变化（**千瓦）
文件“alembic/versions/ec2c2d40eb1\u用户\u更改\u列\u wiki\u权限\u改为\uuu.py”，第27行，在升级中
现有\u服务器\u默认值=1，
文件“”，第7行，在alter_列中
文件“”，第1行，在
文件“/home/kevin/Code/python/flask/terminus/venv/local/lib/python2.7/site packages/alembic/util.py”，go中第329行
返回fn（*arg，**kw）
文件“/home/kevin/Code/python/flask/terminus/venv/local/lib/python2.7/site packages/alembic/operations.py”，第317行，在alter_列中
现有自动增量=现有自动增量
文件“/home/kevin/Code/python/flask/terminus/venv/local/lib/python2.7/site packages/alembic/ddl/mysql.py”，第44行，在alter_列中
else现有_自动增量
文件“/home/kevin/Code/python/flask/terminus/venv/local/lib/python2.7/site packages/alembic/ddl/impl.py”，第76行，in_exec
conn.execute（构造、*多内存、**参数）
文件“/home/kevin/Code/python/flask/terminus/venv/local/lib/python2.7/site packages/sqlalchemy/engine/base.py”，第720行，在execute中
返回方法（自身、多线程、参数）
文件“/home/kevin/Code/python/flask/terminus/venv/local/lib/python2.7/site packages/sqlalchemy/sql/ddl.py”，第67行，在连接中执行
返回连接。_执行_ddl（self、multiparams、params）
文件“/home/kevin/Code/python/flask/terminus/venv/local/lib/python2.7/site packages/sqlalchemy/engine/base.py”，第768行，在_execute_ddl中
compiled=ddl.compile（方言=方言）
文件“”，第1行，在
文件“/home/kevin/Code/python/flask/terminus/venv/local/lib/python2.7/site packages/sqlalchemy/sql/elements.py”，第468行，编译
返回self.\u编译器（方言，bind=bind，**kw）
文件“/home/kevin/Code/python/flask/terminus/venv/local/lib/python2.7/site packages/sqlalchemy/sql/ddl.py”，第25行，在编译器中
返回方言.ddl_编译器（方言，self，**kw）
文件“/home/kevin/Code/python/flask/terminus/venv/local/lib/python2.7/site packages/sqlalchemy/sql/compiler.py”，第197行，在__
self.string=self.process（self.statement，**compile_-kwargs）
文件“/home/kevin/Code/python/flask/terminus/venv/local/lib/python2.7/site packages/sqlalchemy/sql/compiler.py”，第220行，正在处理中
返回对象\u编译器\u分派（自身，**kwargs）
文件“/home/kevin/Code/python/flask/terminus/venv/local/lib/python2.7/site packages/sqlalchemy/ext/compiler.py”，第410行，在
λ*arg，**千瓦：现有（*arg，**千瓦））
文件“/home/kevin/Code/python/flask/terminus/venv/local/lib/python2.7/site packages/sqlalchemy/ext/compiler.py”，第448行，在调用中__
返回fn（元素，编译器，**kw）
文件“/home/kevin/Code/python/flask/terminus/venv/local/lib/python2.7/site packages/alembic/ddl/mysql.py”，第171行，在mysql\u change\u列中
自动增量=element.autoincrement
文件“/home/kevin/Code/python/flask/terminus/venv/local/lib/python2.7/site-packages/alembic/ddl/mysql.py”，第190行，在
spec+=“默认%s”%\u呈现值（编译器、服务器\u默认）
文件“/home/kevin/Code/python/flask/terminus/venv/local/lib/python2.7/site-packages/alembic/ddl/mysql.py”，第179行，在渲染值中
返回compiler.sql\u compiler.process（expr）
文件“/home/kevin/Code/python/flask/terminus/venv/local/lib/python2.7/site packages/sqlalchemy/sql/compiler.py”，第220行，正在处理中
返回对象\u编译器\u分派（自身，**kwargs）
AttributeError:“int”对象没有属性“\u编译器\u分派”

好吧，我只是