我的应用程序正在我的主 PC 上运行。我试图将应用程序克隆到我的笔记本电脑（我尝试在 PC 上的不同目录中对其进行初始化，但问题是相同的，因此问题不在于笔记本电脑），并且在使用flask db init我的 db 初始化数据库时出现以下错误：
sqlalchemy.exc.OperationalError: (sqlite3.OperationalError) no such table: race [SQL: 'SELECT race.id AS race_id, race.name AS race_name \nFROM race'] (Background on this error at: http://sqlalche.me/e/e3q8)
我想要做的是在我的一种形式中包含一个 wtforms，RadioField其中包含基于db 中种族表的选择。因此，对于该表中的每一行，我都希望在选择中做出一个选择。表单的重要部分如下所示：
class RegistrationForm(FlaskForm):
race = RadioField('Race', validators=[InputRequired('Choose a race.')],
choices=races, coerce=int)
并且种族变量在这样的形式之外（在形式本身之前）：
with create_app().app_context():
races = [(race.id, race.name.capitalize()) for race in Race.query.all()]
我认为最后一行是调用堆栈中的问题：
Traceback (most recent call last):
File "/home/dareon4/workspace/test/venv/bin/flask", line 11, in <module>
sys.exit(main())
File "/home/dareon4/workspace/test/venv/lib64/python3.6/site-packages/flask/cli.py", line 894, in main
cli.main(args=args, prog_name=name)
File "/home/dareon4/workspace/test/venv/lib64/python3.6/site-packages/flask/cli.py", line 557, in main
return super(FlaskGroup, self).main(*args, **kwargs)
File "/home/dareon4/workspace/test/venv/lib64/python3.6/site-packages/click/core.py", line 697, in main
rv = self.invoke(ctx)
File "/home/dareon4/workspace/test/venv/lib64/python3.6/site-packages/click/core.py", line 1066, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File "/home/dareon4/workspace/test/venv/lib64/python3.6/site-packages/click/core.py", line 1066, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File "/home/dareon4/workspace/test/venv/lib64/python3.6/site-packages/click/core.py", line 895, in invoke
return ctx.invoke(self.callback, **ctx.params)
File "/home/dareon4/workspace/test/venv/lib64/python3.6/site-packages/click/core.py", line 535, in invoke
return callback(*args, **kwargs)
File "/home/dareon4/workspace/test/venv/lib64/python3.6/site-packages/click/decorators.py", line 17, in new_func
return f(get_current_context(), *args, **kwargs)
File "/home/dareon4/workspace/test/venv/lib64/python3.6/site-packages/flask/cli.py", line 411, in decorator
with __ctx.ensure_object(ScriptInfo).load_app().app_context():
File "/home/dareon4/workspace/test/venv/lib64/python3.6/site-packages/flask/cli.py", line 372, in load_app
app = locate_app(self, import_name, name)
File "/home/dareon4/workspace/test/venv/lib64/python3.6/site-packages/flask/cli.py", line 235, in locate_app
__import__(module_name)
File "/home/dareon4/workspace/test/shapes.py", line 5, in <module>
app = create_app()
File "/home/dareon4/workspace/test/app/__init__.py", line 43, in create_app
from app.blueprints.auth import bp as auth_bp
File "/home/dareon4/workspace/test/app/blueprints/auth/__init__.py", line 7, in <module>
from . import routes
File "/home/dareon4/workspace/test/app/blueprints/auth/routes.py", line 13, in <module>
from .forms import LoginForm, RegistrationForm, ResetPasswordRequestForm, \
File "/home/dareon4/workspace/test/app/blueprints/auth/forms.py", line 19, in <module>
races = [(race.id, race.name.capitalize()) for race in Race.query.all()]
File "/home/dareon4/workspace/test/venv/lib64/python3.6/site-packages/sqlalchemy/orm/query.py", line 2836, in all
return list(self)
File "/home/dareon4/workspace/test/venv/lib64/python3.6/site-packages/sqlalchemy/orm/query.py", line 2988, in __iter__
return self._execute_and_instances(context)
File "/home/dareon4/workspace/test/venv/lib64/python3.6/site-packages/sqlalchemy/orm/query.py", line 3011, in _execute_and_instances
result = conn.execute(querycontext.statement, self._params)
File "/home/dareon4/workspace/test/venv/lib64/python3.6/site-packages/sqlalchemy/engine/base.py", line 948, in execute
return meth(self, multiparams, params)
File "/home/dareon4/workspace/test/venv/lib64/python3.6/site-packages/sqlalchemy/sql/elements.py", line 269, in _execute_on_connection
return connection._execute_clauseelement(self, multiparams, params)
File "/home/dareon4/workspace/test/venv/lib64/python3.6/site-packages/sqlalchemy/engine/base.py", line 1060, in _execute_clauseelement
compiled_sql, distilled_params
File "/home/dareon4/workspace/test/venv/lib64/python3.6/site-packages/sqlalchemy/engine/base.py", line 1200, in _execute_context
context)
File "/home/dareon4/workspace/test/venv/lib64/python3.6/site-packages/sqlalchemy/engine/base.py", line 1413, in _handle_dbapi_exception
exc_info
File "/home/dareon4/workspace/test/venv/lib64/python3.6/site-packages/sqlalchemy/util/compat.py", line 265, in raise_from_cause
reraise(type(exception), exception, tb=exc_tb, cause=cause)
File "/home/dareon4/workspace/test/venv/lib64/python3.6/site-packages/sqlalchemy/util/compat.py", line 248, in reraise
raise value.with_traceback(tb)
File "/home/dareon4/workspace/test/venv/lib64/python3.6/site-packages/sqlalchemy/engine/base.py", line 1193, in _execute_context
context)
File "/home/dareon4/workspace/test/venv/lib64/python3.6/site-packages/sqlalchemy/engine/default.py", line 509, in do_execute
cursor.execute(statement, parameters)
sqlalchemy.exc.OperationalError: (sqlite3.OperationalError) no such table: race [SQL: 'SELECT race.id AS race_id, race.name AS race_name \nFROM race'] (Background on this error at: http://sqlalche.me/e/e3q8)
所以问题是我在运行flask db init命令时没有初始化数据库，并且一行需要数据库存在。这可能没有解决方案，因此我不是在问如何更正此实现，而是在问如何正确执行以根据数据库中的行生成表单。我没有数百场比赛，所以我可以对它们进行硬编码，但我想这样做。
因此，经过一些谷歌搜索后，我发现您可以RadioField在视图中动态添加选项，如下所示：
@bp.route('/register', methods=['GET', 'POST'])
def register():
form = RegistrationForm()
form.race.choices = [(race.id, race.name.capitalize()) for race in Race.query.all()]
这正是我正在寻找的。
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我来说两句