Flask SQLAlchemy 表存在但仍然没有这样的表错误

Question

我的 Flask 数据库有问题。我打开了 db 文件，发现这些表存在，但是当我尝试在数据库中创建一个新用户时，我得到一个 no such table 错误。

这是我的数据库 config.py 文件

CSRF_ENABLED = True
SECRET_KEY = 'asshat'

import os
basedir = os.path.abspath(os.path.dirname(__file__))

SQLALCHEMY_DATABASE_URI = 'sqlite:///' + os.path.join(basedir, 'app.db')
SQLALCHEMY_MIGRATE_REPO = os.path.join(basedir, 'db_repository')

我的应用文件夹结构是

pineapple/
-------app.db
-------config.py
-------xapp.wsgi
-------venv/
-------app/
-------------app.py
-------------views.py
-------------models.py
-------------forms.py
-------------static/
-------------templates/

当我打开站点 url 时一切正常，但是当我尝试使用它注册时返回 500 内部服务器错误。所以我检查了 apache 错误日志，我得到了这个

[Fri Aug 08 02:09:55.819330 2014] [:error] [pid 12452] ERROR:app:Exception on /signup [ POST]
[Fri Aug 08 02:09:55.819403 2014] [:error] [pid 12452] Traceback (most recent call last):
[Fri Aug 08 02:09:55.819413 2014] [:error] [pid 12452]   File "/var/www/html/pineapple-express/venv/lib/python2.7/site-packages/flask/app.py", line 1817, in wsgi_app
[Fri Aug 08 02:09:55.819422 2014] [:error] [pid 12452]     response = self.full_dispatch_request()
[Fri Aug 08 02:09:55.819430 2014] [:error] [pid 12452]   File "/var/www/html/pineapple-express/venv/lib/python2.7/site-packages/flask/app.py", line 1477, in full_dispatch_request
[Fri Aug 08 02:09:55.819439 2014] [:error] [pid 12452]     rv = self.handle_user_exception(e)
[Fri Aug 08 02:09:55.819447 2014] [:error] [pid 12452]   File "/var/www/html/pineapple-express/venv/lib/python2.7/site-packages/flask/app.py", line 1381, in handle_user_exception
[Fri Aug 08 02:09:55.819456 2014] [:error] [pid 12452]     reraise(exc_type, exc_value, tb)
[Fri Aug 08 02:09:55.819464 2014] [:error] [pid 12452]   File "/var/www/html/pineapple-express/venv/lib/python2.7/site-packages/flask/app.py", line 1475, in full_dispatch_request
[Fri Aug 08 02:09:55.819473 2014] [:error] [pid 12452]     rv = self.dispatch_request()
[Fri Aug 08 02:09:55.819481 2014] [:error] [pid 12452]   File "/var/www/html/pineapple-express/venv/lib/python2.7/site-packages/flask/app.py", line 1461, in dispatch_request
[Fri Aug 08 02:09:55.819490 2014] [:error] [pid 12452]     return self.view_functions[rule.endpoint](**req.view_args)
[Fri Aug 08 02:09:55.819499 2014] [:error] [pid 12452]   File "/var/www/html/pineapple-express/app/views.py", line 33, in signup
[Fri Aug 08 02:09:55.819507 2014] [:error] [pid 12452]     db.session.commit()
[Fri Aug 08 02:09:55.819515 2014] [:error] [pid 12452]   File "/var/www/html/pineapple-express/venv/lib/python2.7/site-packages/sqlalchemy/orm/scoping.py", line 150, in do
[Fri Aug 08 02:09:55.819524 2014] [:error] [pid 12452]     return getattr(self.registry(), name)(*args, **kwargs)
[Fri Aug 08 02:09:55.819532 2014] [:error] [pid 12452]   File "/var/www/html/pineapple-express/venv/lib/python2.7/site-packages/sqlalchemy/orm/session.py", line 776, in commit
[Fri Aug 08 02:09:55.819540 2014] [:error] [pid 12452]     self.transaction.commit()
[Fri Aug 08 02:09:55.819549 2014] [:error] [pid 12452]   File "/var/www/html/pineapple-express/venv/lib/python2.7/site-packages/sqlalchemy/orm/session.py", line 377, in commit
[Fri Aug 08 02:09:55.819583 2014] [:error] [pid 12452]     self._prepare_impl()
[Fri Aug 08 02:09:55.819591 2014] [:error] [pid 12452]   File "/var/www/html/pineapple-express/venv/lib/python2.7/site-packages/sqlalchemy/orm/session.py", line 357, in _prepare_impl
[Fri Aug 08 02:09:55.819599 2014] [:error] [pid 12452]     self.session.flush()
[Fri Aug 08 02:09:55.819606 2014] [:error] [pid 12452]   File "/var/www/html/pineapple-express/venv/lib/python2.7/site-packages/sqlalchemy/orm/session.py", line 1919, in flush
[Fri Aug 08 02:09:55.819613 2014] [:error] [pid 12452]     self._flush(objects)
[Fri Aug 08 02:09:55.819621 2014] [:error] [pid 12452]   File "/var/www/html/pineapple-express/venv/lib/python2.7/site-packages/sqlalchemy/orm/session.py", line 2037, in _flush
[Fri Aug 08 02:09:55.819629 2014] [:error] [pid 12452]     transaction.rollback(_capture_exception=True)
[Fri Aug 08 02:09:55.819636 2014] [:error] [pid 12452]   File "/var/www/html/pineapple-express/venv/lib/python2.7/site-packages/sqlalchemy/util/langhelpers.py", line 60, in     __exit__
[Fri Aug 08 02:09:55.819644 2014] [:error] [pid 12452]     compat.reraise(exc_type, exc_value, exc_tb)
[Fri Aug 08 02:09:55.819651 2014] [:error] [pid 12452]   File "/var/www/html/pineapple-express/venv/lib/python2.7/site-packages/sqlalchemy/orm/session.py", line 2001, in _flush
[Fri Aug 08 02:09:55.819659 2014] [:error] [pid 12452]     flush_context.execute()
[Fri Aug 08 02:09:55.819666 2014] [:error] [pid 12452]   File "/var/www/html/pineapple-express/venv/lib/python2.7/site-packages/sqlalchemy/orm/unitofwork.py", line 372, in execute
[Fri Aug 08 02:09:55.819673 2014] [:error] [pid 12452]     rec.execute(self)
[Fri Aug 08 02:09:55.819681 2014] [:error] [pid 12452]   File "/var/www/html/pineapple-express/venv/lib/python2.7/site-packages/sqlalchemy/orm/unitofwork.py", line 526, in execute
[Fri Aug 08 02:09:55.819688 2014] [:error] [pid 12452]     uow
[Fri Aug 08 02:09:55.819695 2014] [:error] [pid 12452]   File "/var/www/html/pineapple-express/venv/lib/python2.7/site-packages/sqlalchemy/orm/persistence.py", line 65, in save_obj
[Fri Aug 08 02:09:55.819703 2014] [:error] [pid 12452]     mapper, table, insert)
[Fri Aug 08 02:09:55.819711 2014] [:error] [pid 12452]   File "/var/www/html/pineapple-express/venv/lib/python2.7/site-packages/sqlalchemy/orm/persistence.py", line 602, in _emit_insert_statements
[Fri Aug 08 02:09:55.819719 2014] [:error] [pid 12452]     execute(statement, params)
[Fri Aug 08 02:09:55.819726 2014] [:error] [pid 12452]   File "/var/www/html/pineapple-express/venv/lib/python2.7/site-packages/sqlalchemy/engine/base.py", line 729, in execute
[Fri Aug 08 02:09:55.819734 2014] [:error] [pid 12452]     return meth(self, multiparams, params)
[Fri Aug 08 02:09:55.819742 2014] [:error] [pid 12452]   File "/var/www/html/pineapple-express/venv/lib/python2.7/site-packages/sqlalchemy/sql/elements.py", line 321, in _execute_on_connection
[Fri Aug 08 02:09:55.819749 2014] [:error] [pid 12452]     return connection._execute_clauseelement(self, multiparams, params)
[Fri Aug 08 02:09:55.819757 2014] [:error] [pid 12452]   File "/var/www/html/pineapple-express/venv/lib/python2.7/site-packages/sqlalchemy/engine/base.py", line 826, in _execute_clauseelement
[Fri Aug 08 02:09:55.819765 2014] [:error] [pid 12452]     compiled_sql, distilled_params
[Fri Aug 08 02:09:55.819772 2014] [:error] [pid 12452]   File "/var/www/html/pineapple-express/venv/lib/python2.7/site-packages/sqlalchemy/engine/base.py", line 958, in _execute_context
[Fri Aug 08 02:09:55.819780 2014] [:error] [pid 12452]     context)
[Fri Aug 08 02:09:55.819787 2014] [:error] [pid 12452]   File "/var/www/html/pineapple-express/venv/lib/python2.7/site-packages/sqlalchemy/engine/base.py", line 1160, in _handle_dbapi_exception
[Fri Aug 08 02:09:55.819795 2014] [:error] [pid 12452]     exc_info
[Fri Aug 08 02:09:55.819802 2014] [:error] [pid 12452]   File "/var/www/html/pineapple-express/venv/lib/python2.7/site-packages/sqlalchemy/util/compat.py", line 199, in raise_from_cause
[Fri Aug 08 02:09:55.819819 2014] [:error] [pid 12452]     reraise(type(exception), exception, tb=exc_tb)
[Fri Aug 08 02:09:55.819828 2014] [:error] [pid 12452]   File "/var/www/html/pineapple-express/venv/lib/python2.7/site-packages/sqlalchemy/engine/base.py", line 951, in _execute_context
[Fri Aug 08 02:09:55.819835 2014] [:error] [pid 12452]     context)
[Fri Aug 08 02:09:55.819842 2014] [:error] [pid 12452]   File "/var/www/html/pineapple-express/venv/lib/python2.7/site-packages/sqlalchemy/engine/default.py", line 436, in do_execute
[Fri Aug 08 02:09:55.819850 2014] [:error] [pid 12452]     cursor.execute(statement, parameters)
[Fri Aug 08 02:09:55.819858 2014] [:error] [pid 12452] OperationalError: (OperationalError) no such table: user u'INSERT INTO user (nickname, password, email, role) VALUES (?, ?, ?, ?)'

它告诉我这些表不存在，但通过使用数据库浏览器实际查看数据库，我知道它们在那里。谁能告诉我我做错了什么？如果有任何我未能提供的信息，请询问，我会将其添加到帖子中。

编辑

来自视图的注册路径

@app.route('/signup', methods=['GET', 'POST'])
def signup():
    form = Signup(request.form)

    if form.validate_on_submit():
        user = User(form.usrnam.data,form.passw.data,form.email.data)
        db.session.add(user)
        db.session.commit()
        os.makedirs('app/static/%s' % form.usrnam.data)
        flash('You are now a registered user')
        return redirect(url_for('login'))

    return render_template('signup.html', title='Sign Up', form=form)

编辑

这是我的用户模型

class User(db.Model):
    id = db.Column(db.Integer, primary_key = True)
    nickname = db.Column(db.String(64), index = True, unique = True)
    password = db.Column(db.String(10), index = True, unique = True)
    email = db.Column(db.String(120), index = True, unique = True)
    role = db.Column(db.SmallInteger, default = ROLE_USER)
    uploads = db.relationship('Upload', backref = 'author', lazy = 'dynamic')
    #registered_on = db.Column('registered_on' , db.DateTime)

    def __init__(self , nickname ,password , email):
        self.nickname = nickname
        self.password = password
        self.email = email
        #self.registered_on = datetime.utcnow()

    def is_authenticated(self):
        return True

    def is_active(self):
        return True

    def is_anonymous(self):
        return False

    def get_id(self):
        return unicode(self.id)

    def __repr__(self):
        return '<User %r>' % (self.nickname)

Answer 1

在代码中引用您的表格时，您是否需要将 User 大写？