我已经在本地成功运行了flask应用，但是当我将其部署到产品环境中时，出现此错误：
[2019-08-26 00:15:36,229] ERROR in app: Exception on /formulas [GET]
Traceback (most recent call last):
File "/home/ubuntu/.local/lib/python3.5/site-packages/sqlalchemy/engine/base.py", line 1244, in _execute_context
cursor, statement, parameters, context
File "/home/ubuntu/.local/lib/python3.5/site-packages/sqlalchemy/engine/default.py", line 552, in do_execute
cursor.execute(statement, parameters)
sqlite3.OperationalError: no such column: false
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "/home/ubuntu/.local/lib/python3.5/site-packages/flask/app.py", line 1949, in full_dispatch_request
rv = self.dispatch_request()
File "/home/ubuntu/.local/lib/python3.5/site-packages/flask/app.py", line 1935, in dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File "app.py", line 96, in get_all_formulas
for formula in query_results:
File "/home/ubuntu/.local/lib/python3.5/site-packages/sqlalchemy/orm/query.py", line 3334, in __iter__
return self._execute_and_instances(context)
File "/home/ubuntu/.local/lib/python3.5/site-packages/sqlalchemy/orm/query.py", line 3359, in _execute_and_instances
result = conn.execute(querycontext.statement, self._params)
File "/home/ubuntu/.local/lib/python3.5/site-packages/sqlalchemy/engine/base.py", line 988, in execute
return meth(self, multiparams, params)
File "/home/ubuntu/.local/lib/python3.5/site-packages/sqlalchemy/sql/elements.py", line 287, in _execute_on_connection
return connection._execute_clauseelement(self, multiparams, params)
File "/home/ubuntu/.local/lib/python3.5/site-packages/sqlalchemy/engine/base.py", line 1107, in _execute_clauseelement
distilled_params,
File "/home/ubuntu/.local/lib/python3.5/site-packages/sqlalchemy/engine/base.py", line 1248, in _execute_context
e, statement, parameters, cursor, context
File "/home/ubuntu/.local/lib/python3.5/site-packages/sqlalchemy/engine/base.py", line 1466, in _handle_dbapi_exception
util.raise_from_cause(sqlalchemy_exception, exc_info)
File "/home/ubuntu/.local/lib/python3.5/site-packages/sqlalchemy/util/compat.py", line 398, in raise_from_cause
reraise(type(exception), exception, tb=exc_tb, cause=cause)
File "/home/ubuntu/.local/lib/python3.5/site-packages/sqlalchemy/util/compat.py", line 152, in reraise
raise value.with_traceback(tb)
File "/home/ubuntu/.local/lib/python3.5/site-packages/sqlalchemy/engine/base.py", line 1244, in _execute_context
cursor, statement, parameters, context
File "/home/ubuntu/.local/lib/python3.5/site-packages/sqlalchemy/engine/default.py", line 552, in do_execute
cursor.execute(statement, parameters)
sqlalchemy.exc.OperationalError: (sqlite3.OperationalError) no such column: false
[SQL: SELECT all_formulas.id AS all_formulas_id, all_formulas.name AS all_formulas_name, all_formulas.abbreviation AS all_formulas_abbreviation, all_fo
rmulas.category_name AS all_formulas_category_name, all_formulas.category_id AS all_formulas_category_id, all_formulas.parent_id AS all_formulas_parent
_id, all_formulas.has_children AS all_formulas_has_children, all_formulas.function AS all_formulas_function
FROM all_formulas
WHERE all_formulas.parent_id IS NULL]
(Background on this error at: http://sqlalche.me/e/e3q8)
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/home/ubuntu/.local/lib/python3.5/site-packages/flask/app.py", line 2446, in wsgi_app
response = self.full_dispatch_request()
File "/home/ubuntu/.local/lib/python3.5/site-packages/flask/app.py", line 1951, in full_dispatch_request
rv = self.handle_user_exception(e)
File "/home/ubuntu/.local/lib/python3.5/site-packages/flask_api/app.py", line 96, in handle_user_exception
app_handlers = self.error_handler_spec[None].get(None, ())
KeyError
如您所见，主要错误是sqlite3.OperationalError: no such column: false。但是，false在SQLAlchemy生成的SQL中不存在。我也在没有SQLAlchemy的情况下尝试了此操作，并得到了相同的结果。
我的所有研究似乎都表明这些错误是由查询中某些表或列不存在引起的。但是，我的错误有所不同，因为false不是表，列，甚至不是SQL。
有人有什么建议吗？
编辑＃1
这是python SQLAlchemy模型类：
class AllFormulas(db.Model):
id = db.Column(db.Integer, primary_key=True)
name = db.Column(db.String, unique=True, nullable=False)
abbreviation = db.Column(db.String, unique=True, nullable=False)
category_name = db.Column(db.String, nullable=False)
category_id = db.Column(db.Integer, nullable=False)
parent_id = db.Column(db.Integer, nullable=True)
has_children = db.Column(db.Boolean, nullable=True)
function = db.Column(db.String, nullable=True)
def as_dict(self):
return {
'id': self.id,
'name': self.name,
'abbreviation': self.abbreviation,
'category': self.category_name,
'parentId': self.parent_id,
'hasChildren': self.has_children,
'function': self.function
}
这是python SQLAlchemy查询调用（请参见下面的注释后面的行）：
@app.route('/formulas', methods=['GET', 'OPTIONS'])
def get_all_formulas():
if request.method == 'OPTIONS':
return _build_cors_preflight_response()
else:
category = request.args.get('category')
search = request.args.get('search')
if category:
query_results = AllFormulas.query.filter(AllFormulas.category_id == category)
elif search:
query_results = AllFormulas.query.filter(or_(AllFormulas.name.ilike('%{search}%'.format(search)),
AllFormulas.abbreviation.ilike('%{search}%'.format(search))))
else:
# This next line is being run and throws the SQLite error.
query_results = AllFormulas.query.filter(AllFormulas.parent_id == None)
json = []
for formula in query_results:
json.append(formula.as_dict())
if IS_PROD:
return json
else:
return _corsify_actual_response(json)
编辑＃2
我直接使用sqlite3命令行在生产环境中查询SQLite数据库。这是我得到的：
ubuntu@ip-xxx-xx-x-xx:~/apps/my-app/data$ sqlite3 math.db
SQLite version 3.11.0 2016-02-15 17:29:24
Enter ".help" for usage hints.
sqlite> select *
...> from all_formulas;
Error: no such column: false
但是，相同的查询在我的本地环境中可以正常工作：
sm7chrisjones:data chris.jones$ sqlite3 math.db
SQLite version 3.24.0 2018-06-04 14:10:15
Enter ".help" for usage hints.
sqlite> select * from all_formulas;
0|Kilograms|kg|0|Medical|2|0|
0|Kilograms|kg|0|Medical|9|0|
0|Kilograms|kg|0|Medical|12|0|
0|Kilograms|kg|0|Medical|13|0|
0|Kilograms|kg|0|Medical|14|0|
0|Kilograms|kg|0|Medical|15|0|
1|Liters|l|0|Medical|2|0|
sqlite>
我要做的全部工作就是将项目上传到S3，登录到我的Ubuntu生产环境，并将项目文件从S3复制到生产环境。有谁知道为什么这些步骤会产生此错误？
谢谢！
答案 0 :(得分：0)
由于@furas的建议，我发现该应用程序的SQLite数据库中的表正确返回了查询结果，但ncks -X（这是一个视图）却没有。经过进一步调查，似乎all_formulas视图SQL定义在我的本地Mac环境和我的Ubuntu产品环境之间的行为有所不同。 all_formulas视图的SQL定义是：
all_formulas我能够通过使用表示CREATE VIEW all_formulas as
select f.id,
f.name,
f.abbreviation,
c.id as category_id,
c.name as category_name,
fr.parent_id,
case when (select count(*)
from formula_relationships
where parent_id = f.id) = 0
then false -- THIS WAS CAUSING THE ERROR IN UBUNTU.
else true
end as has_children,
f.function
from formula f
left join formula_relationships fr on f.id = fr.child_id
left join category c on f.category_id = c.id
where f.category_id = c.id;
（0）和false（1）的SQLite整数来修复错误。因此，更正后的视图SQL定义为：
true感谢大家在解决此问题方面的帮助！