플라스크 오류 처리

Question

flask-sqlalchemy에서 생성 된 오류를 잡으려고합니다. 디버거가 먼저 catch하므로 코드가 불행히도이 오류를 처리 할 수 ​​없습니다. 고유해야하지만 복제 된 필드가있는 데이터베이스에 레코드를 삽입하려고 할 때 발생합니다.이 문제를 해결할 수있는 방법이 있습니까? 이것은 역 추적입니다.

sqlalchemy.exc.IntegrityError 

IntegrityError: (IntegrityError) column username is not unique u'INSERT INTO user (username, password, karma) VALUES (?, ?, ?)' (u'Test', u'test', 0) 
Traceback (most recent call last) 

    * 
     File "/home/josh/Projects/masterpieces_of_code/env/lib/python2.6/site-packages/flask/app.py", line 889, in __call__ 

     [Display the sourcecode for this frame] [Open an interactive python shell in this frame] return self.wsgi_app(environ, start_response) 

    * 
     File "/home/josh/Projects/masterpieces_of_code/env/lib/python2.6/site-packages/flask/app.py", line 879, in wsgi_app 

     [Display the sourcecode for this frame] [Open an interactive python shell in this frame] response = self.make_response(self.handle_exception(e)) 

    * 
     File "/home/josh/Projects/masterpieces_of_code/env/lib/python2.6/site-packages/flask/app.py", line 876, in wsgi_app 

     [Display the sourcecode for this frame] [Open an interactive python shell in this frame] rv = self.dispatch_request() 

    * 
     File "/home/josh/Projects/masterpieces_of_code/env/lib/python2.6/site-packages/flask/app.py", line 695, in dispatch_request 

     [Display the sourcecode for this frame] [Open an interactive python shell in this frame] return self.view_functions[rule.endpoint](**req.view_args) 

    * 
     File "/home/josh/Projects/masterpieces_of_code/app.py", line 70, in create_user 

     [Display the sourcecode for this frame] [Open an interactive python shell in this frame] db.session.commit() 

    * 
     File "/usr/share/pyshared/sqlalchemy/orm/scoping.py", line 129, in do 

     [Display the sourcecode for this frame] [Open an interactive python shell in this frame] return getattr(self.registry(), name)(*args, **kwargs) 

    * 
     File "/usr/share/pyshared/sqlalchemy/orm/session.py", line 653, in commit 

     [Display the sourcecode for this frame] [Open an interactive python shell in this frame] self.transaction.commit() 

    * 
     File "/usr/share/pyshared/sqlalchemy/orm/session.py", line 364, in commit 

     [Display the sourcecode for this frame] [Open an interactive python shell in this frame] self._prepare_impl() 

    * 
     File "/usr/share/pyshared/sqlalchemy/orm/session.py", line 348, in _prepare_impl 

     [Display the sourcecode for this frame] [Open an interactive python shell in this frame] self.session.flush() 

    * 
     File "/usr/share/pyshared/sqlalchemy/orm/session.py", line 1346, in flush 

     [Display the sourcecode for this frame] [Open an interactive python shell in this frame] self._flush(objects) 

    * 
     File "/usr/share/pyshared/sqlalchemy/orm/session.py", line 1427, in _flush 

     [Display the sourcecode for this frame] [Open an interactive python shell in this frame] flush_context.execute() 

    * 
     File "/usr/share/pyshared/sqlalchemy/orm/unitofwork.py", line 299, in execute 

     [Display the sourcecode for this frame] [Open an interactive python shell in this frame] rec.execute(self) 

    * 
     File "/usr/share/pyshared/sqlalchemy/orm/unitofwork.py", line 443, in execute 

     [Display the sourcecode for this frame] [Open an interactive python shell in this frame] uow 

    * 
     File "/usr/share/pyshared/sqlalchemy/orm/mapper.py", line 1833, in _save_obj 

     [Display the sourcecode for this frame] [Open an interactive python shell in this frame] execute(statement, params) 

    * 
     File "/usr/share/pyshared/sqlalchemy/engine/base.py", line 1794, in execute 

     [Display the sourcecode for this frame] [Open an interactive python shell in this frame] object, *multiparams, **params) 

    * 
     File "/usr/share/pyshared/sqlalchemy/interfaces.py", line 149, in execute 

     [Display the sourcecode for this frame] [Open an interactive python shell in this frame] return execute(clauseelement, *multiparams, **params) 

    * 
     File "/usr/share/pyshared/sqlalchemy/engine/base.py", line 1157, in execute 

     [Display the sourcecode for this frame] [Open an interactive python shell in this frame] params) 

    * 
     File "/usr/share/pyshared/sqlalchemy/engine/base.py", line 1237, in _execute_clauseelement 

     [Display the sourcecode for this frame] [Open an interactive python shell in this frame] return self.__execute_context(context) 

    * 
     File "/usr/share/pyshared/sqlalchemy/engine/base.py", line 1268, in __execute_context 

     [Display the sourcecode for this frame] [Open an interactive python shell in this frame] context.parameters[0], context=context) 

    * 
     File "/usr/share/pyshared/sqlalchemy/engine/base.py", line 1806, in _cursor_execute 

     [Display the sourcecode for this frame] [Open an interactive python shell in this frame] cursor, statement, parameters, context, False) 

    * 
     File "/home/josh/Projects/masterpieces_of_code/env/lib/python2.6/site-packages/flaskext/sqlalchemy.py", line 115, in cursor_execute 

     [Display the sourcecode for this frame] [Open an interactive python shell in this frame] return execute(cursor, statement, parameters, context) 

    * 
     File "/usr/share/pyshared/sqlalchemy/engine/base.py", line 1367, in _cursor_execute 

     [Display the sourcecode for this frame] [Open an interactive python shell in this frame] context) 

    * 
     File "/usr/share/pyshared/sqlalchemy/engine/base.py", line 1360, in _cursor_execute 

     [Display the sourcecode for this frame] [Open an interactive python shell in this frame] context) 

    * 
     File "/usr/share/pyshared/sqlalchemy/engine/default.py", line 288, in do_execute 

     [Display the sourcecode for this frame] [Open an interactive python shell in this frame] cursor.execute(statement, parameters) 

    IntegrityError: (IntegrityError) column username is not unique u'INSERT INTO user (username, password, karma) VALUES (?, ?, ?)' (u'Test', u'test', 0) 

This is the Copy/Paste friendly version of the traceback. You can also paste this traceback into the public lodgeit pastebin: 

Traceback (most recent call last): 
    File "/home/josh/Projects/masterpieces_of_code/env/lib/python2.6/site-packages/flask/app.py", line 889, in __call__ 
    return self.wsgi_app(environ, start_response) 
    File "/home/josh/Projects/masterpieces_of_code/env/lib/python2.6/site-packages/flask/app.py", line 879, in wsgi_app 
    response = self.make_response(self.handle_exception(e)) 
    File "/home/josh/Projects/masterpieces_of_code/env/lib/python2.6/site-packages/flask/app.py", line 876, in wsgi_app 
    rv = self.dispatch_request() 
    File "/home/josh/Projects/masterpieces_of_code/env/lib/python2.6/site-packages/flask/app.py", line 695, in dispatch_request 
    return self.view_functions[rule.endpoint](**req.view_args) 
    File "/home/josh/Projects/masterpieces_of_code/app.py", line 70, in create_user 
    db.session.commit() 
    File "/usr/share/pyshared/sqlalchemy/orm/scoping.py", line 129, in do 
    return getattr(self.registry(), name)(*args, **kwargs) 
    File "/usr/share/pyshared/sqlalchemy/orm/session.py", line 653, in commit 
    self.transaction.commit() 
    File "/usr/share/pyshared/sqlalchemy/orm/session.py", line 364, in commit 
    self._prepare_impl() 
    File "/usr/share/pyshared/sqlalchemy/orm/session.py", line 348, in _prepare_impl 
    self.session.flush() 
    File "/usr/share/pyshared/sqlalchemy/orm/session.py", line 1346, in flush 
    self._flush(objects) 
    File "/usr/share/pyshared/sqlalchemy/orm/session.py", line 1427, in _flush 
    flush_context.execute() 
    File "/usr/share/pyshared/sqlalchemy/orm/unitofwork.py", line 299, in execute 
    rec.execute(self) 
    File "/usr/share/pyshared/sqlalchemy/orm/unitofwork.py", line 443, in execute 
    uow 
    File "/usr/share/pyshared/sqlalchemy/orm/mapper.py", line 1833, in _save_obj 
    execute(statement, params) 
    File "/usr/share/pyshared/sqlalchemy/engine/base.py", line 1794, in execute 
    object, *multiparams, **params) 
    File "/usr/share/pyshared/sqlalchemy/interfaces.py", line 149, in execute 
    return execute(clauseelement, *multiparams, **params) 
    File "/usr/share/pyshared/sqlalchemy/engine/base.py", line 1157, in execute 
    params) 
    File "/usr/share/pyshared/sqlalchemy/engine/base.py", line 1237, in _execute_clauseelement 
    return self.__execute_context(context) 
    File "/usr/share/pyshared/sqlalchemy/engine/base.py", line 1268, in __execute_context 
    context.parameters[0], context=context) 
    File "/usr/share/pyshared/sqlalchemy/engine/base.py", line 1806, in _cursor_execute 
    cursor, statement, parameters, context, False) 
    File "/home/josh/Projects/masterpieces_of_code/env/lib/python2.6/site-packages/flaskext/sqlalchemy.py", line 115, in cursor_execute 
    return execute(cursor, statement, parameters, context) 
    File "/usr/share/pyshared/sqlalchemy/engine/base.py", line 1367, in _cursor_execute 
    context) 
    File "/usr/share/pyshared/sqlalchemy/engine/base.py", line 1360, in _cursor_execute 
    context) 
    File "/usr/share/pyshared/sqlalchemy/engine/default.py", line 288, in do_execute 
    cursor.execute(statement, parameters) 
IntegrityError: (IntegrityError) column username is not unique u'INSERT INTO user (username, password, karma) VALUES (?, ?, ?)' (u'Test', u'test', 0) 

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Brought to you by DON'T PANIC, your friendly Werkzeug powered traceback interpreter. 

나는 오류를 처리하려고 할 때 플라스크 반응하는 방법을 언급하는 것을 잊었다. 나는 정의되지 않은 전역과 관련된 것을 얻는다. 여기에 대한 추적이 있습니다.

Traceback (most recent call last): 
    File "/home/josh/Projects/masterpieces_of_code/env/lib/python2.6/site-packages/flask/app.py", line 889, in __call__ 
    return self.wsgi_app(environ, start_response) 
    File "/home/josh/Projects/masterpieces_of_code/env/lib/python2.6/site-packages/flask/app.py", line 879, in wsgi_app 
    response = self.make_response(self.handle_exception(e)) 
    File "/home/josh/Projects/masterpieces_of_code/env/lib/python2.6/site-packages/flask/app.py", line 876, in wsgi_app 
    rv = self.dispatch_request() 
    File "/home/josh/Projects/masterpieces_of_code/env/lib/python2.6/site-packages/flask/app.py", line 695, in dispatch_request 
    return self.view_functions[rule.endpoint](**req.view_args) 
    File "/home/josh/Projects/masterpieces_of_code/app.py", line 72, in create_user 
    except(IntegrityError): 
NameError: global name 'IntegrityError' is not defined 

Answer 1

당신은 db.session.commit()을 수행하는 코드 블록에 create_user 기능 (masterpieces_of_code/app.py)에서 시도/캐치를 놓고, 거기에 예외를 처리해야합니다.

업데이트 : 것은 당신이 IntegrityError에 대한 NameError을 받고하다면 그것은 당신이 당신의 app.py에

from sqlalchemy.exc import IntegrityError 

누락 될 가능성을 의미한다. 이것은 Flask의 메시지가 아닙니다. Python이 app.py의 코드를 해석 할 때 알 수없는 이름 (가져 오기 누락으로 인해)에 대해 알려줍니다.