如何更改Flask-peewee中的UserDoesNotExist SELECT行为 – pyth

我使用flask-peewee制作一个API,如果用户不存在于表中,我想返回一个404 json但看起来好像是在抛出500错误而不是404错误json：

这是我得到的错误：

UserDoesNotExist: instance matching query does not exist:
SQL: SELECT t1.`id`,t1.`username`,t1.`password`,t1.`email`,t1.`token`,t1.`join_date`,t1.`active`,t1.`admin` FROM `user` AS t1 WHERE ((t1.`active` = %s) AND (t1.`username` = %s))
[Wed Sep 18 20:26:24 2013] [error] [client 173.225.41.154] PARAMS: [True,u'fery3']

码：

@app.route('/api/login/',methods=['POST'])
def authenticate1():
    if request.method == 'POST' and request.form['username']:
        active = User.select().where(User.active==True)
        user2 = User.select().where(User.username==request.form['username']).get()
        try:
            user = active.where(User.username==request.form['username']).get()
        except exceptions:  # includes simplejson.decoder.JSONDecodeError
            return make_response(jsonify( { 'error': 'Bad request' } ),400)
        else:
            if not user.check_password(request.form['password']):
                return make_response(jsonify( { 'error': 'Bad request','message': 'Wrong Username or Password'} ),400)
        return make_response(jsonify( { "meta":{'model':'login','code':'200','status':'ok','message':'successfully loggedin'},'objects':[{'username': user2.username,'email':user2.email,'token' : user2.token }] } ),200)

active = User.select().where(User.active == True)
try:
    user = active.where(User.username == request.form['username']).get()
except User.DoesNotExist:
    return make_response(jsonify({'error': 'Bad request'}),400)
else:
    if not user.check_password(...)

（编辑：李大同）

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