python – Flask WTF’StringField’对象没有属性’translate’

概述我是 Python的新手,我一直关注 Miguel Grinberg Flask Mega-Tutorial. 我有一个非常简单的表单,当我尝试提交时,我收到以下错误： AttributeError: ‘StringField’ object has no attribute ‘translate’ 这是表格： from flask.ext.wtf import Formfrom wtforms 我是 Python的新手,我一直关注 Miguel Grinberg Flask Mega-Tutorial.

我有一个非常简单的表单,当我尝试提交时,我收到以下错误：

AttributeError: ‘StringFIEld’ object has no attribute ‘translate’

这是表格：

from flask.ext.wtf import Formfrom wtforms import StringFIEldfrom wtforms.valIDators import Datarequiredclass CreateSubjectForm(Form):    name = StringFIEld('name',valIDators=[Datarequired()])

和vIEws.py：

@app.route('/create_subject',methods=['GET','POST'])def create_subject():    form = CreateSubjectForm()    if form.valIDate_on_submit():        subject = Subject(name=form.name)        db.session.add(subject)        db.session.commit()    return render_template('create_subject.HTML',Title='Create Subject',form=form)

我的模板如下：

{% extends "base.HTML" %}{% block content %}    <h2>Create Subject</h2>    <form action="" method="post" name="create_subject">        {{ form.hIDden_tag() }}        <div >name: </div>        <div >{{ form.name(size=45) }}</div>        <input type="submit" value="Create">    </form>{% endblock %}

我一直无法解决这个问题,但这就是我所看到的.

PyCharm告诉我它无法在flask.ext.wtf导入Form的行中找到flask.ext中的wtf,这引起了一个担忧.我使用的是Python 2.7.从研究看来,这是导入2.7的正确方法.我尝试将其更改为来自flask_wtf导入Form并且PyCharm错误消失,但行为是相同的.

从追溯我认为看起来版本和软件包出了问题.我仔细检查我用pip.install安装了所有东西,看起来我做了 – 这是来自虚拟环境的pip.freeze：

Babel==2.2.0blinker==1.4coverage==4.0.3decorator==4.0.9Flask==0.10.1flask-babel==0.9Flask-Login==0.3.2Flask-Mail==0.9.1Flask-OpenID==1.2.5Flask-sqlAlchemy==2.1Flask-WhooshAlchemy==0.56Flask-WTF==0.12flipflop==1.0guess-language==0.2itsdangerous==0.24Jinja2==2.8MarkupSafe==0.23pbr==1.8.1PyMysqL==0.7.2python-openID==2.2.5pytz==2016.3six==1.10.0speaklater==1.3sqlAlchemy==1.0.12sqlalchemy-migrate==0.10.0sqlparse==0.1.19Tempita==0.5.2Werkzeug==0.11.5Whoosh==2.7.3WTForms==2.1

这是追溯：

> Traceback (most recent call last):   file> "C:\Users\timni\onedrive\dev\studyplanner\venv\lib\site-packages\flask\app.py",> line 1836,in __call__>     return self.wsgi_app(environ,start_response)   file "C:\Users\timni\onedrive\dev\studyplanner\venv\lib\site-packages\flask\app.py",> line 1820,in wsgi_app>     response = self.make_response(self.handle_exception(e))   file "C:\Users\timni\onedrive\dev\studyplanner\venv\lib\site-packages\flask\app.py",> line 1403,in handle_exception>     reraise(exc_type,exc_value,tb)   file "C:\Users\timni\onedrive\dev\studyplanner\venv\lib\site-packages\flask\app.py",> line 1817,in wsgi_app>     response = self.full_dispatch_request()   file "C:\Users\timni\onedrive\dev\studyplanner\venv\lib\site-packages\flask\app.py",> line 1477,in full_dispatch_request>     rv = self.handle_user_exception(e)   file "C:\Users\timni\onedrive\dev\studyplanner\venv\lib\site-packages\flask\app.py",> line 1381,in handle_user_exception>     reraise(exc_type,> line 1475,in full_dispatch_request>     rv = self.dispatch_request()   file "C:\Users\timni\onedrive\dev\studyplanner\venv\lib\site-packages\flask\app.py",> line 1461,in dispatch_request>     return self.vIEw_functions[rule.endpoint](**req.vIEw_args)   file "C:\Users\timni\onedrive\dev\studyplanner\app\vIEws.py",line 24,in> create_subject>     db.session.commit()   file "C:\Users\timni\onedrive\dev\studyplanner\venv\lib\site-packages\sqlalchemy\orm\scoping.py",> line 157,in do>     return getattr(self.registry(),name)(*args,**kwargs)   file "C:\Users\timni\onedrive\dev\studyplanner\venv\lib\site-packages\sqlalchemy\orm\session.py",> line 801,in commit>     self.transaction.commit()   file "C:\Users\timni\onedrive\dev\studyplanner\venv\lib\site-packages\sqlalchemy\orm\session.py",> line 392,in commit>     self._prepare_impl()   file "C:\Users\timni\onedrive\dev\studyplanner\venv\lib\site-packages\sqlalchemy\orm\session.py",> line 372,in _prepare_impl>     self.session.flush()   file "C:\Users\timni\onedrive\dev\studyplanner\venv\lib\site-packages\sqlalchemy\orm\session.py",> line 2019,in flush>     self._flush(objects)   file "C:\Users\timni\onedrive\dev\studyplanner\venv\lib\site-packages\sqlalchemy\orm\session.py",> line 2137,in _flush>     transaction.rollback(_capture_exception=True)   file "C:\Users\timni\onedrive\dev\studyplanner\venv\lib\site-packages\sqlalchemy\util\langhelpers.py",> line 60,in __exit__>     compat.reraise(exc_type,exc_tb)   file "C:\Users\timni\onedrive\dev\studyplanner\venv\lib\site-packages\sqlalchemy\orm\session.py",> line 2101,in _flush>     flush_context.execute()   file "C:\Users\timni\onedrive\dev\studyplanner\venv\lib\site-packages\sqlalchemy\orm\unitofwork.py",> line 373,in execute>     rec.execute(self)   file "C:\Users\timni\onedrive\dev\studyplanner\venv\lib\site-packages\sqlalchemy\orm\unitofwork.py",> line 532,in execute>     uow   file "C:\Users\timni\onedrive\dev\studyplanner\venv\lib\site-packages\sqlalchemy\orm\persistence.py",> line 174,in save_obj>     mapper,table,insert)   file "C:\Users\timni\onedrive\dev\studyplanner\venv\lib\site-packages\sqlalchemy\orm\persistence.py",> line 800,in _emit_insert_statements>     execute(statement,params)   file "C:\Users\timni\onedrive\dev\studyplanner\venv\lib\site-packages\sqlalchemy\engine\base.py",> line 914,in execute>     return meth(self,multiparams,params)   file "C:\Users\timni\onedrive\dev\studyplanner\venv\lib\site-packages\sqlalchemy\sql\elements.py",> line 323,in _execute_on_connection>     return connection._execute_clauseelement(self,params)   file> "C:\Users\timni\onedrive\dev\studyplanner\venv\lib\site-packages\sqlalchemy\engine\base.py",> line 1010,in _execute_clauseelement>     compiled_sql,distilled_params   file "C:\Users\timni\onedrive\dev\studyplanner\venv\lib\site-packages\sqlalchemy\engine\base.py",> line 1146,in _execute_context>     context)   file "C:\Users\timni\onedrive\dev\studyplanner\venv\lib\site-packages\sqlalchemy\engine\base.py",> line 1344,in _handle_dbAPI_exception>     util.reraise(*exc_info)   file "C:\Users\timni\onedrive\dev\studyplanner\venv\lib\site-packages\sqlalchemy\engine\base.py",> line 1139,in _execute_context>     context)   file "C:\Users\timni\onedrive\dev\studyplanner\venv\lib\site-packages\sqlalchemy\engine\default.py",> line 450,in do_execute>     cursor.execute(statement,parameters)   file "C:\Users\timni\onedrive\dev\studyplanner\venv\lib\site-packages\pyMysqL\cursors.py",> line 156,in execute>     query = self.mogrify(query,args)   file "C:\Users\timni\onedrive\dev\studyplanner\venv\lib\site-packages\pyMysqL\cursors.py",> line 135,in mogrify>     query = query % self._escape_args(args,conn)   file "C:\Users\timni\onedrive\dev\studyplanner\venv\lib\site-packages\pyMysqL\cursors.py",> line 115,in _escape_args>     return dict((key,conn.escape(val)) for (key,val) in args.items())   file> "C:\Users\timni\onedrive\dev\studyplanner\venv\lib\site-packages\pyMysqL\cursors.py",in <genexpr>>     return dict((key,val) in args.items())   file> "C:\Users\timni\onedrive\dev\studyplanner\venv\lib\site-packages\pyMysqL\connections.py",> line 781,in escape>     return escape_item(obj,self.charset,mapPing=mapPing)   file "C:\Users\timni\onedrive\dev\studyplanner\venv\lib\site-packages\pyMysqL\converters.py",> line 26,in escape_item>     val = encoder(val,mapPing)   file "C:\Users\timni\onedrive\dev\studyplanner\venv\lib\site-packages\pyMysqL\converters.py",> line 109,in escape_unicode>     return u"'%s'" % _escape_unicode(value)   file "C:\Users\timni\onedrive\dev\studyplanner\venv\lib\site-packages\pyMysqL\converters.py",> line 72,in _escape_unicode>     return value.translate(_escape_table) AttributeError: 'StringFIEld' object has no attribute 'translate'

所以在这一点上我很难过.任何帮助将非常感谢.谢谢.

解决方法 发生错误的原因是正在使用StringFIEld实例构造Subject实例,但需要的是StringFIEld数据的值.

而不是

subject = Subject(name=form.name)  # form.name is a StringFIEld

做

subject = Subject(name=form.name.data)

线索在异常消息AttributeError中：’StringFIEld’对象没有属性’translate’ – translate是一个字符串方法,所以它建议某些不是字符串的东西被传递给需要字符串的东西.

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