所以我刚开始将Wtforms与Flask结合使用，我设置了基本类并在forms.py中定义了我的所有字段，如此处所示......
from wtforms import Form, TextField, validators, PasswordField, DateField
class AddAccount(Form):
username = TextField('Username', [validators.Length('min=3, max=20')])
email = TextField('Email', [validators.Length('min=1, max=255')])
karma = TextField('Karma', [validators.Length('min=1, max=10000000')])
password = PasswordField('Password', [validators.Length('min=6, max=255')])
然后我将AddAccount课程导入views.py，您可以在此处看到...
from forms import AddAccount
@app.route('/dashboard/add', methods=['POST', 'GET'])
def add_account():
form = AddAccount(request.form)
if request.method == 'POST' and form.validate():
print('POST request')
return render_template('add_account.html', form=form)
这里是模板文件......
{% extends 'layout.html' %}
{% block body %}
<br>
<div class="jumbotron text-center">
<h1>Add an Account</h1>
<hr>
<form action="{{url_for('add_account')}}">
<div class="form-group">
{{render_field(form.username, class_='form-control')}}
</div>
<div class="form-group">
{{render_field(form.email, class_='form-control')}}
</div>
<div class="form-group">
{{render_field(form.password, class_='form-control')}}
</div>
<div class="form-group">
{{render_field(form.karma, class_='form-control')}}
</div>
</form>
</div>
{% endblock %}
整个装置导致此错误jinja2.exceptions.UndefinedError: 'render_field' is undefined，我完全不知道它为什么会发生或如何解决它。任何帮助将不胜感激。
如果它有帮助......这里是堆栈跟踪...
Traceback (most recent call last):
File "C:\Users\Hassan\AppData\Local\Programs\Python\Python36\lib\site-packages\flask\app.py", line 1997, in __call__
return self.wsgi_app(environ, start_response)
File "C:\Users\Hassan\AppData\Local\Programs\Python\Python36\lib\site-packages\flask\app.py", line 1985, in wsgi_app
response = self.handle_exception(e)
File "C:\Users\Hassan\AppData\Local\Programs\Python\Python36\lib\site-packages\flask\app.py", line 1540, in handle_exception
reraise(exc_type, exc_value, tb)
File "C:\Users\Hassan\AppData\Local\Programs\Python\Python36\lib\site-packages\flask\_compat.py", line 33, in reraise
raise value
File "C:\Users\Hassan\AppData\Local\Programs\Python\Python36\lib\site-packages\flask\app.py", line 1982, in wsgi_app
response = self.full_dispatch_request()
File "C:\Users\Hassan\AppData\Local\Programs\Python\Python36\lib\site-packages\flask\app.py", line 1614, in full_dispatch_request
rv = self.handle_user_exception(e)
File "C:\Users\Hassan\AppData\Local\Programs\Python\Python36\lib\site-packages\flask\app.py", line 1517, in handle_user_exception
reraise(exc_type, exc_value, tb)
File "C:\Users\Hassan\AppData\Local\Programs\Python\Python36\lib\site-packages\flask\_compat.py", line 33, in reraise
raise value
File "C:\Users\Hassan\AppData\Local\Programs\Python\Python36\lib\site-packages\flask\app.py", line 1612, in full_dispatch_request
rv = self.dispatch_request()
File "C:\Users\Hassan\AppData\Local\Programs\Python\Python36\lib\site-packages\flask\app.py", line 1598, in dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File "E:\Python\manager\views.py", line 37, in add_account
return render_template('add_account.html', form=form)
File "C:\Users\Hassan\AppData\Local\Programs\Python\Python36\lib\site-packages\flask\templating.py", line 134, in render_template
context, ctx.app)
File "C:\Users\Hassan\AppData\Local\Programs\Python\Python36\lib\site-packages\flask\templating.py", line 116, in _render
rv = template.render(context)
File "C:\Users\Hassan\AppData\Local\Programs\Python\Python36\lib\site-packages\jinja2\asyncsupport.py", line 76, in render
return original_render(self, *args, **kwargs)
File "C:\Users\Hassan\AppData\Local\Programs\Python\Python36\lib\site-packages\jinja2\environment.py", line 1008, in render
return self.environment.handle_exception(exc_info, True)
File "C:\Users\Hassan\AppData\Local\Programs\Python\Python36\lib\site-packages\jinja2\environment.py", line 780, in handle_exception
reraise(exc_type, exc_value, tb)
File "C:\Users\Hassan\AppData\Local\Programs\Python\Python36\lib\site-packages\jinja2\_compat.py", line 37, in reraise
raise value.with_traceback(tb)
File "E:\Python\manager\templates\add_account.html", line 1, in top-level template code
{% extends 'layout.html' %}
File "E:\Python\manager\templates\layout.html", line 22, in top-level template code
{% block body %}{% endblock %}
File "E:\Python\manager\templates\add_account.html", line 10, in block "body"
{{render_field(form.username, class_='form-control')}}
jinja2.exceptions.UndefinedError: 'render_field' is undefined
答案 0 :(得分：1)
为什么你认为render_field功能？有关此的任何参考，您正在阅读哪些文档？无论如何，这应该可以解决问题：
{% extends 'layout.html' %}
{% block body %}
<br>
<div class="jumbotron text-center">
<h1>Add an Account</h1>
<hr>
<form action="{{url_for('add_account')}}">
<div class="form-group">
{{form.username(class_='form-control')}}
</div>
<div class="form-group">
{{form.email(class_='form-control')}}
</div>
<div class="form-group">
{{form.password(class_='form-control')}}
</div>
<div class="form-group">
{{form.karma(class_='form-control')}}
</div>
</form>
</div>
{% endblock %}
答案 1 :(得分：1)
{% from '_formhelpers.html' import render_field %}
答案 2 :(得分：0)
您可能会创建一个新文件，名为_formhelpers.html，内容为
{% macro render_field(field) %}
<dt>{{ field.label }}
<dd>{{ field(**kwargs)|safe }}
{% if field.errors %}
<ul class=errors>
{% for error in field.errors %}
<li>{{ error }}</li>
{% endfor %}
</ul>
{% endif %}
</dd>
{% endmacro %}
然后，在将表单加载到VIEW之前添加相同的内容
{% block body %}
<h1>Register </h1>
{% from '/includes/_formhelpers.html' import render_field %}
<form method="POST" action="">
<div class="form-group">
{{render_field(form.name ,class_="form-control")}}
</div>
<p><input type="submit" class="btn btn-primary" value="Submit"></p>
</form>
这应该可以为您解决问题。谢谢！
可以找到文档here
答案 3 :(得分：-2)
您必须使用此代码：
[
{
'adress': {
'city': 'riga',
'country': 'latvia'
},
'org': {
'iden': {
'account': 'account123',
'id': 'id123'
}
},
'person': {
'birthYear': 1990,
'gender': 'female',
'name': {
'fullname': 'laura'
}
},
'subs': {
'id': 'subs123',
'org': {
'buyer': {
'email': {
'address': 'email1@myorg.com|email2@sanoma.com'
},
'phone': {
'number': 371401234567
}
}
},
'subs1': {
'birthday': '1990-12-14T00:00:00Z',
'org': {
'address': {
'country': 'latvia',
'strret1': 'street 1'
}
}
}
}
},
{
'adress': {
'city': 'riga',
'country': 'latvia'
},
'org': {
'iden': {
'account': 'account123',
'id': 'id000'
}
},
'person': {
'birthYear': 1990,
'gender': 'female',
'name': {
'fullname': 'laura'
}
},
'subs': {
'id': 'subs456',
'org': {
'buyer': {
'email': {
'address': 'email1@myorg.com'
},
'phone': {
'number': 371407654321
}
}
},
'subs1': {
'birthday': '1990-12-14T00:00:00Z',
'org': {
'address': {
'country': 'latvia',
'strret1': 'street 1'
}
}
}
}
},
{
'adress': {
'city': 'riga',
'country': 'latvia'
},
'org': {
'iden': {
'account': 'account123',
'id': 'id456'
}
},
'person': {
'birthYear': 1990,
'gender': 'female',
'name': {
'fullname': 'laura'
}
},
'subs': {
'id': 'subs789',
'org': {
'buyer': {
'email': {
'address': 'email1@myorg.com'
},
'phone': {
'number': 371407654321
}
}
},
'subs1': {
'birthday': '1990-12-14T00:00:00Z',
'org': {
'address': {
'country': 'latvia',
'strret1': 'street 1'
}
}
}
}
}
]
用于模板文件。
或者您可以包含 _fromhelpers.html。