python wtf AttributeError : 'ObjectIdField' object has no attribute 'help_text'

基于 this教程 我正在尝试创建一个表格来进行一些测量。显示数据的部分似乎可以正常工作，但是当使用 model_form 命令生成输入表单时，它会因以下错误而中断:

File "/myproject/lib/python3.4/site-packages/flask_mongoengine/wtf/orm.py", line 49, in convert 'description': field.help_text or '',

AttributeError: 'ObjectIdField' object has no attribute 'help_text'

错误发生在我的代码的这一行:

form_cls = model_form(Measurement, exclude=('id', 'created_at', 'comments')) 

这是我的 view.py 代码:

from flask import Blueprint, request, redirect, render_template, url_for 
from flask.views import MethodView 
from flask.ext.mongoengine.wtf import model_form 
from pyReefLog.models import Measurement 
 
measurements = Blueprint('measurements', __name__, template_folder='templates') 
 
 
class List(MethodView): 
    cls = Measurement 
 
    def get(self): 
        measurements = self.cls.objects.all() 
        return render_template('measurements/list.html', measurements=measurements) 
 
 
class Detail(MethodView): 
 
    def get_context(self, creator=None): 
        form_cls = model_form(Measurement, exclude=('id', 'created_at', 'comments')) 
 
        if creator: 
            measurement = Measurement.objects.get_or_404(creator=creator) 
            if request.method == 'POST': 
                form = form_cls(request.form, inital=measurement._data) 
            else: 
                form = form_cls(obj=measurement) 
        else: 
            measurement = Measurement() 
            form = form_cls(request.form) 
 
        context = { 
            "measurement": measurement, 
            "form": form, 
            "create": creator is None 
        } 
        return context 
 
    def get(self, creator): 
        context = self.get_context(creator) 
        return render_template('measurements/detail.html', **context) 
 
    def post(self, creator): 
        context = self.get_context(creator) 
        form = context.get('form') 
 
        if form.validate(): 
            post = context.get('post') 
            form.populate_obj(post) 
            post.save() 
 
            return redirect(url_for('measurements.index')) 
        return render_template('measurements/detail.html', **context) 
 
 
# Register the urls 
measurements.add_url_rule('/', view_func=List.as_view('index')) 
measurements.add_url_rule('/create/', defaults={'creator': None}, view_func=Detail.as_view('create')) 
measurements.add_url_rule('/<creator>/', view_func=Detail.as_view('edit')) 

这是我的 models.py:

import datetime 
from flask import url_for 
from pyReefLog import db 
 
 
class Comment(db.EmbeddedDocument): 
    created_at = db.DateTimeField(default=datetime.datetime.now, required=True) 
    body = db.StringField(verbose_name="Comment", required=True) 
    author = db.StringField(verbose_name="Name", max_length=255, required=True) 
 
 
class Measurement(db.Document): 
    created_at = db.DateTimeField(default=datetime.datetime.now, required=True) 
    measured_at = db.DateTimeField(default=datetime.datetime.now, required=True) 
    alkalinity = db.DecimalField(default=0.0, precision=2) 
    calcium = db.DecimalField(default=0.0, precision=2) 
    magnesium = db.DecimalField(default=0.0, precision=2) 
    ph = db.DecimalField(default=0.0, precision=2) 
    phosphate = db.DecimalField(default=0.0, precision=2) 
    salinity = db.DecimalField(default=0.0, precision=2) 
    temperature = db.DecimalField(default=0.0, precision=2) 
    creator = db.StringField(required=True, max_length=255) 
    comments = db.ListField(db.EmbeddedDocumentField('Comment')) 
 
    def get_absolute_url(self): 
        return url_for('measurement', kwargs={"creator": self.creator}) 
 
    def __unicode__(self): 
        return self.creator 
 
    meta = { 
        'allow_inheritance': True, 
        'indexes': ['-created_at', '-measured_at', 'creator'], 
        'ordering': ['-measured_at'] 
    } 

wtForms 教程都没有提到任何与 help_text 属性相关的内容。 谁能明白那里出了什么问题？

请您参考如下方法:

编辑:

根据用户 Jérôme 的评论 #2，flask-mongoengine(和 mongoengine 0.10.5)的当前版本(本次编辑时为 0.7.5)开箱即用。经过测试和验证。

我正在做同样的教程，也遇到了那个错误。

我在 models.py 的字段(这些是 StringFields)中添加了 help_text="Your helptext here." 并解决了问题，但是您的错误指向 ObjectIdField，这使它成为更多令人费解。

所以这并不是非常有用，但也许它会在正确的方向上激励您。

编辑:

我为此纠结了一段时间，结果发现 mongoengine 发生了变化，破坏了 flask_mongoengine。 This commit in flask_mongoengine in turn fixes that.

至于实际解决方案，使用以前版本的 mongoengine (0.10.1) 对我有用。所以:

$ pip uninstall mongoengine 
$ pip install mongoengine==0.10.1