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

Question

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？

Answer 1

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