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我想使用flask、WTForm 和flask_sqlalchemy 建立一个网站。有一个网页供用户通过WTForm提交信息，现在我想创建另一个页面来显示数据库中的所有数据。我想使用WTForm来做到这一点。在一本书中，示例如下：

def GetSchoolFormById(school_id):
    school = orm.School.query.get(int(school_id))
    if school is None:
        return None
    schoolform = SchoolForm()
    schoolform.id.data = school.id
    schoolform.name.data = school.name
    schoolform.area_id.data = school.area_id
    schoolform.area_name = school.area.name
    schoolform.teachdesc.data = school.teachdesc
    schoolform.address.data = school.address
    schoolform.schooltype_id.data = school.schooltype_id
    schoolform.schooltype_name = school.schooltype.name
    schoolform.website.data = school.website
    schoolform.distinguish.data = school.distinguish
    schoolform.leisure.data = school.leisure
    schoolform.threashold.data = school.threashold
    schoolform.partner.data = school.partner
    schoolform.artsource.data = school.artsource
    schoolform.feedesc.data = school.feedesc
    schoolform.longitude.data = school.longitude
    schoolform.latitude.data = school.latitude
    schoolform.schoolimages = school.schoolimages
    schoolform.feature_ids.data = [x.feature_id for x in school.schoolfeatures]

    schoolform.area_id.choices = g_choices_area
    schoolform.schooltype_id.choices = g_choices_schooltype
    schoolform.feature_ids.choices = g_choices_feature
    return schoolform

但就我而言，我使用了 FieldList，所以我不知道如何像示例一样添加数据。

class ProjectForm(FlaskForm):
    project_id = HiddenField('项目ID')
    project_name = StringField('工程名称')
    project_ST = DateField('起始时间', format='%Y-%m-%d')
    project_FT = DateField('截止时间', format='%Y-%m-%d')


class ItemsForm(Form):
    item_id = HiddenField('事件ID')
    item_name = StringField('事件名称')
    pre_item = SelectMultipleField('前驱事件')
    # 暂定为string类型，加到date的%d里，具体我也不会，实现不了可以再改
    last_time = StringField('持续时间')


class MainForm(FlaskForm):
    items = FieldList(
        FormField(ItemsForm)
    )

@app.route('/view_items', methods=['GET', 'POST'])
def view_items():
    form_one = ProjectForm()
    form_two = MainForm()
    if request.method == 'GET':
        project = DBProject.query.filter_by(project_id=1).first().__dict__
        print(project)
        # 由于目前只有一个project，所以直接导入全部items数据
        items = list(DBItem.query.filter().all())

        form_one.project_id.data = project['project_id']
        form_one.project_name.data = project['project_name']
        form_one.project_ST.data = project['project_ST']
        form_one.project_FT.data = project['project_FT']

        for item in items:
            print(item)
            form_two.items.append_entry(ItemsForm(item))
    return render_template('view_items.html', form_one=form_one, form_two=form_two)

当我测试我的代码时，从底部开始的第二行有一个错误，如下所示：</p> 

TypeError: formdata should be a multidict-type wrapper that supports the 'getlist' method

我该如何处理？我应该使用其他方法将数据传递到 html 页面而不是 WTForm 吗？

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1 回答 1

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WTForms 表单的 __init__ 方法的参数如下__init__(formdata=None, obj=None, prefix='', data=None, meta=None, **kwargs)。您将 Sqlalchemy 对象作为 formdata 参数传递，该参数旨在接收通过 http post 作为 Werkzeug Multidict 发送的用户表单数据。如果您将对象作为 obj 参数传递，那么只要数据库列名称与表单字段名称匹配，它就应该工作。您还可以使用此技术来初始化您的 ProjectForm，而不是依次为每个字段设置数据。

project = DBProject.query.filter_by(project_id=1).first()
form_one = ProjectForm(obj=project)

items = list(DBItem.query.filter().all())
for item in items:
    form_two.items.append_entry(ItemsForm(obj=item))
于 2019-11-26T23:03:05.140 回答