python - 使用 Flask 和 Flask-MongoAlchemy 时的 WTForms 语法

Question

我正在使用 MongoDB 测试 Python 框架 Flask 和 Flask-MongoAlchemy(当然)。当我在测试应用程序中构建多个文档时，我希望通过 WTForms 验证表单。

任何人都可以与我分享一个有关如何在 SelectField() 中创建对象引用的示例吗？

class Parent(db.Document):
    title = db.StringField()
    description = db.StringField()

class Object(db.Document):
    parent = db.DocumentField(Parent)
    title = db.StringField()

@app.route('/object/new', methods=['GET', 'POST'])
def new_object():
    form = ObjectForm(obj=Object)
    form.parent.choices = [(???) for p in Parent.query.all()]  #<-- #1 correct syntax I like to understand, '(t._id, t.title)' didn't work.
    if form.validate_on_submit():
        form.save()
        return redirect(url_for('...'))
    return ....

class ObjectForm(wtf.Form):
    parent = wtf.SelectField(u'Parent')  #<-- #2 do I need to add anything special?

任何建议都会很棒!或者链接到在线示例。谢谢!

Answer 1

它记录在WTForms documentation of the SelectField中为了方便起见，在此引用:

Select fields keep a choices property which is a sequence of (value, label) pairs.

我不确定 form.parent.choices 语法，但代码如下所示:

form.parent.choices = [(1, 'parent name 1'), (2, 'parent name 2'), (3, 'parent name 3'), (4, 'parent name 4')]