使用Flask和FlaskMongoAlchemy时WTForms语法

Question

我正在用MongoDB测试Python框架Flask和Flask MongoAlchemy（当然）。当我在我的测试应用程序中构建多个文档时，我喜欢让我们验证的表单WTForms。在

有谁能和我分享一个如何在SelectField（）中创建对象引用的例子吗？在

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?

任何建议都太好了！或者链接到一个在线例子。谢谢！在

Answer 1

为了方便起见，这里引用了WTForms documentation of the SelectField中的文档：

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：

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