python - 如何在 WTForms 中生成动态字段

Question

我正在尝试根据本文档 http://wtforms.simplecodes.com/docs/1.0.2/specific_problems.html#dynamic-form-composition 在 WTForms 中生成具有动态字段的表单

我有这个子表单类，它允许用户从列表中选择要购买的元素:

class Item(Form):
    itmid = SelectField('Item ID')
    qty = IntegerField('Quantity')

class F(Form):
        pass

会有不止一个类别的购物项目，所以我想根据用户将选择的类别生成一个动态选择字段:

fld = FieldList(FormField(Item))
fld.append_entry()

但我收到以下错误:

AttributeError: 'UnboundField' object has no attribute 'append_entry'

是我做错了什么，还是没有办法在 WTForms 中做到这一点？

Answer 1

我今晚遇到了这个问题，最后得到了这个。我希望这对 future 的人有所帮助。

RecipeForm.py

class RecipeForm(Form):
    category = SelectField('Category', choices=[], coerce=int)
    ...

views.py

@mod.route('/recipes/create', methods=['POST'])
def validateRecipe():
    categories = [(c.id, c.name) for c in g.user.categories.order_by(Category.name).all()]
    form = RecipeForm(request.form)
    form.category.choices = categories
    ...

@mod.route('/recipes/create', methods=['GET'])
def createRecipe():
    categories = [(c.id, c.name) for c in g.user.categories.order_by(Category.name).all()]
    form = RecipeForm(request.form)
    form.category.choices = categories
    return render_template('recipes/createRecipe.html', form=form)

我找到了 post也很有帮助