如何使用Flask-WTForms以DRY方式创建重复的表单元素? [英] How can I create repetitive form elements in a DRY way with Flask-WTForms?

问题描述

我有一个WTForms表单，我希望用户能够上传最多10张图像，并提供图像标题和字幕.目前，我声明了所有10组字段，但这似乎是多余的.有没有一种方法可以使用动态名称创建表单字段，所以我可以循环创建它们?

I have a WTForms form where I want the user to be able to upload up to 10 images, and also give the images captions and credits. Currently I declare all 10 sets of fields, but this seems redundant. Is there a way to create form fields with dynamic names, so I could create them in a loop?

class MyForm(Form):
    image1 = FileField('Upload')
    image1_caption = StringField('Caption')
    image1_credit = StringField('Credit')
    image2 = FileField('Upload')
    image2_caption = StringField('Caption')
    image2_credit = StringField('Credit')
    # ...through 10 images...

推荐答案

通过结合 FieldList :

You can get what you're looking for by combining FormField with FieldList:

class ImageForm(Form):
    image = FileField('Upload')
    caption = StringField('Caption')
    credit = StringField('Credit')

class MyForm(Form):
    images = FieldList(FormField(ImageForm), min_entries=10)

然后您可以通过my_form_instance.images.entries或遍历my_form_instance.images来访问各个ImageForm实例:

You can then access the individual ImageForm instances either through my_form_instance.images.entries or by iterating over my_form_instance.images:

for image in my_form_instance.images:
    print(image.data['caption'], image.data['credit'])

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