在 django 表单中,自定义小部件返回列表作为值而不是字符串

发布于 2024-08-22 12:54:45 字数 1149 浏览 6 评论 0原文

我正在编写一个自定义小部件,我想返回一个列表作为值。根据我可以找到的设置返回的值,您可以创建一个自定义 value_from_datadict 函数。我已经这样做了,

def value_from_datadict(self, data, files, name):
    value = data.get(name, None)
    if value:
        # split the sting up so that we have a list of nodes
        tag_list = value.strip(',').split(',')
        retVal = []
        # loop through nodes
        for node in tag_list:
            # node string should be in the form: node_id-uuid
            strVal = str(node).split("-")

            uuid = strVal[-1]
            node_id = strVal[0]

            # create a tuple of node_id and uuid for node
            retVal.append({'id': node_id, 'uuid': uuid})

        if retVal:
            # if retVal is not empty. i.e. we have a list of nodes
            # return this. if it is empty then just return whatever is in data
            return retVal

    return value

我希望它返回一个列表,但是当我打印出该值时,它会作为字符串而不是列表返回。字符串本身包含正确的文本,但正如我所说,它是一个字符串而不是一个列表。返回内容的一个示例可能是

[{'id': '1625', 'uuid': None}]

,但如果我执行了 str[0] ,它会打印出 [ 而不是 {'id': '1625', 'uuid': None}

我怎样才能阻止它将我的列表转换为字符串?

谢谢

I am writting a custom widget which I want to return a list as the value. From what I can find to set the value that is returned you create a custom value_from_datadict function. I have done this

def value_from_datadict(self, data, files, name):
    value = data.get(name, None)
    if value:
        # split the sting up so that we have a list of nodes
        tag_list = value.strip(',').split(',')
        retVal = []
        # loop through nodes
        for node in tag_list:
            # node string should be in the form: node_id-uuid
            strVal = str(node).split("-")

            uuid = strVal[-1]
            node_id = strVal[0]

            # create a tuple of node_id and uuid for node
            retVal.append({'id': node_id, 'uuid': uuid})

        if retVal:
            # if retVal is not empty. i.e. we have a list of nodes
            # return this. if it is empty then just return whatever is in data
            return retVal

    return value

I expect this to return a list but when I print out the value it is returned as a string rather than a list. The string itself contains the right text but as i said it is a string and not a list. An example of what is returned could be

[{'id': '1625', 'uuid': None}]

but if I did str[0] it would print out [ instead of {'id': '1625', 'uuid': None}

How can I stop it from converting my list into a string?

Thanks

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北恋 2024-08-29 12:54:45

嗯,很简单:如果您有一个 CharField,那么您将得到一个字符串作为结果,因为 CharField 使用方法 to_python,该方法强制结果字符串。您需要为此创建自己的 Field 并返回一个列表。

OLD

您能否发布结果:

x = value_from_datadict(..)
print type(x)

以便我们可以看到,到底返回了什么?

您能否发布您用来提供示例的整个测试用例?

Well, it's simple: if you have a CharField, then you will get a string as a result, because CharField uses method to_python, that coerces the result to string. You need to create your own Field for this one and return a list.

OLD

Could you post the result of:

x = value_from_datadict(..)
print type(x)

so we can see, what exactly is returned?

And could you post the whole test case you are using to deliver the example?

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