[英]Flask jsonify returns weird array?
I'm trying to create a simple API using Flask. 我正在尝试使用Flask创建一个简单的API。 I now want to return a list of dicts as follows: 我现在想要返回一个dicts列表如下:
print results # prints out [{'date': '2014-09-25 19:00:00', 'title': u'Some Title'}]
response = make_response(jsonify(results))
response.headers['Content-Type'] = 'application/json'
return response
But when I go the the url in the browser, I get the following: 但是当我在浏览器中访问网址时,我得到以下信息:
{
"date": "title"
}
Does anybody know what I'm doing wrong here? 有谁知道我在这里做错了什么? All tips are welcome! 欢迎所有提示!
This is only an issue for Flask versions before 0.11 ; 对于0.11之前的 Flask版本,这只是一个问题; if you still see this problem the best thing to do is to upgrade to a later version , as 0.10 is quite ancient by now. 如果你仍然看到这个问题,最好的办法是升级到更高版本 ,因为0.10现在已经非常古老了。
For Flask up to version 0.10, jsonify()
will only accept dictionaries . 对于最高版本0.10的Flask, jsonify()
只接受字典 。 If you give it a list, it'll turn the object into a dictionary, with dict(argument)
. 如果你给它一个列表,它会把对象变成一个字典,用dict(argument)
。 See the Flask.jsonify()
documentation : 请参阅Flask.jsonify()
文档 :
Creates a
Response
with the JSON representation of the given arguments with anapplication/json
mimetype. 使用application/json
mimetype创建具有给定参数的JSON表示的Response
。 The arguments to this function are the same as to the dict constructor. 此函数的参数与dict构造函数的参数相同。
(Emphasis mine) (强调我的)
In your case you have a list with one element, and that element, when iterated over, has 2 values. 在您的情况下,您有一个包含一个元素的列表,并且该元素在迭代时具有2个值。 Those two values then become the key and value of the output dictionary: 这两个值然后成为输出字典的键和值:
>>> results = [{'date': '2014-09-25 19:00:00', 'title': u'Some Title'}]
>>> dict(results)
{'date': 'title'}
That's because the dict()
constructor either takes another dictionary, keyword arguments or an iterable of (key, value)
pairs. 那是因为dict()
构造函数要么使用另一个字典,关键字参数, 要么使用(key, value)
对的迭代。
The solution is to not pass in a list, but give it, at the very least, a key: 解决方案是不传入列表,但至少给它一个键:
response = jsonify(results=results)
jsonify()
already returns a response object, there is no need to call make_response()
on it. jsonify()
已经返回一个响应对象,不需要在其上调用make_response()
。 The above produces a JSON object with a 'results'
key and your list as the value. 上面会生成一个带有'results'
键的JSON对象,并将您的列表作为值。
jsonify()
only takes a dictionary for security reasons. 出于安全原因, jsonify()
只接受字典。 Quoting the documentation again: 再次引用文档:
For security reasons only objects are supported toplevel. 出于安全原因,仅支持对象。 For more information about this, have a look at JSON Security . 有关此内容的更多信息,请查看JSON安全性 。
If you really want to bypass this, you'll have to create your own response: 如果你真的想绕过这个,你必须创建自己的回复:
from Flask import json
response = make_response(json.dumps(results), mimetype='application/json')
This should no longer be an issue now that Flask's jsonify()
method serializes top-level arrays (as of this commit ). 现在,Flask的jsonify()
方法序列化顶级数组(截至此提交时 ),这应该不再是问题。
You'll need to be on Flask >= 0.11. 你需要在Flask上> = 0.11。
For convenience, you can either pass in a Python list: jsonify([1,2,3])
Or pass in a series of args
: jsonify(1,2,3)
为方便起见,您可以传入Python列表: jsonify([1,2,3])
或传入一系列args
: jsonify(1,2,3)
Both will be converted to: [1,2,3]
两者都将转换为: [1,2,3]
Details here: http://flask.pocoo.org/docs/dev/api/#flask.json.jsonify 详情请访问: http : //flask.pocoo.org/docs/dev/api/#flask.json.jsonify
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