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POConverting JSON into validated python objects in Tornado?
 

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  1. POConverting JSON into validated python objects in Tornado?
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    <p>I'm writing a toy app in Tornado and <a href="http://namlook.github.com/mongokit/" rel="nofollow">MongoKit</a> (ORM validator for MongoDB) with basic post/get/put/delete methods. For example, this REST API request 'http://localhost:8888/user' with body {"username": "dhh", "datetime_joined": "2012-08-04 20:05:12"} should create a new document in mongo collection. datetime_joined is a string in JSON, but datetime in MongoKit class. Is there a better way to do that than explicitly converting the string into datetime as shown in the code below? It works fine for datetimes in structure (like 'datetime_joined'), but obviously doesn't work for converting nested datetimes (like 'datetime_created' in the example below). Unless you convert strings into datetimes recursively. To sum up, what's a good practice to convert strings which represent dates into datetimes in MongoKit?</p> <p>Here's my example code for reference:</p> <pre><code>def string_to_datetime(value): if value is not None: return datetime.strptime(value, '%Y-%m-%d %H:%M:%S') return None class User(Document): structure = { 'username': basestring, 'datetime_joined': datetime, 'info': { 'email': basestring, 'datetime_created': datetime } } class APIHandler(tornado.web.RequestHandler): SUPPORTED_METHODS = ("GET", "HEAD", "POST", "DELETE", "PATCH", "PUT", "OPTIONS") def initialize(self): self.conn = Connection() self.conn.register([User]) self.clazz = self.conn.User def post(self): service = json.loads(self.request.body) service_document = self.clazz() for key in service: if key.startswith('datetime'): service_document[key] = string_to_datetime(service[key]) else: service_document[key] = service[key] service_document.validate() service_document.save() </code></pre>
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    1. PTQuestion
    1. USArman
    1. USArman
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    1. COTo convert *any* JSON nested structure into a validated python object structure, I'd use [colander](http://docs.pylonsproject.org/projects/colander/en/latest/), but I don't know how that'd play with MongoKit.
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      1. POConverting JSON into validated python objects in Tornado?
      1. USMartijn Pieters
    2. COThanks! I will check it out.
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      1. POConverting JSON into validated python objects in Tornado?
      1. USArman
 

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