python: error while using strptime and timedelta

StackOverflow https://stackoverflow.com/questions/22121648

Question

I'am trying to calculate a due date. Here's the code:

 from datetime import datetime,timedelta

 commande = self.pool.get('commandes').browse(cr, uid,commande_id,context=context)
 date_commande= datetime.strptime(commande.date_commande, "%Y-%m-%d").date()
 res['due_date']=date_commande+timedelta(days=20)

the field due_date is date type

I get this error:

XmlHttpRequestError INTERNAL SERVER ERROR
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
<title>500 Internal Server Error</title>
<h1>Internal Server Error</h1>
<p>The server encountered an internal error and was unable to complete your request.    Either the server is overloaded or there is an error in the application.</p>

I tested the code without timedelta and i still got the same error

the traceback:

Traceback (most recent call last):
  File "werkzeug\serving.py", line 159, in run_wsgi    
  File "werkzeug\serving.py", line 146, in execute    
  File "C:\Program Files (x86)\OpenERP 7.0-20140120-002508\Server\server\openerp\service\wsgi_server.py", line 417, in application
    return application_unproxied(environ, start_response)
  File "C:\Program Files (x86)\OpenERP 7.0-20140120-002508\Server\server\openerp\service\wsgi_server.py", line 403, in application_unproxied
    result = handler(environ, start_response)
  File "C:\Program Files (x86)\OpenERP 7.0-20140120-002508\Server\server\openerp\addons\web\http.py", line 528, in __call__
    return self.dispatch(environ, start_response)
  File "C:\Program Files (x86)\OpenERP 7.0-20140120-002508\Server\server\openerp\addons\web\http.py", line 487, in __call__
    return self.app(environ, start_wrapped)
  File "werkzeug\wsgi.py", line 411, in __call__    
  File "C:\Program Files (x86)\OpenERP 7.0-20140120-002508\Server\server\openerp\addons\web\http.py", line 487, in __call__
    return self.app(environ, start_wrapped)
  File "werkzeug\wsgi.py", line 411, in __call__    
  File "C:\Program Files (x86)\OpenERP 7.0-20140120-002508\Server\server\openerp\addons\web\http.py", line 487, in __call__
    return self.app(environ, start_wrapped)
  File "werkzeug\wsgi.py", line 411, in __call__    
  File "C:\Program Files (x86)\OpenERP 7.0-20140120-002508\Server\server\openerp\addons\web\http.py", line 553, in dispatch
    result = handler(request)
  File "C:\Program Files (x86)\OpenERP 7.0-20140120-002508\Server\server\openerp\addons\web\http.py", line 618, in <lambda>
    return lambda request: JsonRequest(request).dispatch(method)
  File "C:\Program Files (x86)\OpenERP 7.0-20140120-002508\Server\server\openerp\addons\web\http.py", line 251, in dispatch
    body = simplejson.dumps(response)
  File "simplejson\__init__.py", line 286, in dumps    
  File "simplejson\encoder.py", line 228, in encode    
  File "simplejson\encoder.py", line 515, in _iterencode    
  File "simplejson\encoder.py", line 483, in _iterencode_dict    
  File "simplejson\encoder.py", line 483, in _iterencode_dict    
  File "simplejson\encoder.py", line 483, in _iterencode_dict    
  File "simplejson\encoder.py", line 525, in _iterencode    
  File "simplejson\encoder.py", line 202, in default    
TypeError: datetime.date(2014, 3, 3) is not JSON serializable

Please can someone tell me where i made a mistake? Thanks

Was it helpful?

Solution

Your problem in the response encoding to JSON as it can't parse datetime(date) to JSON, you should convert it to string using strftime function.

so you can try:

from datetime import datetime,timedelta

 commande = self.pool.get('commandes').browse(cr, uid,commande_id,context=context)
 date_commande= datetime.strptime(commande.date_commande, "%Y-%m-%d").date()
 res['due_date']= datetime.strftime(date_commande+timedelta(days=20),"%Y-%m-%d")
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