Serialization of django

Serialization Django main application on a database in the retrieved data back to the client user, a special request is typically returned to Ajax Json format.

Our data format extracted from the database, there are three: 1, all () returns QuerySet object; 2, values ​​() returns the type QuerySet object dictionary; 3, vlaues_list () QuerySet object tuples returned

1, 2 and 3 kinds may be transmitted to the front end by the rear end json.dumps ().

****** rear end of the object acquired quesyset ******* 
Import JSON 
RET = models.BookType.objects.all (). Values ( ' Caption ' ) 
RET = models.BookType.objects.all (). values_list ( ' Caption ' ) 
RET = List (RET) 
Result = json.dumps (RET)
 ******* distal ajax ****** 
distal ajax received data JSON.parse (data) to the rear end converting data transfer quesyset

2, for Case 1: QuerySet need serializers acquired serialize objects can be passed to a front end converter

Extracting data from a database back-end ******* *********
 from django.core Import serializers 
RET = models.BookType.objects.all () 
Data = serializers.serialize ( " JSON " , RET ) # Note serializers only to serialize objects QuerySet conversion 
******* front end of the data obtained by converting JSON.parse (data)

Can not be processed due date datetime json.dumps, the processor can be done by custom extensions, such as: Import JSON 

from datetime import date 
from datetime import datetime 
   
class JsonCustomEncoder(json.JSONEncoder): 
    
    def default(self, field): 
     
        if isinstance(field, datetime): 
            return o.strftime('%Y-%m-%d %H:%M:%S') 
        elif isinstance(field, date): 
            return o.strftime('%Y-%m-%d') 
        else: 
            return json.JSONEncoder.default(self, field) 
   
 d=datetime.now()
ds = Usage json.dunmps json.dumps (d, cls = JsonCustomEncoder ) # call the base class 

step equivalent to:

a=datetime.now()
cls=JsonCustomEncoder()
d=cls.default(a)
ds = json.dumps(d)