how do I access model fields individually?

su开发者_C百科ppose I have this model:

id = models.AutoField(primary_key=True)  
datetime_from = models.DateTimeField('time')

model = MyModel
def read(self, request, id=0):
    if not id:
        id = 0        
 MyModel.object 
    mmodel = MyModel.objects.filter(id__gt=id)
    return mmodel

My question is, how do I possible get the model fields individually, because I need to validate the datetime_from before I have to output the data on json format

---

You don't need to create an id column yourself. The read method is not necessary, either. Just say

from django.db import models

class MyModel(models.Model):
    datetime_from = models.DateTimeField('time')

You can then query the table like so

>>> obj = MyModel.objects.get(id=<target id here>)
>>> date = obj.datetime_from
etc.