insert json data into MySQL database - django

Question

1.I want to save data from database(mysql) to .json file format.
Models.py
class Author(models.Model):
author_id = models.AutoField(primary_key=True)
first_name = models.CharField(max_length=30)
last_name = models.CharField(max_length=40)
email = models.EmailField()
age=models.IntegerField()
class Meta:
db_table=u'Author'
def __unicode__(self):
return u"%d %s %s %s %d" % (self.pk, self.first_name, self.last_name, self.email,self.age)
class Book(models.Model):
book_id=models.AutoField(primary_key=True,unique=True)
book_name=models.CharField(max_length=30)
publisher_name=models.CharField(max_length=40)
author=models.ForeignKey(Author)
class Meta:
db_table = u'Book'
def __unicode__(self):
return u'%d %s %s' % (self.pk, self.book_name, self.publisher_name)
views.py is
def addbook(request):
log.debug("test....")
if request.POST:
first_name = request.POST.get('first_name')
last_name = request.POST.get('last_name')
email = request.POST.get('email')
age = request.POST.get('age')
author = Author(first_name = first_name,last_name = last_name,email=email,age=age)
author.save()
book_name = request.POST.get('book_name')
publisher_name = request.POST.get('publisher_name')
author_info = Author.objects.latest('author_id')
log.debug("test:%s",author_info.author_id)
book=Book(book_name=book_name,publisher_name=publisher_name,author_id=author_info.author_id)
book.save()
return redirect('/index/')
else:
return render_to_response('addbook.html',context_instance=RequestContext(request))
1) In views.py an addbook function is used to add the related data to database.
2) I have to store the database content to a json file after each entry.
3) Can i get help to code the same.

Answer 1

This link explains how to serialize Django models. You will have to add something like this to your model code:
from django.core import serializers
class Book(models.Model):
...
def serialize(self):
JSONSerializer = serializers.get_serializer("json")
json_serializer = JSONSerializer()
with open("/path/to/file/file.json", "w") as out:
json_serializer.serialize([self], stream=out)
The square brackets around [self] are important if you want to serialize a particular instance of a model. If you are serializing a queryset then you can pass that in instead.