Why serializing to JSON doesn't work?
Hello,
I've got the code like this:
from django.core import serializers
...
ret = { }
ret['a'] = 'b'
json_serializer = serializers.get_serializer("json")()
serialized = json_serializer.serialize(ret, ensure_ascii=False)
print serialized
and this doesn't print serialized. What do I do wrong ?
I'm using Python 2.5.2, Django 1.0.2.
Thanks in advance,
Marek
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Re: Why serializing to JSON doesn't work?
The serializers are for serializing querysets/models. I'm surprised
you're not getting an error message there--are you catching all
exceptions?
What you want is in django.utils.simplejson:
from django.utils.simplejson import encoder
encoder.JSONEncoder().encode(ret)
-Jeff
On Mar 4, 6:55 pm, Marek Wawrzyczek wrote:
> Hello,
>
> I've got the code like this:
>
> from django.core import serializers
> ...
>
> ret = { }
> ret['a'] = 'b'
> json_serializer = serializers.get_serializer("json")()
> serialized = json_serializer.serialize(ret, ensure_ascii=False)
> print serialized
>
> and this doesn't print serialized. What do I do wrong ?
> I'm using Python 2.5.2, Django 1.0.2.
>
> Thanks in advance,
> Marek
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Re: Why serializing to JSON doesn't work?
Jeff FW schrieb: > The serializers are for serializing querysets/models. I'm surprised > you're not getting an error message there--are you catching all > exceptions? > > What you want is in django.utils.simplejson: > > from django.utils.simplejson import encoder > encoder.JSONEncoder().encode(ret) Or this: >>> from django.utils import simplejson >>> simplejson.dumps(...) But unfortunately this does not encode datetime objects. Thomas -- Thomas Guettler, http://www.thomas-guettler.de/ E-Mail: guettli (*) thomas-guettler + de --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-users@googlegroups.com To unsubscribe from this group, send email to django-users+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/django-users?hl=en -~--~~~~--~~--~--~---
Re: Why serializing to JSON doesn't work?
Thomas Guettler wrote:
>
> Jeff FW schrieb:
>
>> The serializers are for serializing querysets/models. I'm surprised
>> you're not getting an error message there--are you catching all
>> exceptions?
>>
>> What you want is in django.utils.simplejson:
>>
>> from django.utils.simplejson import encoder
>> encoder.JSONEncoder().encode(ret)
>>
>
> Or this:
>
>
from django.utils import simplejson
simplejson.dumps(...)
>
> But unfortunately this does not encode datetime objects.
>
> Thomas
>
>
>
Thanks for your responses. Now when I try
ret = { }
ret['a'] = 'b'
serialized = encoder.JSONEncoder().encode(ret)
print serialized
then It works.
But now I have another problem. I have a class "State":
class State(models.Model):
state = models.CharField(max_length = 30)
def __unicode__(self):
return self.state
Throutht the admin page I create a state called "Slaskie".
Then the code :
ret['b'] = State.objects.all()
print 'ret: %' % ret
try:
serialized = encoder.JSONEncoder().encode(ret)
except Exception, e:
print 'exception: %s' % e
returns the output:
{'b': []}
[] is not JSON serializable
At the page
http://docs.djangoproject.com/en/dev/topics/serialization/#id2 there's
written something about unicode and lazy translation. I tried to use
le = LazyEncoder() #lazy encoder is a given class from the
link above
serialized = le.encode(ret)
and then the exception was:
Circular reference detected
when I tried
le = LazyEncoder (ensure_ascii = False)
the exception was the same:
Circular reference detected
What's going on with this lazy translation and unicode ? How can I
serialize the data correctly ?
Regards,
Marek
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Re: Why serializing to JSON doesn't work?
You know what's weird? I've used simplejson.dumps() plenty of times
in my own code... not sure why that one just slipped out of my
memory. I should just stop responding to things :-)
Anyway, since you're serializing a model, you *should* be using your
originally posted method. Use the way Marek said for anything other
than models (of course, the object has to be serializable.)
If that doesn't work, post the full (relevant) code.
-Jeff
On Mar 5, 7:01 am, Marek Wawrzyczek wrote:
> Thomas Guettler wrote:
>
> > Jeff FW schrieb:
>
> >> The serializers are for serializing querysets/models. I'm surprised
> >> you're not getting an error message there--are you catching all
> >> exceptions?
>
> >> What you want is in django.utils.simplejson:
>
> >> from django.utils.simplejson import encoder
> >> encoder.JSONEncoder().encode(ret)
>
> > Or this:
>
> from django.utils import simplejson
> simplejson.dumps(...)
>
> > But unfortunately this does not encode datetime objects.
>
> > Thomas
>
> Thanks for your responses. Now when I try
>
> ret = { }
> ret['a'] = 'b'
> serialized = encoder.JSONEncoder().encode(ret)
> print serialized
>
> then It works.
>
> But now I have another problem. I have a class "State":
>
> class State(models.Model):
> state = models.CharField(max_length = 30)
>
> def __unicode__(self):
> return self.state
>
> Throutht the admin page I create a state called "Slaskie".
> Then the code :
>
> ret['b'] = State.objects.all()
> print 'ret: %' % ret
> try:
> serialized = encoder.JSONEncoder().encode(ret)
> except Exception, e:
> print 'exception: %s' % e
>
> returns the output:
>
> {'b': []}
> [] is not JSON serializable
>
> At the
> pagehttp://docs.djangoproject.com/en/dev/topics/serialization/#id2there's
> written something about unicode and lazy translation. I tried to use
>
> le = LazyEncoder() #lazy encoder is a given class from the
> link above
> serialized = le.encode(ret)
>
> and then the exception was:
> Circular reference detected
>
> when I tried
>
> le = LazyEncoder (ensure_ascii = False)
>
> the exception was the same:
> Circular reference detected
>
> What's going on with this lazy translation and unicode ? How can I
> serialize the data correctly ?
>
> Regards,
> Marek
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Re: Why serializing to JSON doesn't work?
Thanks for your responses, they helped :)
In the code below:
ret['b'] = State.objects.all()
print 'ret: %' % ret
try:
serialized = encoder.JSONEncoder().encode(ret)
except Exception, e:
print 'exception: %s' % e
I was doing the following mistake - I wanted to serialize query set in a
dictionary directly, and the exception was thrown, I think because
encoder.JSONEncoder() can't encode a QuerySet.
While using code like this:
ret = State.objects.all()
json_serializer = serializers.get_serializer("json")()
serialized_model = json_serializer.serialize(ret, ensure_ascii = False)
ret_val['b'] = serialized_model
serialized = encoder.JSONEncoder().encode(ret_val)
then it doesn't throw exception, but code above just creates a
serialized dicionary of serialized model, so when I try to decode it
with JSON parser on a page, i get a dictionary of strings. I can create
a JSON response manually by:
serialized = '{"b":%s}'% serialized_model
but it's a little annoying while serializing a few models.
Is there any way to serialize dictionary of QuerySets without creating
json response manually?
Regards,
Marek
> You know what's weird? I've used simplejson.dumps() plenty of times
> in my own code... not sure why that one just slipped out of my
> memory. I should just stop responding to things :-)
>
> Anyway, since you're serializing a model, you *should* be using your
> originally posted method. Use the way Marek said for anything other
> than models (of course, the object has to be serializable.)
>
> If that doesn't work, post the full (relevant) code.
>
> -Jeff
>
> On Mar 5, 7:01 am, Marek Wawrzyczek wrote:
>
>> > Thomas Guettler wrote:
>> >
>>
>>> > > Jeff FW schrieb:
>>>
>> >
>>
> >> The serializers are for serializing querysets/models. I'm surprised
> >> you're not getting an error message there--are you catching all
> >> exceptions?
>> >
>>
> >> What you want is in django.utils.simplejson:
>> >
>>
> >> from django.utils.simplejson import encoder
> >> encoder.JSONEncoder().encode(ret)
>> >
>>
>>> > > Or this:
>>>
>> >
>>
>> > from django.utils import simplejson
>> > simplejson.dumps(...)
>>
>> >
>>
>>> > > But unfortunately this does not encode datetime objects.
>>>
>> >
>>
>>> > > Thomas
>>>
>> >
>> > Thanks for your responses. Now when I try
>> >
>> > ret = { }
>> > ret['a'] = 'b'
>> > serialized = encoder.JSONEncoder().encode(ret)
>> > print serialized
>> >
>> > then It works.
>> >
>> > But now I have another problem. I have a class "State":
>> >
>> > class State(models.Model):
>> > state = models.CharField(max_length = 30)
>> >
>> > def __unicode__(self):
>> > return self.state
>> >
>> > Throutht the admin page I create a state called "Slaskie".
>> > Then the code :
>> >
>> > ret['b'] = State.objects.all()
>> > print 'ret: %' % ret
>> > try:
>> > serialized = encoder.JSONEncoder().encode(ret)
>> > except Exception, e:
>> > print 'exception: %s' % e
>> >
>> > returns the output:
>> >
>> > {'b': []}
>> > [] is not JSON serializable
>> >
>> > At the
>> > pagehttp://docs.djangoproject.com/en/dev/topics/serialization/#id2there's
>> > written something about unicode and lazy translation. I tried to use
>> >
>> > le = LazyEncoder() #lazy encoder is a given class from the
>> > link above
>> > serialized = le.encode(ret)
>> >
>> > and then the exception was:
>> > Circular reference detected
>> >
>> > when I tried
>> >
>> > le = LazyEncoder (ensure_ascii = False)
>> >
>> > the exception was the same:
>> > Circular reference detected
>> >
>> > What's going on with this lazy translation and unicode ? How can I
>> > serialize the data correctly ?
>> >
>> > Regards,
>> > Marek
>>
> >
>
>
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Re: Why serializing to JSON doesn't work?
Keep the way you're serializing the querysets, add each one to a
dictionary, and then:
return dict((k, simplejson.dumps(v)) for k, v in ret_val.iteritems())
-Jeff
On Mar 6, 10:49 am, Marek Wawrzyczek wrote:
> Thanks for your responses, they helped :)
>
> In the code below:
>
> ret['b'] = State.objects.all()
> print 'ret: %' % ret
> try:
> serialized = encoder.JSONEncoder().encode(ret)
> except Exception, e:
> print 'exception: %s' % e
>
> I was doing the following mistake - I wanted to serialize query set in a
> dictionary directly, and the exception was thrown, I think because
> encoder.JSONEncoder() can't encode a QuerySet.
>
> While using code like this:
>
> ret = State.objects.all()
> json_serializer = serializers.get_serializer("json")()
> serialized_model = json_serializer.serialize(ret, ensure_ascii =
> False)
> ret_val['b'] = serialized_model
> serialized = encoder.JSONEncoder().encode(ret_val)
>
> then it doesn't throw exception, but code above just creates a
> serialized dicionary of serialized model, so when I try to decode it
> with JSON parser on a page, i get a dictionary of strings. I can create
> a JSON response manually by:
>
> serialized = '{"b":%s}'% serialized_model
>
> but it's a little annoying while serializing a few models.
>
> Is there any way to serialize dictionary of QuerySets without creating
> json response manually?
>
> Regards,
> Marek
>
> > You know what's weird? I've used simplejson.dumps() plenty of times
> > in my own code... not sure why that one just slipped out of my
> > memory. I should just stop responding to things :-)
>
> > Anyway, since you're serializing a model, you *should* be using your
> > originally posted method. Use the way Marek said for anything other
> > than models (of course, the object has to be serializable.)
>
> > If that doesn't work, post the full (relevant) code.
>
> > -Jeff
>
> > On Mar 5, 7:01 am, Marek Wawrzyczek wrote:
>
> >> > Thomas Guettler wrote:
>
> >>> > > Jeff FW schrieb:
>
> > >> The serializers are for serializing querysets/models. I'm surprised
> > >> you're not getting an error message there--are you catching all
> > >> exceptions?
>
> > >> What you want is in django.utils.simplejson:
>
> > >> from django.utils.simplejson import encoder
> > >> encoder.JSONEncoder().encode(ret)
>
> >>> > > Or this:
>
> >> > from django.utils import simplejson
> >> > simplejson.dumps(...)
>
> >>> > > But unfortunately this does not encode datetime objects.
>
> >>> > > Thomas
>
> >> > Thanks for your responses. Now when I try
>
> >> > ret = { }
> >> > ret['a'] = 'b'
> >> > serialized = encoder.JSONEncoder().encode(ret)
> >> > print serialized
>
> >> > then It works.
>
> >> > But now I have another problem. I have a class "State":
>
> >> > class State(models.Model):
> >> > state = models.CharField(max_length = 30)
>
> >> > def __unicode__(self):
> >> > return self.state
>
> >> > Throutht the admin page I create a state called "Slaskie".
> >> > Then the code :
>
> >> > ret['b'] = State.objects.all()
> >> > print 'ret: %' % ret
> >> > try:
> >> > serialized = encoder.JSONEncoder().encode(ret)
> >> > except Exception, e:
> >> > print 'exception: %s' % e
>
> >> > returns the output:
>
> >> > {'b': []}
> >> > [] is not JSON serializable
>
> >> > At the
> >> > pagehttp://docs.djangoproject.com/en/dev/topics/serialization/#id2there's
> >> > written something about unicode and lazy translation. I tried to use
>
> >> > le = LazyEncoder() #lazy encoder is a given class from the
> >> > link above
> >> > serialized = le.encode(ret)
>
> >> > and then the exception was:
> >> > Circular reference detected
>
> >> > when I tried
>
> >> > le = LazyEncoder (ensure_ascii = False)
>
> >> > the exception was the same:
> >> > Circular reference detected
>
> >> > What's going on with this lazy translation and unicode ? How can I
> >> > serialize the data correctly ?
>
> >> > Regards,
> >> > Marek
>
>
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