On Jan 6, 1:54 am, Malcolm MacKinnon <mmack3...@gmail.com> wrote:
> I'm having difficulty deserializing a json object. I'm using django
> appengine patch, so the models aren't the same as django's, but they are
> very similar:
>
> class Cust(db.Model):
> custno = db.StringProperty(required=True)
> company = db.StringProperty(required=True)
> contact = db.StringProperty(required=False)
> address1 = db.StringProperty(required=False)
> address2 = db.StringProperty(required=False)
> city = db.StringProperty(required=True)
> state = db.StringProperty(required=False)
> zipc = db.StringProperty(required=False)
> country = db.StringProperty(required=False)
> phone = db.StringProperty(required=False)
> salesmn = db.StringProperty(required=True)
> email = db.StringProperty()
>
> def __unicode__(self):
> return self.custno + " : " + str(self.company)+" :
> "+str(self.city)+" : "+str(self.state)
Aargh! unicode methods must return unicode! Not bytestrings! Do this:
return u'%s: %s: %s: %s' % (self.custno, self.company, self.city,
self.state)
>
> class Cust_List(db.Model):
> custno = db.StringProperty(required=True)
> companies = db.TextProperty(required=True) #customer list as json object
>
> Note that the json object is stored in the db.TextProperty companies, and is
> composed of more than a 1000 customers, all of which are also individually
> stored in the model, Cust . I query the json object for a customer list,
> since it saves CPU time on the appengine.
>
> Here's what happens when I try to decode the json string object:>>> from
> sport.models import Cust_List
> >>> from django.core import serializers
> >>> a=Cust_List.all()
> >>> b=a.get() #returns the only and only data item in this model, which is a
>
> json object previously stored in the datastore.>>>
> c=serializers.deserialize('json', b.companies)
> >>> d=list(c)
> >>> e=len(d)
> >>> e
> 1057
> >>> b
>
> etc...
> cy...@global.net", "phone": "269/552-0000", "state": "MN", "contact": "Rick
> L
> ee", "salesmn": "O1", "country": "", "address2": ""}}, {"pk": "XBwTAxc
> hELEgpzcG9ydGNUYDA", "model": "sport.cust", "fields": {"city": "GOLD RIVE
> R", "zipc": "95670", "address1": "11282 PYRITES WAY", "company": "ZSPORTS",
> "cus
> tno": "ZSP001", "email": "ra...@zsports.com", "phone": "916/638-0033", "sta
> te": "CA", "contact": "Randy Mintz", "salesmn": "H1", "country": "",
> "address2":
> ""}}]')>>> d
>
> etc...
> <DeserializedObject: WAS160 : WASATCH RUNNING CENTER : SANDY : UT>,
> <Deserializ
> edObject: WAT091 : WATERVILLE VALLEY RESORT : WATERVILLE VALLEY : NH>,
> <Deserial
> izedObject: WES003 : WESTCHESTER ROAD RUNNER : WHITE PLAINS : NY>,
> <Deserialized
> Object: WES100 : WEST HILL SHOP : PUTNEY : VT>, <DeserializedObject: WHE189
> : WH
> EELIE FUN MULTI SPORT : LEBANON : OH>, <DeserializedObject: WHI002 :
> WHIRLAWAY S
> PORTS CTR : METHUEN : MA>, <DeserializedObject: WHI296 : WHITE GRASS SKI
> TOURING
> : DAVIS : WV>, <DeserializedObject: WHI443 : WHISTLER XC SKI & HIKE LTD. :
> WHIS
> TLER, BC : >, <DeserializedObject: WIL490 : WILDERNESS SPORTS : DILLON :
> CO>, <D
> eserializedObject: WIL520 : WILD ROSE MOUNTAIN SPORTS : SALT LAKE CITY :
> UT>, <D
> eserializedObject: WIL659 : ADVENTURE OUTFITTERS : HADLEY : MA>,
> <DeserializedOb
> ject: WIL760 : WILDERNESS WAY, INC : SOLDOTNA : AK>, <DeserializedObject:
> WIL9LA
> : WILSON BACKCOUNTRY : WILSON : WY>, <DeserializedObject: WIL9TM : WILSON
> MOUNT
> AIN SPORTS : LAKE LOUISE, ALBERTA : >, <DeserializedObject: WIL9TQ :
> WILDERNESS
> SPORTS-DILLON : DILLON : CO>, <DeserializedObject: WIN106 : WINTHROP
> MOUNTAIN SP
> ORTS : WINTHROP : WA>, <DeserializedObject: WIN361 : WINTERSTEIGER : SALT
> LAKE C
> ITY : UT>, <DeserializedObject: WOM001 : WOMEN'S SPORTS SPEC. : WILMINGTON :
> DE>
> , <DeserializedObject: WOM016 : WOMEN'S SOURCE FOR SPORTS : SOUTH BURLINGTON
> : V
> T>, <DeserializedObject: WOO155 : WOODSTOCK INN & RESORT : WOODSTOCK : VT>,
> <Des
> erializedObject: WOR059 : WORLD CYCLE : BOISE : ID>, <DeserializedObject:
> YEL017
> : YELLOWSTONE GATEWAY SPORTS : BOZEMAN : MT>, <DeserializedObject: ZAP013 :
> ZAP
> POS.COM : HENDERSON : NV>, <DeserializedObject: ZOM004 : ZOMBIE RUNNER :
> PALO AL
> TO : CA>, <DeserializedObject: ZOO005 : ZOO CITY CYCLE & SPORT : KALAMAZOO :
> MI>
> , <DeserializedObject: ZSP001 : ZSPORTS : GOLD RIVER : CA>] etc.
>
> Note that I just get returned a unicode representation of my model, Cust.
> But the contact information, address information, and so on disappears in
> the deserialized object. Any thoughts on why or what I'm doing wrong?
>
> Thanks for any help or ideas!
>
You're not getting a unicode representation, you're getting a
DeserialzedObject. As the documentation (http://docs.djangoproject.com/
en/1.1/topics/serialization/#deserializing-data) says, you need to
iterate through the list of objects and call save() on each one to
create the actual model.
--
DR.
--
You received this message because you are subscribed to the Google Groups
"Django users" group.
To post to this group, send email to django-us...@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.
