Question

I want to send image src to browser with AJAX.

Server side:

que = db.Query(Imageitem).order('-created')
item_list = que.fetch(limit=1)
if(len(item_list)>0):
    itemkey = {'imgid':item_list[0].key()}
else:
    itemkey = {'imgid':''}
json_itemkey = gaejsonEncoder.encode(itemkey)

Client side template:

<img src='img?img_id=$(.imgid)'></img>

I use SNBinder for client side binding and $(.imgid) means itemkey[0].imgid.

But this is error.

datastore_types.Key.from_path(u'Imageitem', 515L, _app=u'fileshare')
is not JSON serializable

Is there any way to send the key for datastore entity to client side?

Any advice greatly appreciated.

Answer 1

If you want to JSON encode a key item, just use the string version of the key by passing the key to str():

itemkey = {'imgid': str(item_list[0].key())}