How to add an item to a collection in RacerJs DerbyJs? -

i want add item collection using racerjs/derbyjs, doesn't work. must overlooking something...

what tried

model.set('news', [     { text: "something" } ]); 

and does set news-item. however, when another time, overwrite existing item, , not add new one. how that?

model.push('news', {text:"sometext"}) fails "object not array".

basically, want basic version of "post update , show on 'wall' app", without rooms nor making use of arrays. 1 collection, , that's it.

stacktrace of .push() variant:

wed may 22 2013 09:35:24 gmt+0200 (w. europe daylight time) (23168) d7564d2d-f23 8-4ce0-a0a2-6e376e9b5cb1 ? ver: 0 - push 'news', { text: 'adsf' }  c:\xampp\htdocs\derbyjs\knowedge\app1\node_modules\derby\node_modules\racer\lib\ memory.js:185     throw new typeerror(arr + ' not array');           ^ typeerror: [object object] not array     @ object.arraylookupset [as _arraylookupset] (c:\xampp\htdocs\derbyjs\knowedge\app1\node_modules\derby\node_modules\racer\lib\memory.js:185:11)     @ object.applyarraymethod [as _applyarraymethod] (c:\xampp\htdocs\derbyjs\knowedge\app1\node_modules\derby\node_modules\racer\lib\memory.js:145:18)     @ object.push (c:\xampp\htdocs\derbyjs\knowedge\app1\node_modules\derby\node_modules\racer\lib\memory.js:118:15)     @ applytxn (c:\xampp\htdocs\derbyjs\knowedge\app1\node_modules\derby\node_modules\racer\lib\transaction.js:114:32)     @ object.exports.applytxntodoc (c:\xampp\htdocs\derbyjs\knowedge\app1\node_modules\derby\node_modules\racer\lib\transaction.js:126:3)     @ function.queryinterface.publish (c:\xampp\htdocs\derbyjs\knowedge\app1\node_modules\derby\node_modules\racer\lib\adapters\pubsub-memory\channel-interface-query.js:25:24)     @ pubsub.publish (c:\xampp\htdocs\derbyjs\knowedge\app1\node_modules\derby\node_modules\racer\lib\pubsub\pubsub.js:63:10)     @ store.module.exports.proto.publish (c:\xampp\htdocs\derbyjs\knowedge\app1\node_modules\derby\node_modules\racer\lib\pubsub\pubsub.store.js:174:20)     @ publish (c:\xampp\htdocs\derbyjs\knowedge\app1\node_modules\derby\node_modules\racer\lib\txns\txns.store.js:230:15)     @ next (c:\xampp\htdocs\derbyjs\knowedge\app1\node_modules\derby\node_modules\racer\lib\middleware.js:7:26)     @ module.exports.events.middleware.txn (c:\xampp\htdocs\derbyjs\knowedge\app1\node_modules\derby\node_modules\racer\lib\txns\txns.store.js:220:11)     @ store._sendtodb.lockingdone (c:\xampp\htdocs\derbyjs\knowedge\app1\node_modules\derby\node_modules\racer\lib\store.js:294:12)     @ mergeall.setuproutes (c:\xampp\htdocs\derbyjs\knowedge\app1\node_modules\derby\node_modules\racer\lib\adapters\db-memory\index.js:70:13)     @ dbmemory.mergeall.get (c:\xampp\htdocs\derbyjs\knowedge\app1\node_modules\derby\node_modules\racer\lib\adapters\db-memory\index.js:44:5)     @ mergeall.setuproutes (c:\xampp\htdocs\derbyjs\knowedge\app1\node_modules\derby\node_modules\racer\lib\adapters\db-memory\index.js:62:16)     @ dbmemory.mergeall.get (c:\xampp\htdocs\derbyjs\knowedge\app1\node_modules\derby\node_modules\racer\lib\adapters\db-memory\index.js:44:5)     @ mergeall.setuproutes (c:\xampp\htdocs\derbyjs\knowedge\app1\node_modules\derby\node_modules\racer\lib\adapters\db-memory\index.js:60:14)     @ next (c:\xampp\htdocs\derbyjs\knowedge\app1\node_modules\derby\node_modules\racer\lib\store.js:321:15)     @ store._sendtodb (c:\xampp\htdocs\derbyjs\knowedge\app1\node_modules\derby\node_modules\racer\lib\store.js:324:10)     @ writetodb (c:\xampp\htdocs\derbyjs\knowedge\app1\node_modules\derby\node_modules\racer\lib\txns\txns.store.js:216:15)     @ next (c:\xampp\htdocs\derbyjs\knowedge\app1\node_modules\derby\node_modules\racer\lib\middleware.js:7:26)     @ serialemitprep (c:\xampp\htdocs\derbyjs\knowedge\app1\node_modules\derby\node_modules\racer\lib\txns\txns.store.js:125:9)     @ next (c:\xampp\htdocs\derbyjs\knowedge\app1\node_modules\derby\node_modules\racer\lib\middleware.js:7:26)     @ incrver (c:\xampp\htdocs\derbyjs\knowedge\app1\node_modules\derby\node_modules\racer\lib\modes\lww.js:18:12)     @ next (c:\xampp\htdocs\derbyjs\knowedge\app1\node_modules\derby\node_modules\racer\lib\middleware.js:7:26)     @ object.module.exports.events.init.store.eachcontext.context.guardwrite (c:\xampp\htdocs\derbyjs\knowedge\app1\node_modules\derby\node_modules\racer\lib\accesscontrol\accesscontrol.store.js:54:51)     @ accesscontroller (c:\xampp\htdocs\derbyjs\knowedge\app1\node_modules\derby\node_modules\racer\lib\txns\txns.store.js:103:17)     @ next (c:\xampp\htdocs\derbyjs\knowedge\app1\node_modules\derby\node_modules\racer\lib\middleware.js:7:26)     @ object.run (c:\xampp\htdocs\derbyjs\knowedge\app1\node_modules\derby\node_modules\racer\lib\middleware.js:10:12)     @ socket.module.exports.events.socket (c:\xampp\htdocs\derbyjs\knowedge\app1\node_modules\derby\node_modules\racer\lib\txns\txns.store.js:267:26)     @ socket.racer.log.sockets.sockets.on.socket.on (c:\xampp\htdocs\derbyjs\knowedge\app1\node_modules\derby\node_modules\racer\lib\log.server.js:150:20)     @ socket.eventemitter.emit [as $emit] (events.js:91:17)     @ socketnamespace.handlepacket (c:\xampp\htdocs\derbyjs\knowedge\app1\node_modules\derby\node_modules\racer\node_modules\socket.io\lib\namespace.js:335:22)     @ manager.onclientmessage (c:\xampp\htdocs\derbyjs\knowedge\app1\node_modules\derby\node_modules\racer\node_modules\socket.io\lib\manager.js:488:38)     @ websocket.transport.onmessage (c:\xampp\htdocs\derbyjs\knowedge\app1\node_modules\derby\node_modules\racer\node_modules\socket.io\lib\transport.js:387:20)     @ parser. (c:\xampp\htdocs\derbyjs\knowedge\app1\node_modules\derby\node_modules\racer\node_modules\socket.io\lib\transports\websocket\hybi-16.js:39:10)     @ parser.eventemitter.emit (events.js:88:17)     @ opcodehandlers.1.finish (c:\xampp\htdocs\derbyjs\knowedge\app1\node_modules\derby\node_modules\racer\node_modules\socket.io\lib\transports\websocket\hybi-16.js:288:16)     @ parser.opcodehandlers.1.expectdata [as expecthandler] (c:\xampp\htdocs\derbyjs\knowedge\app1\node_modules\derby\node_modules\racer\node_modules\socket.io\lib\transports\websocket\hybi-16.js:299:15)     @ parser.add (c:\xampp\htdocs\derbyjs\knowedge\app1\node_modules\derby\node_modules\racer\node_modules\socket.io\lib\transports\websocket\hybi-16.js:466:24)     @ parser.expect (c:\xampp\htdocs\derbyjs\knowedge\app1\node_modules\derby\node_modules\racer\node_modules\socket.io\lib\transports\websocket\hybi-16.js:499:10)     @ parser.opcodehandlers.1.expectdata (c:\xampp\htdocs\derbyjs\knowedge\app1\node_modules\derby\node_modules\racer\node_modules\socket.io\lib\transports\websocket\hybi-16.js:298:18)     @ parser.add (c:\xampp\htdocs\derbyjs\knowedge\app1\node_modules\derby\node_modules\racer\node_modules\socket.io\lib\transports\websocket\hybi-16.js:466:24)     @ parser.expect (c:\xampp\htdocs\derbyjs\knowedge\app1\node_modules\derby\node_modules\racer\node_modules\socket.io\lib\transports\websocket\hybi-16.js:499:10)     @ opcodehandlers.1.expectdata (c:\xampp\htdocs\derbyjs\knowedge\app1\node_modules\derby\node_modules\racer\node_modules\socket.io\lib\transports\websocket\hybi-16.js:296:16)     @ opcodehandlers.1 (c:\xampp\htdocs\derbyjs\knowedge\app1\node_modules\derby\node_modules\racer\node_modules\socket.io\lib\transports\websocket\hybi-16.js:313:9)     @ parser.processpacket (c:\xampp\htdocs\derbyjs\knowedge\app1\node_modules\derby\node_modules\racer\node_modules\socket.io\lib\transports\websocket\hybi-16.js:533:8)     @ parser.add (c:\xampp\htdocs\derbyjs\knowedge\app1\node_modules\derby\node_modules\racer\node_modules\socket.io\lib\transports\websocket\hybi-16.js:466:24)     @ socket.websocket.onsocketconnect (c:\xampp\htdocs\derbyjs\knowedge\app1\node_modules\derby\node_modules\racer\node_modules\socket.io\lib\transports\websocket\hybi-16.js:141:17)     @ socket.eventemitter.emit (events.js:88:17)     @ tcp.onread (net.js:396:14)

to create item in collection can call model.set explicitly specified path containing document id, example:

model.set('news.' + model.id(), {   text: "something" }) 

model.id method generate unique id on each call it.