extjs store error handling - json

Question

I am trying to handle an exception in an Ext.data.Store instance when creating a new Ext.data.Record. When the server responds with the following json:
{"success": false, "message": "some text"}
I get an exception of type 'request', even though the server returns an HTTP 200 Response!
To get a 'remote' error I have to create an object with the root property
({
"success": false,
"message": "some text",
"data": {
"PositionId": "00000000-0000-0000-0000-000000000000",
"Name": "123"
}
})
...but I don't want this. Is there any way to change this behaviour?
Also, when I insert a record in the store, it is automatically added to the associated grid, but if an error occurs it remains there, so I need to reload store on every error. Is there any better way to do this?

Answer 1

You should catch one of the two Store events:
loadexception (deprecated)
exception
For example you could:
// make the store
var myStore = new Ext.data.Store({...});
// catch loading exceptions
myStore.on('exception',function( store, records, options ){
// do something about the record exception
},this);
// load store
myStore.load();
You could also just use the success and failure events from the store to take action based on the success flag.

Answer 2

Finally, I've found out that if I send back empty data it works as expected. So I don't need to send back any fictional data, my server response is:
({
"success": false,
"message": "some text",
"data": {}
})

Answer 3

when success is false operation doesn't have a response property. This thread explains it very clairly!
http://www.sencha.com/forum/showthread.php?196013-access-operation.response-when-success-false
Example:
Ext.define("SC.store.SegurosCancelacionStore", {
extend: "Ext.data.Store",
model: "SC.model.PersonaSeguro",
proxy: {
timeout: 90000,
actionMethods: {
read : 'POST'
},
type: "ajax",
url: "../SegurosFinsolCancelacionServlet",
reader: {
type: "json",
root: "seguros",
messageProperty : 'msjError' //without this, it doesn't work
}
},
autoLoad: false
});
Implementation:
storeSegurosCancelacion.load({
params: {
'sucursal':sucursal,
'persona': persona
},
callback:function(records, operation, success){
msg.hide();
if(success == true){
if(records.length == 0){
Ext.Msg.alert('Resultado', 'No se ha encontrado información');
}
}
if(success == false){
try{
Ext.Msg.alert('Error', operation.getError()); // way more elegant than ussing rawData etc ...
}catch(e){
Ext.Msg.alert('Error', 'Error inesperado en el servidor.');
}
}
}
});
Best regards
#code4jhon