load json datas from proxy

[Craysis]

Hi all !
I must loading datas from a WebService in Json format like that :

[
    {
        "CodeMission": "FOVA",
        "Dessertes": [],
        "HeureProbable": "19/09/2012 10:38",
        "HeureTheorique": "19/09/2012 10:38",
        "Numero": "127034",
        "Quai": null,
        "Retard": "00:00",
        "Sens": "P",
        "Voie": "2",
        "VoiePrecedente": null
    },
    {
        "CodeMission": "VOPA",
        "Dessertes": [
            {
                "CodeTR3A": "BFX",
                "Nom": "Le Bras de Fer"
            },
            {
                "CodeTR3A": "EVC",
                "Nom": "Evry Courcouronnes"
            }
        ],
        "HeureProbable": "19/09/2012 10:47",
        "HeureTheorique": "19/09/2012 10:47",
        "Numero": "126620",
        "Quai": null,
        "Retard": "00:00",
        "Sens": "P",
        "Voie": "A",
        "VoiePrecedente": null
    }
]

So i have my 2 models :

                Ext.define('ChoixTrain', {
                    extend: 'Ext.data.Model',
                    config: {
                        fields:['CodeMission','HeureProbable','HeureTheorique','Numero','Quai','Retard','Sens','Voie','VoiePrecedente'],
                        hasMany: {model: 'Desserte', name: 'Dessertes'},
                        proxy: {
                            type: 'jsonp',
                            autoLoad:true,
                            url: 'https://plop.com/Trainservice.svc/GetListTrainsAtGare/COE',
                            method: 'POST',
                            params: {
                                username: 'plop',
                                password: 'plop'
                            },
                            headers: {
                                'Accept': 'application/javascript'
                            },
                            reader: {
                                type: 'json',
                                model: 'ChoixTrain'
                            }
                        }
                    }
                });
                
                Ext.define('Desserte', {
                    extend: 'Ext.data.Model',
                    config: {
                        fields:['CodeTR3A','Nom'],
                         belongsTo: 'ChoixTrain'

                    }
                });

and 1 store to load and retreive my datas :

                Ext.define('Desserte', {
                    extend: 'Ext.data.Model',
                    config: {
                        fields:['CodeTR3A','Nom'],
                         belongsTo: 'ChoixTrain'

                    }
                });
                
                var trains = Ext.create('Ext.data.Store', {
                    model: 'ChoixTrain'
                });
                
                trains.load({
                    callback: function() {
                        //the user that was loaded
                        var premierTrain = trains.first();

                        console.log("Premier Train : " + premierTrain)
                    }
                });

with the debuger I see my json string added as a script, so the webservice response is OK, but my "firstTrain" is undefined, and "trains" datas is empty !

what the problem in my code ?

Edit : I think the problem comes from my callbackKey, i have a script like "https://plop.com/..../...?callback=Ext.data.JsonP.callback1, but how can i acces to my data list now ?

[mitchellsimoens]

Is the JSON that is returned in JSONP format?