Cannot read property 'xxx' of null

[rgilkes]

The JSON I am getting from my http request usually returns like so:

- {
id: 1209902856001
name: "test video"
 - customFields: {
     parent_series: "tv_series"
 }
}

Unfortunately, if the parent_series fields is left blank it comes up null and gives the error "Cannot read property 'parent_series' of null".
-

- {
id: 1209882934001
name: "test video 2"
customFields: null
}

Is there anyway to just map an empty string if customFields is null? My code is below. Thanks!!

brightcove.models.BrightcoveVideos = Ext.regModel("brightcove.models.BrightcoveVideos", {
    fields: [
        {name: "video_name", type: "string", mapping: "name"},
        {name: "parent_series", type: "string", mapping: "customFields.parent_series"}
    ]
});

[mitchellsimoens]

Specify a convert function on the field that returns an empty string if it is null

[rgilkes]

Specify a convert function on the field that returns an empty string if it is null

Pardon my ignorance (kinda new to this all), but where would the function I make to convert it go? Would it go in the mapping parameter? i.e. {name: "parent_series", type: "string", mapping: checkSeries("customFields.parent_series")}

[mitchellsimoens]

Something like this...

{
    name : 'firstName',
    mapping : 'first name',
    type : 'string',
    convert : function(val) {
        if (!val) { val = ''; }
        return val;
    }
}

[rgilkes]

Using that method worked! Thanks!!

[Designworxz]

rgilkes can you show me your store code as am also trying to read Json data but fails.

Store = new Ext.data.Store({        model: 'User',	autoLoad:false,        proxy: {            type: 'ajax',            url : 'webservice',	    reader: {                type: 'json'				            }        }    });

[rgilkes]

rgilkes can you show me your store code as am also trying to read Json data but fails.

My store code is below...hope it helps!

brightcove.stores.playlists = new Ext.data.Store({
    storeId: 'store_playlists',
    model: 'brightcove.models.BrightcovePlaylists',
    autoLoad: true,
    sorters: [{
        property: 'playlist_name',
        direction: 'ASC'
    }],
    proxy: {
        type: 'scripttag',
        url: 'http://api.brightcove.com/services/library?command=find_all_playlists',
        reader: {
            type: 'json',
            root: 'items'
        },
        extraParams: {
            get_item_count: 'true',
            playlist_fields: 'name,id,filterTags',
            token: 'API TOKEN GOES HERE'
        }
    }
})