On Mon, Aug 6, 2012 at 9:24 PM, barry.alexander
<[hidden email]> wrote:
Using this code snippet returns a Day object OK, but the class name gets
appended with an @ and a string of characters. What is that? When I try to
render as JSON, it blows chunks.
Datastore datastore = datastoreService.releaseCalendarDatastore()
Date calendarDate = new
SimpleDateFormat("yyyy-MM-dd").parse(params.calDate)
def Day day = datastore.find(Day.class, "relCalDay =", calendarDate).get()
render day as JSON
Cannot cast object 'com.gap.release.calendar.Day@6371be16' with class
'com.gap.release.calendar.Day' to class 'grails.converters.JSON'. Stacktrace
follows:
Message: Cannot cast object 'com.gap.release.calendar.Day@6371be16' with
class 'com.gap.release.calendar.Day' to class 'grails.converters.JSON'
The JSON converter doesn't know how to deal with your Day.class object. You need to register a converter for that class when you bootstrap your app.
JSON.registerObjectMarshaller(Polygon) {
return new WKTWriter().write(it);
}
JSON.registerObjectMarshaller(EspaceStyle) {
}
JSON.registerObjectMarshaller(DeviceType) {
}
In the examples above, any property of type Polygon, EspaceStyle, or DeviceType will be written to JSON by executing the supplied closure. So long as you return an object that JSON knows how to convert, it'll handle the rest, so if you have a complex object, just return a Map. I'm sure you can find lots of info by googling registerObjectMarshaller or looking at the docs for the JSON object.
Locked
