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Grails Domain class JSON

I have this controller:

respond :Alert.list()

It gives:

[{id: ..}, {id: ..}]

What I want:

{"alerts":[{"id":...}. {id:..}]}

How do I let the respond make into the format I want? I don't want to have a custom JSON marshaller as my dataset is big.

What will be the outcome if I do the following than having a custom marshaller?

def o = new JSONObject()
def arr = new JSONArray()
def a = new JSONObject()

alerts.each{
    a.put("id",it.id)
    ...
    arr.add(a)
}
o.put("alerts",arr)
respond o
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Try it like this:

  //do your filtering here to get alertList


respond: [alerts: alertList]

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