Render JSON in Groovy

Question

I have the following code to implement JSON in Groovy:

def index = {
    def list = WordList.list()
    render(contentType:"text/json"){
        LISTS {
            for(item in list){
                LIST (NAME: item.name, ID: item.id);
            }
        }
    }
}

Which almost works but it doesnt show multiple results i.e. the NAME and ID fields get overwritten on each cycle resulting in only the last record getting returned. What is the correct syntax to get this working?

Gregg · Accepted Answer · 2014-03-12 15:02:40Z

3

My solution in this case is to construct the JSON map explicitly, then render it as JSON.

An example:

def list = WordList.list()
def json = []
list.each{ item ->
    json << [name: item.name, id: item.id]
}
render json as JSON

You will need to import grails.converters.JSON to use this method.

edited Mar 12, 2014 at 15:02

Gregg

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answered Mar 12, 2014 at 15:00

SurrealAnalysis

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Comments

Gregg · Accepted Answer · 2014-03-12 15:01:41Z

2

def list = WordList.list()
list = list.collect { [name: it.name, id: it.id] }

render(contentType: 'application/json') {
   [lists: list]
}

answered Mar 12, 2014 at 15:01

Gregg

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3 Comments

maloney Over a year ago

Thanks! How do i add the JSON tag 'LIST' before each separate name/id?

tim_yates Over a year ago

You can't have a map with multiple identical keys

Gregg Over a year ago

Yea, what tim_yates said. Once you realize JSON is just a MAP, it will make things easier on you.

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