GSP / Groovy-g：每个对象数组

Question

I'm trying to use g:each tag at a map but GSP don't recognize it.

The code is:

    if(previousQuestions == null)
    {
        previousQuestions = []
    }
    def obj = AnimaisTreeMap.get(curNode)

    previousQuestions.push('question':obj.nodeDescription, 'answer': getDescOptionAnswer(optionAnswered))

The g:each tag is:

<g:each in="${previousQuestions}" var="row" status="i">
    <div>
        <label>${row.question}</label>
        <label>${row.answer}</label>                            
    </div>
    <br/>
</g:each>       

The output is:

[{question=vive na água, answer=Não}, {question=tem listras, answer=Sim}]

As far as I know the object that g:each reads may be at JSON format "property:value" but my object is "property=value"

How could I fix it?

UPDATED

After seeing this link , I found the solution. The problem itself was with "forward" function, where I passed "previousQuestions" to another action. Instead of "params", the correct way is "model".

        forward(action:'index', model: [curNode: nextNode.id,
                                        previousNode: curNode, 
                                        curQuestion: curQuestion,
                                        previousQuestions: answersTrace])                   

When I need to recover "previousQuestions", I must use "request" injected object at controller. After this, my code was OK

1 : this link

Answer 1

You appear to be adding two maps each time you call push() . Try creating each map you want to add to your array of maps, instead of just passing separate key value pairs.

I believe this is what you want:

previousQuestions.push(['question':obj.nodeDescription, 
                        'answer': getDescOptionAnswer(optionAnswered)])

Answer 2

Try this:

//This is a far better way of checking null strings 
//shorter and also checks for '' as well as null
if(!previousQuestion)  {
   previousQuestions = []
} else {
   //this segment you have not provided so as a test ensure it 
   //matches List element above that you have declared - take a look at console
   println "this is probably your issue ${previousQuestions.getClass()} what is class here ????"
}

def obj = AnimaisTreeMap.get(curNode)

// generate a map on the fly good for iterations, 
// even though this is not iterated.

previousQuestions << ['questions': obj.nodeDescription as String, 
'answer':  getDescOptionAnswer(optionAnswered) as String]

//within genrated map above the elements have been converted to as String 
// Because you have not given the workings of getDescriptionAnswer
// in theory you should not need  as String this is just for testing

render (view: 'something', model: [previousQuestions:previousQuestions])