grails - About bean of hasErrors -

assuming have following object in controller

objcollection = [obj1, obj2, obj3] 

and in each obj following

obj1 = [     input = value, inputa1 = valuea1, inputa2 = valuea2 ]      obj2 = [     input = value, inputb2 = valueb2, inputa3 = valuea3 ]  obj3 = [     input = value, inputc2 = valuec2, inputa3 = valuea3 ] 

and gsp looks this

<div class="control-group ${haserrors(bean: objcollection.obj, field: 'input', 'error')}">     <g:textfield name='input' value='${objcollection?.obj}'> </div>  <div id="subform" class="subcontainer">     <g:each var='obj' in='${objcollection}' status='a'>          <div id='obj${a+1}'>             <div class='subaccordion'>                 <div>                     <g:each var='objinstance' in='${obj}' status="b">                         <g:render template="miniform" model="[b:b, objinstance:objinstance]"/>                     </g:each>                 </div>             </div>         </div>     </g:each> </div> 

while template miniform

<div class="control-group ${haserrors(bean: objinstance, field: 'input', 'error')}">     <g:textfield name='input' value='${objinstance?.obj}'> </div> <div class="control-group ${haserrors(bean: objinstance, field: 'input', 'error')}">     <g:textfield name='input' value='${objinstance?.obj}'> </div> 

where name attribute changed using jquery input a1, a2, b1, b2, c1 , c3 upon form load.

now question is, did passed object bean on haserrors? because tried haserrors work somehow didn't work expectation.

did made mistake anywhere?

also did map object correctly every input in gsp? i'm not quite sure on how use safe operator '?' avoid nullpointer error.