grails - Single select <g:select> is producing more than one "selected" item by default -

i have <g:select> in 1 of gsps looks this:

<g:select id="location" name="criteria.location" from="${example.location.list()}" optionkey="id" required="" value="1" class="many-to-one"/> 

the expected result this, right?

expected result:

<select id="location" name="criteria.location" required="" class="many-to-one" >     <option value="1" selected="selected" >1st location name</option>     <option value="2" >2nd location name</option>     <option value="3" >3rd location name</option>     <!-- entries omitted -->     <option value="49" >49th location name</option>     <option value="50" >50th location name</option> </select> 

but get? end two selected items. 49th option gets selected well, , cannot begin imagine why! there absolutely no mention of value "49" in code...

actual result:

<select id="location" name="criteria.location" required="" class="many-to-one" >     <option value="1" selected="selected" >1st location name</option>     <option value="2" >2nd location name</option>     <option value="3" >3rd location name</option>     <!-- entries omitted -->     <option value="49" selected="selected" >49th location name</option>     <option value="50" >50th location name</option> </select> 

if change value in <g:select> "3" example, 3rd option gets selected, whatever reason 49th item still gets selected well.

edit: more bizarre, if change value property value greater than 49, select works , nth option selected!

update: posted answer detailing how got working, still not understand original behaviour of <g:select> tag.

does have idea going on here?

---

grails version: 2.2.0

use value attribute

value="${location ?: 49}"   

e.g.

<g:select id="location" name="criteria.location" from="${example.location.list()}" optionkey="id" required="" value="${location ?: 49}" class="many-to-one"/>