Grails passing property with dot to controller - sorting

Question

I am trying to pass params.sort to my controller.
if (params.sort && params.order == "asc") {
pricesInPriceList = row.prices.sort{it.material."${params.sort}"}
}
if (params.sort && params.order == "desc"){
pricesInPriceList = row.prices.sort{it.material."${params.sort}"}.reverse()
}
[priceListInstance: row, pricesInPriceList: pricesInPriceList]
It works fine with following gsp:
<tr>
<g:sortableColumn property="sku" title="SKU" />
<g:sortableColumn property="description" title="Description" />
</tr>
Now if I change my gsp to following:
<tr>
<g:sortableColumn property="material.sku" title="SKU" />
<g:sortableColumn property="material.description" title="Description" />
</tr>
and my controller part to:
if (params.sort && params.order == "asc") {
pricesInPriceList = row.prices.sort{it."${params.sort}"}
}
if (params.sort && params.order == "desc"){
pricesInPriceList = row.prices.sort{it."${params.sort}"}.reverse()
}
Why this is happening? now my params.sort has a value material.sku for example however if I want to evaluate it."${params.sort}" it does not work. But if I will change my params.sort to sku and then change my controller to it.material."${params.sort}" everything is working. Where I am making mistake?
Thank you.

Answer 1

This sort will work for both cases - params.sort = 'parent' or params.sort = 'parent.child'
row.prices.sort{ params.sort.tokenize('.').inject(it){v, k -> v."$k"} }
It's essentially the same as the solution for this question: Grails accessing nested fields using gstrings

Answer 2

from your modified gsp code :
<tr>
<g:sortableColumn property="material.sku" title="SKU" />
<g:sortableColumn property="material.description" title="Description" />
</tr>
one most possible reason why your code is not working is
1.property="material.sku" did not match the property of the field and i am sure you never
define the property name in that way. cause the
property - name of the property relating to the field
2.if you are trying to read property from message source, then you could do as follows
<tr>
<g:sortableColumn property="sku" title="SKU" titleKey="material.sku" />
<g:sortableColumn property="description" title="Description" titleKey="material.sku"/>
</tr>
Hope this may help you.
Regards
Motilal