prevent encoding of taglib output - grails

Question

In my Grails app, I've defined the following tag which outputs a Map
class DataBindingTagLib {
static namespace = "bind"
def domainParamList = { attrs ->
def params = [:]
// put stuff in the map
return params
}
}
When I call this tag and store the result in a variable
<g:set var="chartParams" value="${bind.domainParamList([:])}"/>
If I inspect the type of this variable, it's a StreamCharBuffer. So it seems that the value output by the taglib is automatically being converted to this type. I tried to prevent this by changing the line above to
<g:set var="chartParams" value="${raw(bind.domainParamList([:]))}"/>
But it made no difference. Is there a way to prevent this from happening such that I can store the Map instance returned by the tag in the chartParams GSP variable? I'm not sure if this is relevant, but I have the following automatic encodings defined in Config.groovy
grails {
views {
gsp {
encoding = 'UTF-8'
htmlcodec = 'xml' // use xml escaping instead of HTML4 escaping
codecs {
expression = 'html' // escapes values inside ${}
scriptlet = 'none' // escapes output from scriptlets in GSPs
taglib = 'none' // escapes output from taglibs
staticparts = 'none' // escapes output from static template parts
}
}
}
}

Answer 1

You need to instruct your tag library to return an object as a result, by default tag libraries are expected to modify the output stream.
First, let the tag library know you need this particular method/closure to return an object by using the returnObjectForTags static hint. Then, simply modify the method/closure to return your object instead of modifying out. With these two changes your tag will return an object and you can use it as such.
class DataBindingTagLib {
static namespace = "bind"
static returnObjectForTags = ['domainParamList']
def domainParamList = { attrs ->
def params = [:]
// put stuff in the map
return params
}
}