How to assign values to nested object in freemarker - html-email

Question

This could be simple but i couldn't find it on internet.
I have nested object in freemarker as below which has multiple key i am not able to assign value to more than one key I am able to assign value to only one key
<#assign modifiedObjectChng = {
"beforeDep": {
"range": [],
"newTravelDate": "",
"reissueAllowed": false,
"changeAllowed": false,
"maxPenality": ""
},
"afterDep": {
"range": [],
"newTravelDate": "",
"reissueAllowed": false,
"changeAllowed": false,
"maxPenality": ""
}
}>
<#assign modifiedObjectChng = modifiedObjectChng + { "beforeDep" : {"newTravelDate" : "AAA" }}>
<#assign modifiedObjectChng = modifiedObjectChng + { "beforeDep" : {"reissueAllowed" : "BBB" }}>
${modifiedObjectChng.beforeDep.newTravelDate} //Output : error following has evaluated to null
${modifiedObjectChng.beforeDep.reissueAllowed} // gives correct result
My problem is how will i assign value to multiple keys i am able to do with only one key
Thanks in advance

Answer 1

You can do it like this:
<#assign modifiedObjectChng = modifiedObjectChng + { "beforeDep" : modifiedObjectChng.beforeDep + {"newTravelDate" : "AAA" }}>
<#assign modifiedObjectChng = modifiedObjectChng + { "beforeDep" : modifiedObjectChng.beforeDep + {"reissueAllowed" : "BBB" }}>
Not very nice, but FreeMarker doesn't support modifying the objects that was passed to the template. It's more convenient if the setter methods are exposed (see ?api), but in general it's quite odd if templates modify objects.