Re: How to put macros inside #assign

Monday, January 21, 2013, 1:01:31 PM, George Pogorelschi wrote:

> Hello,
>
> I'm new to freemaker. I have the following assign:
>
> <#assign trueFalse = {"true" : "Yes", "false" : "No"}/>
>
> I want to localize the values so i tried to write it like this:
>
> <#assign trueFalse = {"true" : '<@spring.message code="radioYes"/>', "false" :
> '<@spring.message code="radioNo"/>'}/>
>
> But instead of the values for "Yes" and "No" I get the string "<@spring.message
code="radioYes"/>>".
> Any ideea how to implement this.

Macro and directive calls (<#...>, <@...>) can occur only outside
other FreeMarker constructs, since they are for direct printing to the
output and for other side-effects and flow control. So you need a
*function* (or method) here, like <#assign ... "false":
spring.message("radioNo")>, but maybe Spring doesn't provide a
function variation. That's something that they definitely should do,
but, if they don't do that, you can still write a wrapper function.
Create a something like lib/utils.ftl, and there:

  <#function message code>
    <#local s><@spring.message code="radioYes"/></#local>
    <#return s>
  </#function>

and then in the templates:

  <#import "lib/utils.ftl" as u>

  ...

  <#assign ... "false": u.message("radioNo")>

This isn't very fast though, as what happens here is that Spring gets
that message as a String internally, then prints it to the output
Writer @spring.message, but that output is captured by FreeMarker's
#local directive, and converted back to String and stored in "s". So
the real solution is implementing the function in Java as a
TemplateMethodModelEx, and there use the Spring API to get that String
directly. Or, even better, framework code like this has better place
in the data-model...

-- 
Best regards,
 Daniel Dekany


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