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https://issues.apache.org/jira/browse/FREEMARKER-178?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17493756#comment-17493756
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Dániel Dékány commented on FREEMARKER-178:
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Yes, but since the result of {{?filter}} is a new Java object (made by the
template engine), what Java API you expect to be available on the result anyway?
> Using map or filter built-ins looses custom template model
> ----------------------------------------------------------
>
> Key: FREEMARKER-178
> URL: https://issues.apache.org/jira/browse/FREEMARKER-178
> Project: Apache Freemarker
> Issue Type: Bug
> Components: engine
> Affects Versions: 2.3.30
> Reporter: Steven Davelaar
> Priority: Major
>
> When you are using a custom template sequence model that implements the
> TemplateModelWithAPISupport interface so you can use the api built-in, you
> can no longer use the api built-in once you have applied the map or filter
> function, because the map and filter functions then return a new instance of
> TemplateModelListSequence, which does not implement the
> TemplateModelWithAPISupport interface.
> For example, imagine a custom sequence model that supports the toString()
> method, then the following works fine:
> {noformat}
> ${myList?api.toString()}{noformat}
> However, when I apply a filter, like this:
> {noformat}
> ${myList?filter(i -> i.name == 'foo')?api.toString()}{noformat}
> I get a APINotSupportedTemplateException because the filter has returned a
> TemplateModelListSequence instance.
>
>
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