CODEWITHSUNDEEP
freemarker
Arno
Arno

Reputation: 559

cast Obbject to string in Freemarker

I'm trying to print map's value bay key in FREEMARKER but got an exception 

freemarker.core.NonStringException: Error on line 6, column 69 in internal_monitors.ftl 
Expecting a string, date or number here, Expression object[key] is instead a freemarker.template.SimpleSequence

this is my code 

    <#if drives?exists>
<drives><#list drives as object>
    <drive>
    <#list object?keys as key>
        <${key}><#if object[key]?exists>${object[key]}<#else>null</#if></${key}>
    </#list>
    </drive></#list>
</drives>
</#if>

any ideas ?

Upvotes: 0

Views: 3938

Answers (1)

Jozef Chocholacek
Jozef Chocholacek

Reputation: 2924

  1. Use ?? instead of ?exists. The ?exists built-in is deprecated.

  2. You have to check, whether the object[key] value is displayable (e.g. string, number, date, ...) or a container (hash, sequence). In the later case, you have either to skip it, or iterate its contents:

    <#if drives??>
    <#list drives as object>
        <drive>
            <#list drive?keys as key>
                <${key}>
                <#if object[key]??>
                    <#if object[key]?is_hash>
                        HASH
                    <#elseif object[key]?is_sequence>
                        SEQUENCE
                    <#else>
                        ${object[key]}
                    </#if>
                <#else>
                    null
                </#if>
                </${key}>
            </#list>
        </drive>
    </#list>
</#if>

Upvotes: 1

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