Freemarker scripts... how to detect missing properties?

theorbix

I'm writing a custom Web Script that returns the result of a query in JSON format.

This is the Freemarker script I use to generate the JSON output:

<#assign x = 0> 
{"recordsReturned":${search.itemsPerPage}, 
       "totalRecords":${search.totalResults}, 
       "startIndex":0, 
       "sort":null, 
       "dir":"asc", 
       "records":[ 
       
<#list search.results as row>          
  
           {"id":"${row.id}", 
           "name":"${row.name}",
           "icon":"${row.icon16}",
           "urlcontext":"${url.context}",
           "description":"${row.properties.description}",
           "author":"${row.properties.creator}"
           }
<#assign x = x+ 1> 
<#if x != search.itemsPerPage>
,
</#if>

</#list>
       ]
} 
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The problem is that sometimes the documents resulting from the search do not contain the description property (I don't know why…. this should be a default property of all documents contained in Alfresco), and this causes an exception in the execution of the Freemarker script:

freemarker.core.InvalidReferenceException - Expression row.properties.description is undefined on line 15, column 34 in org/alfresco/repository/search/keywordsearch.get.json.ftl. ‍

How can I avoid this error? Is there a way, in a Freemarker script, to check if a note property exist?

theorbix

Yep! One minute after posting, I found the correct syntax in another .ftl sample script:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <#if row.properties.description?? == true>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "description":"${row.properties.description}",
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </#if>
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Sometimes I should RTFM…