topic Re: No Constraints in PropertyList in Alfresco Archive

No Constraints in PropertyList

ddanninger — Tue, 11 May 2010 15:01:56 GMT

Hi,i try to get a list of a custom Content model. It works so far, but if i want to know the Constraints of a Property its just blank. How comes? Did i do something wrong or is it a bug?So if i get the JSON Result of the WebScript: "http://192.168.254.128:8080/alfresco/service/api/classes/cx_doc/pro

Re: No Constraints in PropertyList

ddanninger — Mon, 09 Aug 2010 11:03:45 GMT

Hi,
its already a few months ago.

Does nobody has the same Problem ? Even in the Webscripts its commented out to recieve the Constraints and show it in the Output.

How can u recieve the Constraints then?

In 3.3G its possible to use the Form generation Webservice and u could recieve the Constraints then. But if i just want to get the Metadata information of content type its for me not possible to read the constraints. Because the form generation service just can recieve the metadata information of a node.

So how do u do that?

Re: No Constraints in PropertyList

cszamudio — Thu, 26 Aug 2010 23:59:16 GMT

Hi,

I'm stuck on this problem as well. I don't yet see a way to retrieve the lists of constraints on a Property. I've created a LIST for a constraint just as you've done, and I can't retrieve it for the life of me. I've tried using both the SOAP-based DictionaryService and the web scripts as you've done. Neither one gives up this information (as far as I can tell). The SOAP-based DictionaryService does provide one piece of information that's not available from the Web Scripts - the default value.

I'm trying to construct a bulk-load wizard that would allow the user to select from a selection list for populating a property. If you've found a solution, I'd sure be pleased to hear it.

Cheers,
Carlos S. Zamudio

Re: No Constraints in PropertyList

cszamudio — Tue, 14 Sep 2010 00:30:58 GMT

I'm thinking there's a bug in the .ftl (below) for generating the constraints output in the JSON format. I can't find any property constraint where this FreeMarker template generates to correct output. Maybe someone with FTL expertise can comment/advise.

Carlos S. Zamudio


<#macro propertyDefJSON propertydefs>
    <#escape x as jsonUtils.encodeJSONString(x)>
    {
        <#if propertydefs.name?exists>
        "name" : "${propertydefs.name.toPrefixString()}",
        </#if>
        <#if propertydefs.title?exists>
        "title" : "${propertydefs.title}",
        </#if>
        <#if propertydefs.description?exists>
        "description" : "${propertydefs.description}",
        </#if>
        <#if propertydefs.defaultValues?exists>
        "defaultValues" : "${propertydefs.defaultValues}",
        <#else>
        "defaultValues" : "",
        </#if>
        <#if propertydefs.dataType?exists>
        "dataType" : "${propertydefs.dataType.name.toPrefixString()}",
        </#if>
        "multiValued" : ${propertydefs.multiValued?string},
        "mandatory" : ${propertydefs.mandatory?string},
        "enforced" : ${propertydefs.mandatoryEnforced?string},
        "protected" : ${propertydefs.protected?string},
        "indexed" : ${propertydefs.indexed?string},
        "indexedAtomically" : ${propertydefs.indexedAtomically?string},
        "constraints" :
        [<#–
        <#if propertydefs.constraints?exists>
            <#list propertydefs.constraints as constraintdefs>
        { 
                <#assign keys = constraintdefs.getConstraint()?keys>
                <#list keys as key>
                    <#if key == "expression">
            "${key}" : <#if constraintdefs.getConstraint()[key]?exists>"${constraintdefs.getConstraint()[key]}" <#else>"has no value"</#if>
                    </#if>
                    <#if key_has_next>,</#if>   
                </#list> 
        }<#if constraintdefs_has_next>,</#if>
            </#list>
        </#if>–>
        ],
        "url" : "${"/api/property/" + propertydefs.name.toPrefixString()?replace(":","_")}"
    }
    </#escape>
</#macro>
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Re: No Constraints in PropertyList

cszamudio — Tue, 14 Sep 2010 00:56:46 GMT

OK, obviously as I look a bit closer, the constraints portion of the ftl has been commented out. So, this explains why we get no constraints for any properties.

Re: No Constraints in PropertyList

scouil — Sun, 13 Mar 2011 05:33:41 GMT

Hi,

I had the problem too and decided to extend the file above to solve it.
If someone still needs it:


"restricValues" :
[
   <#if propertydefs.constraints?exists>
      <#list propertydefs.constraints as constraintdefs>
         <#list constraintdefs.getConstraint()?keys as key>
            <#if key == "getAllowedValues">
               <#assign vals = constraintdefs.getConstraint().getAllowedValues()>
               <#list vals as val>
   "${val}"
   <#if val_has_next>,</#if>
               </#list>
            </#if>
         </#list>
      </#list>
   </#if>
]
‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

It might not be optimal since I'm not really familiar with alfresco API but… Well… It works.
And it doesn't seem to break anything.

Scouil

Re: No Constraints in PropertyList

ddanninger — Mon, 28 Mar 2011 12:45:53 GMT

Yes thats nice thanks,
but actually i think it would be great that it will be also in the new community release… i got promised in paris on the devcon it will be fixed in the next version but still an open issue in jira

Re: No Constraints in PropertyList

ryanbobko — Thu, 31 Mar 2011 16:05:51 GMT

Just to be clear: did you change the .ftl that comes with Alfresco to get this to work? Is there a solution without modifying Alfresco directly? Thanks.

Re: No Constraints in PropertyList

scouil — Thu, 31 Mar 2011 18:26:41 GMT

Yes this was done by modifying one of the default alfresco webservices:
<TOMCAT HOME>\webapps\alfresco\WEB-INF\classes\alfresco\templates\webscripts\org\alfresco\repository\dictionary\propertydefinition.lib.ftl

Since that's a webservice I think that you should be able to create your own webservice similarly and deploy it as a webscript extension but I'm not familiar with the macro system.

Re: No Constraints in PropertyList

cszamudio — Thu, 31 Mar 2011 20:16:26 GMT

Just FYI. I ended up replacing the Alfresco version of the .ftl file with the edited version. The fact that someone explicitly commented out parts of the file made me nervous, but I've not seen any problems. Of course, I've had to remember this change whenever I upgraded. (-;

Re: No Constraints in PropertyList

scouil — Thu, 31 Mar 2011 23:00:48 GMT

Same here I'm currently running it without any problem for now.
To remember to edit with upgrade I got a README.txt in my application folder.

But as ddanninger said, the fix will hopefully make its way to a community version soon so you won't need to patch that file anymore. (a few modifications will be needed in your webservice though since the json won't be exactly the same)

Re: No Constraints in PropertyList

ddelapasse — Fri, 24 Apr 2015 21:14:47 GMT

So 4 years later…this section is still commented. Scouil's solution works great, but why is it STILL commented? Can anyone tell if there is an existing issue for this?

Re: No Constraints in PropertyList

ddelapasse — Fri, 12 Jun 2015 17:56:02 GMT

Can I add the correction to my amp to overwrite the built-in version? It seems to work just fine. I don't understand why it's commented out.

Can someone tell me the magical folder hierarchy where it must be placed in the amp to overwrite this script? I know this is improper, but I really need the GET /classes functionality to return the correct constraints along with the constrained properties! What is the best way?