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https://issues.apache.org/jira/browse/SLING-522?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12605013#action_12605013
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Eric Norman commented on SLING-522:
-----------------------------------
I encountered this issue as well. My solution was basically the same as has
been described in the comments. I scanned the primary type and mixin types to
find a matching property definition and use the definition to provide defaults
for the property type and for determining if the property is multi-valued.
I'll attach a patch with my changes.
> Default POST Servlet writes single-value property even though node type
> mandates multi-value.
> ---------------------------------------------------------------------------------------------
>
> Key: SLING-522
> URL: https://issues.apache.org/jira/browse/SLING-522
> Project: Sling
> Issue Type: Bug
> Components: Servlets Post
> Affects Versions: 2.0.1
> Reporter: Julian Sedding
> Priority: Minor
> Fix For: 2.1.0
>
>
> If a JCR node-type defines a multi-value property (e.g. String[]) and only a
> single value for this property is posted, the property will become
> single-value (e.g String). The POST Servlet should check, if the property is
> multi-value and respect that. Otherwise, any code reading the property value
> would need to check, whether it is multi-value or not and handle both cases.
> It might even be beneficial to force a multi-value property, if there is no
> node-type that defines it. This would provide for better control of
> unstructured data.
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