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https://issues.apache.org/jira/browse/TAP5-726?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12788285#action_12788285
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Howard M. Lewis Ship commented on TAP5-726:
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The correct solution here is to provide the model explicitly (there's a
parameter for that).
> Grid should determine the class row type from a field when there is no
> BeanModel and GridDataSource
> ---------------------------------------------------------------------------------------------------
>
> Key: TAP5-726
> URL: https://issues.apache.org/jira/browse/TAP5-726
> Project: Tapestry 5
> Issue Type: Bug
> Components: tapestry-core
> Affects Versions: 5.1.0.5
> Reporter: Denis Stepanov
> Priority: Minor
>
> CollectionGridDataSource uses first collection item to determine the class
> type, but in situation when collection contains different hierarchy
> implementation there is a ClassCastException
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