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https://issues.apache.org/jira/browse/TAP5-1015?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12833362#action_12833362
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Howard M. Lewis Ship commented on TAP5-1015:
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I see this as supporting a new return type, say, StreamPageContent, that would
trigger the rendering of a particular page.
The use case here is that a given page's activation context represents a
particular entity and the entity does not exist; it would be nice to be able to
leave the URL unchanged but stream some other page's content (i.e., the "Foo
Entity Not Found" page).
> Add support to return other pages from onActivate()
> ---------------------------------------------------
>
> Key: TAP5-1015
> URL: https://issues.apache.org/jira/browse/TAP5-1015
> Project: Tapestry 5
> Issue Type: Improvement
> Components: tapestry-core
> Reporter: Andreas Pardeike
>
> Currently, onActivate() has no ability to delegate the rendering to another
> page or stream without a redirect. It would be really helpful to support more
> return types from this method.
> Motivation: if the activation context is faulty you might want to keep the
> url the way it is and still be able to render a different page than the
> current page.
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