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https://issues.apache.org/jira/browse/TAP5-2099?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13614313#comment-13614313
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Barry Books commented on TAP5-2099:
-----------------------------------
While I'm all for fixing the read only parameter problem this change looks like
it allows the value of a literal binding to be updated. I'm not sure I like the
idea of a get to literal:1 returning anything other than a 1.
> Update parameters bound to literal: or symbol: from a mixin
> -----------------------------------------------------------
>
> Key: TAP5-2099
> URL: https://issues.apache.org/jira/browse/TAP5-2099
> Project: Tapestry 5
> Issue Type: Improvement
> Affects Versions: 5.3.6
> Reporter: Lance
> Labels: binding, literal-binding, mixin, symbol-binding
> Attachments: TAP52099-1.patch
>
>
> Currently, I cannot update a component component parameter that is
> initialized with a literal: or symbol: binding from a mixin. If I try to
> @BindParameter the param and change it's value, I get a "Binding %s is
> read-only" exception (originating from AbstractBinding).
> I propose that literal and symbol bindings are sourced from a PerThreadValue
> that can be updated by a mixin.
> My original need for this was to create a "SinglePage" mixin for the Grid
> component which would set the rowsPerPage parameter to Integer.MAX_VALUE. I
> can't currently do this because by default, the parameter is a symbol:
> binding.
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