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https://issues.apache.org/jira/browse/TAP5-2099?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15158978#comment-15158978
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Barry Books commented on TAP5-2099:
-----------------------------------
It's true if you want the object passed to the symbol binding updated to the
new value the patch does not do that but I don't think that's possible or
desirable. The symbol binding object does not have access to the symbol
providers objects since the expression passed to the binding is a String and is
not mutable. If it did and that was implemented the next usage of the symbol
ComponentParameterConstants.GRID_ROWS_PER_PAGE would return something other
than 6 and I think that would be a bug. The symbol bindings should be invariant.
The above code does allow setting the field for the current request which is
what I wanted to do and what I think the Jira ticket is about. I'll update the
Github project tonight using the grid as an example.
> 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, 5.4
> Reporter: Lance
> Labels: patch
> 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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