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I we increment version to say 2.1 we could add code to dashboard to check
for markup version and if it encounters version 2.0 to print verbose error
telling how to migrate markup to 2.1.
I don't see how both version can be supported simulteniously but at lease
Version attribute must be checked and forms older version must fail with
descriptive message rather than causing unpredictable behavior.

Sincerely yours,
Stan Lagun
Principal Software Engineer @ Mirantis

 <slagun at mirantis.com>


On Fri, Jul 4, 2014 at 8:24 PM, Timur Sufiev <tsufiev at mirantis.com> wrote:

> Hi, folks!
>
> Recently we had decided to change a bit how Murano's dynamic UI works,
> namely do not explicitly specify 'name' field in first 'Add
> Application' form, but add it here automatically, since every
> component in Murano has a name. To avoid confusion with the 'name'
> field added by hand to the first form's markup, 'name' field on the
> first step will be forbidden and processing of an old UI markup which
> has such field will cause an exception. All these changes are
> described in the blueprint [1] in a greater detail.
>
> What is not entirely clear to me is whether should we increase
> 'Version' attribute of UI markup or not? On one hand, the format of UI
> markup is definitely changing - and old UI definitions won't work with
> the UI processor after [1] is implemented. It is quite reasonable to
> bump a format's version to reflect that fact. On the other hand, we
> will hardly support both format versions, instead we'll rewrite UI
> markup in all existing Murano Apps (there are not so many of them yet)
> and eventually forget that once upon a time the user needed to specify
> 'name' field explicitly.
>
> What do you think?
>
> [1]
> https://blueprints.launchpad.net/murano/+spec/dynamic-ui-specify-no-explicit-name-field
>
> --
> Timur Sufiev
>
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