Keep value of registry record between uninstalling and reinstall package

[plone.gur2 (Vincent)]

guys, in profiles/default/registry/main.xml
i have a registry record:>

    <record name=".....">
            <field type="plone.registry.field.Text">
            <title>long text</title>
            <description>.....</description>
            <required>False</required>
            </field>                
            <!--  <value purge="false"></value> -->         
    </record>

after reinstalling the package, i lost the value of record.
Is there any simply trick to keep the value of registry record?

Many thanks.

[espenmn (Espen)]

You could probably use a 'setuphandlers' (there is a pre_handler and a post_handler) and set the value (if it does not exist) with:

plone.api.portal.set_registry_record

Also: make sure that the uninstall profile does not remove it.

Generic setup, 'pre-handler'

I am the one who added post_handler to GenericSetup in 2016, see this PR. And this same PR introduces pre_handler, which works exactly the same as post_handler. The order is: Run the pre_handler, if available. Run the import steps. Run the post_handler, if available.

[gforcada]

This has bitten a few community members as well.

I managed to make a PR to fix it, see:

Respect purge=False on simple field types

It needs to be polished to get merged, but, hopefully within a few months there will be a fix upstream