Default value for added field in plugin

Software Support
,
1

For example, OJS 3.4

Additional information
I’m writing new plugin for my needs. Plugin adds new Field (FieldAutosuggestPreset) to publication form. value should be an array (can be empty). i have issue with showing this field in workflow (publication tab). There, if publication don’t have record in DB (table publication_settings) with value "[ ]" new field is not showing up because of JS error when trying check length of null.
full error:

TypeError: Cannot read properties of null (reading 'length')
    at a.updateInputWidth (build.js?v=3.4.0.5:344:105829)
    at a.mounted (build.js?v=3.4.0.5:344:106467)
    at On (build.js?v=3.4.0.5:319:25861)
    at sn (build.js?v=3.4.0.5:319:23404)
    at Object.insert (build.js?v=3.4.0.5:319:35383)
    at E (build.js?v=3.4.0.5:319:52681)
    at Xr.__patch__ (build.js?v=3.4.0.5:319:53997)
    at e._update (build.js?v=3.4.0.5:319:21016)
    at Xr.r (build.js?v=3.4.0.5:319:21762)
    at e.get (build.js?v=3.4.0.5:319:28406)

migration isn’t solution b/c its only adding empty array as value only for existing publication (we also can add new ones by import or quick submit plugin)
So in that case i need a way to define default value for this field if it is not present in DB.
in “Form::config::before” hook i have defined value (even if not exists) and in first submission creation form it’s working correctly.
is there a way to add default value in hook “Schema::get::publication” when adding field to schema ?

$schema->properties->{'myNewField'} = (object)[
            'type' => 'array',
            'items' => (object) [
                'type' => 'string',
                'validation' => ['string'],
            ],
            'multilingual' => false,
            'apiSummary' => true,
            'validation' => ['array'],
            'default' => [],
        ];

tried that way and it didn’t work. any clues ?

2

had some more digging, and as following.

when i look at the source of the page /workflow/index/59/5#publication/titleAbstract i can see
script :

<script type="text/javascript">
pkp.registry.init('app', "WorkflowPage", <JSON>)
</script>

And in that JSON i have:
components → titleAbstract → fields - > myNewField with default value [] which is good,
but next
in
currentPublication → myNewField: null and that probably is source of issue.

How can i inject default value for this field every time current publication is get ? is there any hook for that ?