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Hello, sorry for banal question

I would like to aucomatic insert concat value in a field acting on "before insert section" on hook.
At the same time I need that this field is read only for users...

SOME_TEXT + ['field1_value'] + SOME_OTHER_TEXT

I have tried many ways like:
$data['field'] = "TEXT" & $data['field1_value'] & "TEXT2" ;

but nothing.
Could you please help me?

You need to make the field as Readonly in Appgini.

and use sql udpate to set the value in your database, something like this:

Thanks.
So you say there is no way to insert value on a field as "concat" between text and value from another field, by using expression like:

$data[field] = concat expression

The only way is by sql.

SOLVED
Easy as drink a glass of water:

$data['field'] = 'TEXT' . $data['field1_value'] . 'TEXT2';

Simply using . (dot)