[solved] Can't set values programmatically in Multi-language custom field for "images"

[kyksh]

Found it out myself. As a test case, I set up a vanilla multi-language site and created a custom TextLanguage field "custom1" for the images on "home".

I wanted to change and save a single language value directly, e.g.

$mlFieldValues->setLanguageValue("de", "new Value") ; 
$p->of(false);
$p->save();

But this deletes all other language values.
Instead, I have to 1. read in all current values, 2. change whatever language value has to be changed and 3. save the entire object.

$newValues     = ["de"=>"DE overwritten by script", "fi"=>"FI overwritten by script"];

$p             = $pages->get(1);
$img           = $p->images->first();
$mlFieldValues = $img->custom1;

print "\n\nBEFORE:\n";print_r($mlFieldValues);
print "\n\nNEW VALUES:\n"; print_r($newValues);

$p->of(false);         
foreach($newValues as $lang => $newValue){
    $mlFieldValues->setLanguageValue($lang, $newValue) ; 
}
$img->custom1 = $mlFieldValues; 
$p->save();

print "\n\nAFTER:\n";print_r($mlFieldValues);

Output:

BEFORE:
ProcessWire\LanguagesPageFieldValue Object
(
    [default] => previous english value
    [de] => previous german value
    [fi] => previous  finnish value
)


NEW VALUES:
Array
(
    [de] => DE overwritten by script
    [fi] => FI overwritten by script
)


AFTER:
ProcessWire\LanguagesPageFieldValue Object
(
    [default] => previous english value
    [de] => DE overwritten by script
    [fi] => FI overwritten by script
)

 

Edited yesterday at 01:16 PM by kyksh