Children field is an array in mongoDB:
<?= $form->field($model, 'children') ?>
The error I get is:
Array to string conversion
I need to use implode(',', $model->children) somehow, how to use it in an ActiveForm? What to do now?
What is the solution? How to turn that array into a string?
The content of the $model->children attribute is displayed when being used in a $form->field() call. If the content of the attribute is an array and you want/need it to be a string you'll have to convert the content before the field() call.
So like this, it will probably work.
<?php
$model->children = implode(',', $model->children);
echo $form->field($model, 'children');
?>
Not sure editing a list value like this (in a textfield) is the best way. You'll have to explode the string back when saving. But the code above is the solution to turn that array into a string.
views file. I solved it by afterFind() in my core model in order to return string in the first place. +1 thanks.As I wanted to turn it into string in every widget, grid view and so I used afterFind() function in my model in order to convert it into string. Now everything seems awesome:
public function afterFind() {
parent::afterFind();
if (is_array($this->children)) {
$this->children = implode(',', $this->children);
}
}