CollapseAll of ExpandRowColumn

[pgyf]

If there is a double key, the value of data-key is as follows:
data-key= "A:2:{s:2: "Id" ; s:19:" 144703302436491058 "; payment_time" s:12: "; i:0;}"
The results are CollapseAll and expandAll do not work

Modify
https://github.com/kartik-v/yii2-grid/blob/master/ExpandRowColumn.php#L350
to
$detailOptions['data-key'] = is_object($key) || is_array($key) ? json_encode($key) : $key;

CollapseAll and expandAll can work,But does not show Loading

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[kartik-v]

json_encode will not work if the $key is an object - so it has to be serialized

[pgyf]

If there are multiple primary keys in the table also can not work
$detailOptions['data-key'] = is_object($key) ? serialize($key) : (is_array($key) ? json_encode($key) : $key);