Convert Picklist to multi-select combo box

[shawkatmarrouf]

I've tried converting picklist field type to multis-select combo box through editing field type in "vtiger_field" and field structure in "u_yf_[module]" but didn't work!

The purpose is to convert the field type without losing data history in records, any ideas?

[rskrzypczak]

Restore everything to its original state first
then run:

\App\Db\Updater::addRoleToPicklist([_YOUR_FIELD_NAME_]);
// _YOUR_FIELD_NAME_ = vtiger_field.fieldname

Finally change:

• uitype to 33
• maximumlength => 65535
• and field structure in "u_yf_[module]"