Requirements: Silverstripe ^4 or ^5
Module adding functionality to Silverstripe grid fields. Adds a new button which triggers a modal, displaying a searchable list of objects.
User clicks on one of these to create a new object for the grid field with a has_many relationship setup with the object selected from the list.
Based on fromholdio/silverstripe-gridfield-addnew-manymanythrough with SS4 compat, otherwise inspired by sheadawson/silverstripe-quickaddnew.