feat: Add pass_parent_resource_to_nested_has_many patch

lib/administrate/mistybird.rb

@@ -4,6 +4,7 @@
 require_relative "field/refile"
 require_relative "role_aware_resource_resolver"
 require_relative "patches/administrate_datetime_default"
+require_relative "patches/pass_parent_resource_to_nested_has_many"
 require_relative "patches/role_aware_resource_resolver"
 
 module Administrate

lib/administrate/patches/pass_parent_resource_to_nested_has_many.rb

@@ -0,0 +1,16 @@
+require "administrate/field/nested_has_many"
+
+Administrate::Field::NestedHasMany.prepend (
+  Module.new {
+    private
+
+    # see https://github.com/nickcharlton/administrate-field-nested_has_many/blob/main/lib/administrate/field/nested_has_many.rb#L101
+    def new_resource
+      if options[:parent]
+        @new_resource ||= associated_class_name.constantize.new("#{options[:parent]}": @resource)
+      else
+        @new_resource ||= @resource.send(association_name).build
+      end
+    end
+  }
+)