app/models/custom_field_group.rb
class CustomFieldGroup < ApplicationModel
belongs_to :workgroup, optional: false
has_many :custom_fields, -> { order(position: :asc) }, class_name: "CustomField", dependent: :nullify, foreign_key: "custom_field_group_id", inverse_of: :custom_field_group
validates :resource_type, presence: true
acts_as_list scope: :workgroup
end