provide import class

app/models/additionals_import.rb

@@ -0,0 +1,43 @@
+class AdditionalsImport < Import
+  class_attribute :import_class
+
+  # Returns the objects that were imported
+  def saved_objects
+    object_ids = saved_items.pluck(:obj_id)
+    import_class.where(id: object_ids).order(:id)
+  end
+
+  def project=(project)
+    settings['project'] = project
+  end
+
+  def project
+    settings['project']
+  end
+
+  def mappable_custom_fields
+    object = import_class.new
+    @custom_fields = object.custom_field_values.map(&:custom_field)
+  end
+
+  def build_custom_field_attributes(object, row)
+    object.custom_field_values.each_with_object({}) do |v, h|
+      value = case v.custom_field.field_format
+              when 'date'
+                row_date(row, "cf_#{v.custom_field.id}")
+              when 'list'
+                row_value(row, "cf_#{v.custom_field.id}").try(:split, ',')
+              else
+                row_value(row, "cf_#{v.custom_field.id}")
+              end
+      next unless value
+
+      h[v.custom_field.id.to_s] =
+        if value.is_a?(Array)
+          value.map { |val| v.custom_field.value_from_keyword(val.strip, object) }.compact.flatten
+        else
+          v.custom_field.value_from_keyword(value, object)
+        end
+    end
+  end
+end