skip CSV columns

active_admin_import has the ability to skip CSV columns (Available from 3.1.0 version).

This is useful when the CSV file has some unnecessary columns.

For example you have a CSV file with columns "Name", "Last name" and "Age". And your database table does not have an "age" column.

ActiveAdmin.register Post
  active_admin_import before_batch_import: lambda { |importer|
                        importer.batch_slice_columns(['name', 'last_name'])
                      }
end

Another trick: importer.batch_slice_columns(Author.column_names) allows you to pass all columns from table. In this case importer will use only columns listed both in CSV and Author.columns_names.