Override the attr_writer to check for duplicate columns, and call handle_duplicate_columns if necessary.
# File lib/sequel/extensions/duplicate_columns_handler.rb, line 48 def columns=(cols) if cols && cols.uniq.size != cols.size handle_duplicate_columns(cols) end super end
Customize handling of duplicate columns for this dataset.
# File lib/sequel/extensions/duplicate_columns_handler.rb, line 41 def on_duplicate_columns(handler = (raise Error, "Must provide either an argument or a block to on_duplicate_columns" unless block_given?; nil), &block) raise Error, "Cannot provide both an argument and a block to on_duplicate_columns" if handler && block clone(:on_duplicate_columns=>handler||block) end