| Module | Sequel::Plugins::Touch::InstanceMethods | 
| In: | lib/sequel/plugins/touch.rb | 
Touch the model object. If a column is not given, use the model‘s touch_column as the column. If the column to use is not one of the model‘s columns, just save the changes to the object instead of attempting to a value that doesn‘t exist.
    # File lib/sequel/plugins/touch.rb, line 85
85:         def touch(column=nil)
86:           if column
87:             set(column=>touch_instance_value)
88:           else
89:             column = model.touch_column
90:             set(column=>touch_instance_value) if columns.include?(column)
91:           end
92:           save_changes
93:         end