def type_cast_code(var_name)
case type
when :string then nil
when :text then nil
when :integer then "(#{var_name}.to_i rescue #{var_name} ? 1 : 0)"
when :float then "#{var_name}.to_f"
when :datetime then "#{self.class.name}.string_to_time(#{var_name})"
when :timestamp then "#{self.class.name}.string_to_time(#{var_name})"
when :time then "#{self.class.name}.string_to_dummy_time(#{var_name})"
when :date then "#{self.class.name}.string_to_date(#{var_name})"
when :binary then "#{self.class.name}.binary_to_string(#{var_name})"
when :boolean then "(#{var_name} == true or (#{var_name} =~ /^t(?:true)?$/i) == 0 or #{var_name}.to_s == '1')"
else nil
end
end