在Ruby和Rails中存储布尔值的数组或散列

我想用Ruby创建一组值,我可以在Rails下的MySQL数据库中存储和检索这些值。

在Delphi中,我将使用:

//Create an enumeration with four possible values
type TColour = (clRed, clBue, clBlack, clWhite);
//Create a set which can hold values from the above enumeration
     TColours = set of TColours;
//Create a variable to hold the set
var MyColours = TColours;
begin
  //Set the variable to hold two values from the enumeration
  MyColours = [clRed, clBlack];
  //MyColours now contains clRed and clBlack, but not clBlue or clWhite

  //Use a typecast to convert MyColours to an integer and store it in the database
  StoreInDatabase(Integer(MyColours));

  //Typecast the Integer back to a set to retrieve it from the database
  MyColours := TColours(RetrieveFromDatabase);
end;

如何在Ruby/Rails中实现同样的功能?

为了澄清,假设我有一个表格,上面有“红色”、“蓝色”、“黑色”、“白色”复选框。用户可以选择无、一个或多个值。如何存储和检索该组值?

顺便说一句,在delphi中实现这一点的另一种方法是使用位数学:

const
  Red = 1;
  Blue = 2;
  Black = 4;
  White = 8;
var MyColours: Integer;
begin
  MyColours := Red+Black; //(or MyColours = Red or Black)