gistfile1.js

var editUser = new FormHelper({
  action : "/edit",
  fields : {
    name : {
      in : { type : "string" },
      out : {
        // Will always be string or ["string"] for form submissions.
        type : "string",
        validators : [{
          required : true,
          message : "This field is required"
        }, {
          // Non-required validations will not be executed if the field is required and value is empty.

        }]
      }
    },
    email : {
      type : "string",
      inout : {
        validators : [{
          regex : /^[^@]+@[^@]+\.[^@]+$/,
          message : "Invalid e-mail address."
        }]
      }
    },
    bestFriend : {
      type : User,
      in : {
        transform : function (v) {
          return v.getId();
        }
      },
      out : {
        type : "string",
        required : false,
        // Is executed before validators,
        // return value is validated against `type`.
        // Value is passed as 2nd arg to validators.
        transform : function (id) {
          return UserRepository.find(parseInt(id, 10));
        },
        validators : [{
          func : function (id, user) {
            return UserRepository.isValidId(id);
          },
          message : "Invalid user id."
        }, {
          func : function (id, user) {
            return user.hasFriend(user);
          },
          message : "You're not friends with this user."
        }]
      }
    },
    friends : {
      type : [User],
        in : {
          transform : function (v) {
            return v.getId();
          }
        },
      out : {
        type : ["string"],
        transform : function (ids) {
          return C.map(ids, function (v) { return UserRepository.find(parseInt(id, 10)); });
        }
      }
    },
    subscribeToNewsletter : {
      type : "boolean",
      out : {
        required : true
      }
    },
    country : {
      enumerable : ["SWE", "ENG", "FIN", "USA"]
    }
  }
});