public / sequelize

… recieves the field value to validate as its sole argument. It should throw an error to indicate a validation failure. For example:

<pre>
      User = sequelize.define('User', {
        name: {
          type: Sequelize.STRING,
          validate: {
              len: {
                args: 9,
		msg: "Need atleast 9 chars"
              },
              customFn1: function(val) {
                # if name doesn't start with 'joe' then fail
                if (val.substr(0,3) !== "joe")
                    throw new Error("name should start with 'joe'")
              },
              customFn2: function(val) {
                # if name doesn't end in 'bloggs' then fail
                if (val.substr(-6) !== "bloggs")
                    throw new Error("name should end with 'bloggs'")
              }
          }
        }
      });
</pre>

You still invoke validation as you normally would, i.e.:

<pre>
# build user
var user = User.build({
    name : "test"
});

# validate
errors = user.validate();
# At this point errors will contain:
#
# { name : [
#	"Need atleast 9 chars"
#	"name should start with 'joe'"
#	"name should end with 'bloggs'"
# ] }
#
</pre>