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validatesUniquenessOf()

Name	Type	Required	Default	Description
properties	string	No		Name of property or list of property names to validate against (can also be called with the `property` argument).
message	string	No	[property] has already been taken	Supply a custom error message here to override the built-in one.
when	string	No	onSave	Pass in `onCreate` or `onUpdate` to limit when this validation occurs (by default validation will occur on both create and update, i.e. `onSave`).
allowBlank	boolean	No	false	If set to `true`, validation will be skipped if the property value is an empty string or doesn't exist at all. This is useful if you only want to run this validation after it passes the `validatesPresenceOf` test, thus avoiding duplicate error messages if it doesn't.
scope	string	No		One or more properties by which to limit the scope of the uniqueness constraint.
condition	string	No		String expression to be evaluated that decides if validation will be run (if the expression returns `true` validation will run).
unless	string	No		String expression to be evaluated that decides if validation will be run (if the expression returns `false` validation will run).
includeSoftDeletes	boolean	No	true	Set to `true` to include soft-deleted records in the queries that this method runs.

// Make sure that two users with the same username won't ever exist in the database table
validatesUniquenessOf(property="username", message="Sorry, that username is already taken.");

// Same as above but allow identical usernames as long as they belong to a different account
validatesUniquenessOf(property="username", scope="accountId");