`validatesPresenceOf()`

Description

Validates that the specified property exists and that its value is not blank.

Function Syntax

validatesPresenceOf([ properties, message, when, condition, unless ])

Parameters

Parameter	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] can't be empty`	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`).
`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).

Examples

<!--- Make sure that the user data can not be saved to the database without the `emailAddress` property. (It must exist and not be an empty string) --->
<cfset validatesPresenceOf("emailAddress")>