`changedFrom()`

Description

Returns the previous value of a property that has changed. Returns an empty string if no previous value exists. Wheels will keep a note of the previous property value until the object is saved to the database.

Function Syntax

changedFrom(property)

Parameters

Parameter	Type	Required	Default	Description
`property`	`string`	Yes		Name of property to get the previous value for.

Examples

<!--- Get a member object and change the `email` property on it --->
<cfset member = model("member").findByKey(params.memberId)>
<cfset member.email = params.newEmail>

<!--- Get the previous value (what the `email` property was before it was changed)--->
<cfset oldValue = member.changedFrom("email")>

<!--- The above can also be done using a dynamic function like this --->
<cfset oldValue = member.emailChangedFrom()>