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.
| Name | Type | Required | Default | Description |
|---|---|---|---|---|
| property | string | Yes | Name of property to get the previous value for. |
changedFrom(property) <!--- 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()>