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== isDirty



=== Purpose


Checks to see if a domain class instance has been modified.


=== Examples


[source,groovy]
----
def b = Book.get(1)
someMethodThatMightModifyTheInstance(b)

// when called without arguments returns true if any field was changed
if (b.isDirty()) {
    // can also check if one field has changed
    if (b.isDirty('title')) {
        ...
    }
}
----


=== Description


Parameters:

* `fieldName` - The name of a field to check

