A loss of temper led Rhys Potaka to hit his ex-partner with a jandal.
Potaka, 31, pleaded guilty to assaulting his ex-partner when he appeared in the Whanganui District Court on Wednesday.
His lawyer Stephanie Burlace said Potaka had made a early guilty plea and it was a first offence of this nature.
Judge Philip Crayton said it was a violent act that demonstrated his loss of temper.
"Having grabbed her and dragged her you struck her with a jandal."
Potaka was sentenced to 12 months supervision.