I'll be the first to admit, sometimes a one year old likes cake and sometimes they don't. Sometimes it takes them a while to warm up to a cake and you may need to help them out before they will even touch it and sometimes, no matter what you do, they want nothing to do with it. This is one of the reasons I now incorporate before portraits and bathtub "clean-up" sessions into my one year cake smash sessions... to ensure I capture some photos of a happy child... whether they like cake or not (they all seem to love the bath).
At my most recent cake smash session, Mom and I had nothing to worry about. This little guy loved everything! He played for a bit while I took some portraits, he splashed around with some rubber duckies in my miniature bathtub, and best of all... he could not wait to get his hands on the cake. He devoured it and didn't even need to use his hands at times! When Mom sat him down in front of it, she could barely get out of the way before he dove in. We had fun watching the show and it resulted in some great photos.