Add spaghetti sauce and ravioli to a crockpot. Stir together and sprinkle with grated cheese.
Cover and cook on low 2-3 hours until ravioli is cooked through. Be careful not to over-cook.
Cube watermelon and add to a large bowl along with the remaining salad ingredients. Gently toss to combine.
Serve ravioli with salad on the side.