A vine with long thin light green or violet pods eaten as avegetable?

That sounds like "field peas," also known as "cow peas" or "black-eyed peas." The link below has good pictures of the plant, flowers, pods, and peas.

A vine with long thin light green or violet pods eaten as avegetable?
I may be oversimplifing the question, but is it a bean? Beans come in many colors.