California: Door opened car hits my car.

[NeilTheCop]

Went fishing was going to put fishing rods and coolers in the car. Car is a coupe so the only way was to open the door.

There were in fact two ways. Put the fishing gear in from the drivers OR the passenger side. You chose the wrong one.
Your car was struck and you have all the details of the driver who struck your car. That's what you have insurance for, so let your insurance company sort it out.