Im guessing that the ground on the fixture was permanently attached at the factory. The methods that may be used to accomplish this will depend on the design and construction of each light fixture.
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Ground wire broke off light fixture. This saves you from a shock if the fixture gets energized and you touch it. After installing it i noticed the ground wire had come loose from the fixture. If the box is metal then attach the fixture ground wire to the box. Many light fixtures will have a green grounding screw or a bare ground wire which is provided to make the connection with the ground wire from the cord or the ground wire of the circuit wiring. Electrical wiring in some older homes does not have a ground wire for outlets ans switches and some older homes have ground wires that are bonded behind the electrical box. The ground wires purpose is to protect you in case the metal part of the fixture accidentally becomes energized.
If a ground wire comes off your light fixture you can try to reattach the wire or ground the fixture a different way. The ground wire will be either green or bare copper wire. Light fixtures and the ground wire. I just installed a new light fixture chandelier. When i tried to push it back in the post broke off. If the wire is covered with green insulation you will need to strip 12 inch of the green insulation off of the tip of the wire.
Locate the ground wire coming from your homes electrical box where the light fixture is to be installed. Match the white wire from your new ceiling light fixture to the white wire from the. Wrap the bare or green wire from the ceiling light around the same screw. You can either go get a new fixturestrap crossbar with a ground wire or at the very least a ground screw attach your own wire. Tighten the screw on the strap. If the box is not metal and a ground wire is not available in the fixture box then you can still install the key less light fixture.
There was a little metal post sticking out of the top of the fixture where the ground wire had been attached. Or make certain the ground from the feed is properly secured to the ceiling box. I just took the ground wire and wrapped it around the metal tube of the fixture.