EXCLUSIVE

Drake drives a hard bargain ... if he tries hiring you but you turn him down, he'll have someone beat you up -- this according to famed rapper/producer Detail.

Detail has just filed a lawsuit against Drake, claiming the famous Canadian offered Detail a plum job back in 2014 as his exclusive producer. Problem was ... Detail didn't want to be tied to one guy, so he declined.

According to the lawsuit, the rejection didn't sit well with Drake, who became irate. Time passed but the bad feelings lingered. Detail claims in June 2014, Drake invited him to his Calabasas estate, on the pretext of working together again.

Detail says he arrived at 2 AM and was met by Drake's bodyguard, Chubbs, who coldcocked him and broke his jaw.

Detail says during the beating, Chubbs yelled, "I will beat all your asses, including your bitches. I don't give a f***. I will hit you again. Do you think Drake is soft? You think Drake's a punk?"