How did Ji Chang hire Jiang Ziya as his military adviser?

According to the legendary military masterpiece "Historical Records and Biography of Six Towers", one day, Ji Chang went out hunting and met Jiang Ziya by the Wei River. Because he had a dream first, he decided that this man was an able person to help him. Through talking with him, I felt a great feeling of seeing each other for a long time. Ji Chang said happily, "My grandfather said before his death,' Where there are saints, Zhou Bichang thrives'. Mr. Wang is a saint in the prosperous Zhou Dynasty, and my great-grandfather has been looking forward to Mr. Wang for a long time! " At present, Jiang Ziya is honored as "King Taigong" and hired as a strategist.