生日的时候少不了蛋糕，那么蛋糕是怎么来的呢？原来蛋糕是跟蛋液的打发有关。万一蛋液打不发怎么办呢?
is there a special way with gorm to map a three domain classes relationship like this: 1 person belongs to N companies with M given roles (one or more roles for a given company)
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