gorm/doc/associations/polymorphism.md

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# Polymorphism
Supports polymorphic has-many and has-one associations.
```go
type Cat struct {
Id int
Name string
Toy Toy `gorm:"polymorphic:Owner;"`
}
type Dog struct {
Id int
Name string
Toy Toy `gorm:"polymorphic:Owner;"`
}
type Toy struct {
Id int
Name string
OwnerId int
OwnerType string
}
```
Note: polymorphic belongs-to and many-to-many are explicitly NOT supported, and will throw errors.