How to Convert a Slice of Structs to a Slice of Empty Interfaces in Go?

Converting a Slice of Structs into Slice of Empty Interface

When passing data to AppEngine's datastore.PutMulti function, it requires a slice of []interface{}. However, this can lead to compilation errors if you attempt to assign a slice of structs, []*MyStruct, to the []interface{} slice.

The error arises because the Go compiler considers these two types incompatible, resulting in a failure to assign src to dest.

Solution

Unfortunately, there is no direct way to copy a slice of structs into a slice of empty interface without copying each element individually. This is because casting a struct to an interface creates a wrapped version of the struct. An interface contains a pointer to the original type and a descriptor for the type itself. Hence, to properly wrap each struct, you must copy them one by one.

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