I keep getting this error when trying to range over a slice pointer.
app/domain/repositories/class_repository.go:24: cannot range over classes (type *[]entities.Class)
What am I doing wrong?
You’re assuming the pointer to a slice will be automatically dereferenced for the iteration.
That’s not the case and there’s no reason for that because a slice is already a kind of pointer, rendering a pointer to a slice totally useless.
From Effective Go :
If a function takes a slice argument, changes it makes to the elements of the slice will be visible to the caller, analogous to passing a pointer to the underlying array.
Internally, a slice is made of
- a pointer to the first element of the slice in the underlying array
- the length of the slice
- the capacity of the slice (the slice can usually be extended until the end of the array)
This structure is very small, rendering a pointer useless.