mongoid/mongoid — comment on commit 216314d49fba340812a12efe071698baeef06f32
File:  line 0
By yfeldblum:

If something should be done, it should be the capability to map Ruby methods to backing keys without assuming the method name is the same as the key.

field :foo_id, map_to: "foo-id"

It's better if we mangle method names ourselves than if Mongoid did it for us automatically in a way we cannot control.

But again, this is only if something actually needs to be done.