How should I rename my current file in Vim?
For example:
person.html_erb_spec.rb
person
Another way is to just use netrw, which is a native part of vim.
:e path/to/whatever/folder/
Then there are options to delete, rename, etc.
Here's a keymap to open netrw to the folder of the file you are editing:
map e :e =expand("%:p:h") . '/'