Avoiding use of class references built via strings/`constantize`

The problem:

As a developer, if I am changing how a class is used or named, I would need to grep against the codebase with the name of the class. If this class is ever referenced via constantize then I will not find that reference without already knowing it's already there.

eg.

# Class definitions
class AdminUser; end
class RegularUser; end

# bad usage
user_klass = "#{admin_accessible? ? "Admin" : "Regular")}User".constantize

# good usage
user_klass =
  if admin_accessible?
    AdminUser
  else
    RegularUser
  end

The solution:
I think using constantize is the issue here. I think there are cases where it needs to be used, but in general it causes the problem I outlined.

The issue names no file, test, or entry point; start with the problem statement and its constantize examples. Review the five-comment discussion to determine the intended scope and exceptions. Done should mean the style guide has an agreed, actionable position on string-built class references.