Namespaces and Nesting

namespaces_and_nesting.rb

# Show an issue with reopened namespaces having lookups done using nesting
# instead of namespaces. Then show a simple work-around.

# Define a constant in a module with namespaced classes.
module Something
  CONSTANT = true
end

# Reopen Something add add a class using nesting.
module Something
  class Nested
    def self.constant?
      CONSTANT rescue "error"
    end
  end
end

# Reopen Something add add a class using shortcut.
class Something::Shortcut
  def self.constant?
    CONSTANT rescue "error"
  end
end

# Reopen Something add add a class using shortcut but include Something.
class Something::ShortcutWithInclude
  include Something

  def self.constant?
    CONSTANT rescue "error"
  end
end

puts "Nested             .constant? #{Something::Nested.constant?             }" # => true
puts "Shortcut           .constant? #{Something::Shortcut.constant?           }" # => error
puts "ShortcutWithInclude.constant? #{Something::ShortcutWithInclude.constant?}" # => true