Module Nesting

Nesting with module with double colons (::)

# Module User must be defined beforehand.

module User

end

class User::Admin

p Module.nesting

end

# Output:

$ruby main.rb

[User::Admin]

• If Module User is not defined beforehand, we get an error:

class User::Admin

p Module.nesting

end

# Output:

$ruby main.rb

main.rb:4:in `<main>': uninitialized constant User (NameError)

Nesting with module without double colons (::)

module User

class Admin

p Module.nesting

end

end

# Output:

$ruby main.rb

[User::Admin, User]