RUBY constant Scope

Special case "1"

The inner class does not automatically refer to its external class's parent class

# info = "Top-level Info"  class  father   info  =  "parent class Info"  # puts Info  end  class  son  < father    # Info = " Subclass Info " # puts Info   Class  inner   # info = "Inner class Info"  puts info  end  end  # puts Info  

`<class:Inner>‘: uninitialized constant Son::Inner::Info (NameError)

Special case "2"

For inner classes There are other classes that inherit the resources of the external class.

info  =  "Top Info"  class  first   info  =  "first Info"  end  class   second   info  =  "Second Info"   class  inner     < first    Puts info  end  end 

output：Second Info

Priority relationship

Inner classes themselves > External classes > Parent classes of Inner classes > Parent classes of external classes > top level

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RUBY constant Scope