From: 520079130762-0001@... (Michael Neumann)
Date: 2002-10-22T13:58:54+09:00
Subject: Re: XMLRPC and complex data structures

On Mon, 2002-10-21 at 23:55, Daniel Berger wrote:
> Just to see what would happen with regular Ruby structs (i.e. no extensions), I
> tried adding this method to the xmlrpc server:
>
> # Return an array of structs
>    def get_aos
>       TestStruct = Struct.new("TestStruct",:name,:age)
>       dan = TestStruct.new("Dan",32)
>       joe = TestStruct.new("Joe",29)
>       a = []
>       a.push(dan,joe)
>       return a
>    end

Simply, don't use a constant: 

   def get_aos
      testStruct = Struct.new("TestStruct",:name,:age)
      dan = testStruct.new("Dan",32)
      joe = testStruct.new("Joe",29)
      a = []
      a.push(dan,joe)
      return a
   end

You can also create the structs via Struct::TestStruct.new.


> This caused a "dynamic constant assignment" error, and I could only get it to
> work if I declared the struct type outside the class.  Could dynamic struct
> generation be the source of the problem?  If so, why?

This is not a problem, if you don't use constants. See above.
Note that you can also move the struct definition outside the method:

TestStruct = Struct.new("TestStruct",:name,:age)

def get_aos
   dan = TestStruct.new("Dan",32)
   joe = TestStruct.new("Joe",29)
   a = []
   a.push(dan,joe)
   return a
end




Regards,

  Michael