"wrong number of arguments" What? I must be thick or somethi

ruby-talk
1

class PermutationIterator
    def initalize(data_set, nested = nil)
        @data_set = data_set
        @nested = nested || NilObject.new
        @key = 0
        @fresh = true
    end
end
a = PermutationIterator.new [1, 2, 3]

Will yield:

permutations.rb:9:in `initialize': wrong number of arguments (1 for 0)
(ArgumentError)
        from permutations.rb:9:in `new'
        from permutations.rb:9

What am I doing wrong?

···

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2

I think there is a typo: "def initalize"

class PermutationIterator
    def initalize(data_set, nested = nil)
        @data_set = data_set
        @nested = nested || NilObject.new
        @key = 0
        @fresh = true
    end
end
a = PermutationIterator.new [1, 2, 3]

Will yield:

permutations.rb:9:in `initialize': wrong number of arguments (1 for 0)
(ArgumentError) from permutations.rb:9:in `new' from

permutations.rb:9

···

On Fri, 4 Jan 2008 00:39:26 +0900, ole __ wrote

What am I doing wrong?
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3

class PermutationIterator
   def initalize(data_set, nested = nil)
       @data_set = data_set
       @nested = nested || NilObject.new
       @key = 0
       @fresh = true
   end
end
a = PermutationIterator.new [1, 2, 3]

Will yield:

permutations.rb:9:in `initialize': wrong number of arguments (1 for 0)
(ArgumentError)
       from permutations.rb:9:in `new'
       from permutations.rb:9

What am I doing wrong?

You've typoed initalize

Fred

···

On 3 Jan 2008, at 15:39, ole __ wrote:

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4

Hi,

You mistyped initialize.

Tiago Macedo

ole __ wrote:

···

class PermutationIterator
    def initalize(data_set, nested = nil)
        @data_set = data_set
        @nested = nested || NilObject.new
        @key = 0
        @fresh = true
    end
end
a = PermutationIterator.new [1, 2, 3]

Will yield:

permutations.rb:9:in `initialize': wrong number of arguments (1 for 0)
(ArgumentError)
        from permutations.rb:9:in `new'
        from permutations.rb:9

What am I doing wrong?

5

NilObject does not have a method called new.

···

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6

Ahh right. I needed somebody else's eyes to see that.
Thanks

···

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7

Yes, but he hadn't gotten to that point yet.

  @nested = nested || NilObject.new

won't work, and is probably unnecessary.

   @nested = nested

is probably enough, unless you really want to be able to pass false to
indicate no nested, which would be a strange interface for a ruby
method I think. But it that's what's actually desired, it should be

   @nested = nested || nil

···

On Jan 3, 2008 11:16 AM, Hugh Themm <mchughson@gmail.com> wrote:

NilObject does not have a method called new.

--
Rick DeNatale

My blog on Ruby
http://talklikeaduck.denhaven2.com/

8

Yes, but he hadn't gotten to that point yet.

Right. And I only posted a cut down version of the code. NilObject is
defined in the full version.

  @nested = nested || NilObject.new

won't work, and is probably unnecessary.

Interesting. Let me make certain you understand my intentions first.
NilObject looks like this:

class NilObject
    def method_missing(name, *params); end
end

It just swallows messages. It is an implementation of the Introduce Null
Object refactor
http://www.refactoring.com/catalog/introduceNullObject.html This means
that I don't have to continuously repeat checks for nil. It's explained
a bit better here
Introduce Null Object

This is a concept that has come straight out of Java so I'm interested
if there is a more ruby way of doing such things.

···

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9

That is the solution
Run
# ruby script/generate scaffold Product Admin:string

instead of
# ruby script/generate scaffold Product Admin

Blessings
juldtb@gmail.com

···

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10

Julix Andres wrote:

That is the solution
Run
# ruby script/generate scaffold Product Admin:string

instead of
# ruby script/generate scaffold Product Admin

Blessings
juldtb@gmail.com

I think you must have replied to the wrong thread or something.

···

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