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comp.lang.ruby

Missing Method Errors

Ari Brown

4/21/2007 2:00:00 AM

Hi all,
This is my first post here, so don't dish out the loser points to me
so heartily.

I have only recently gotten into Ruby, and I was writing my own
methods that I might use in a couple future programs (they were YAML
things, like open and closing a file, and reading a file). I saved it
as yaml.rb . However, when I require it ( require 'yaml.rb') and then
try to call a method I had defined in yaml.rb, I get an error saying
that the method had not been defined yet:

test.rb:8: undefined method `yaml_save' for main:Object (NoMethodError)

yaml_save was the method I had tried to use.
Any thoughts? Suggestions? Flames?

Part II
The missing command

Today I was in the car and was coding on my dad's laptop (Windows
XP), and I was writing a shuffling algorithm. I had used the .pop
command in it once, and it worked. But then all of a sudden Ruby was
saying that there was no command 'pop'. The syntax I had used it in
was like so:

b = some_array.pop

Once again, any thoughts? Suggestions? Flames?

--------------------------------------------|
If you're not living on the edge,
then you're just wasting space.
4 Answers

james.d.masters

4/21/2007 2:17:00 AM

0

> test.rb:8: undefined method `yaml_save' for main:Object (NoMethodError)
>
> yaml_save was the method I had tried to use.
> Any thoughts? Suggestions? Flames?

The code that cause this issue would be nice... but it looks like you
are calling it from an Object something like this:

a = Object.new
a.yaml_save

Anyway, this message is saying that the method that you are trying to
call could not be found (i.e. it's undefined). Try this:

a = Object.new
a.asdf

Same error...

Alex Young

4/21/2007 6:54:00 AM

0

Ari Brown wrote:
> Hi all,
> This is my first post here, so don't dish out the loser points to me
> so heartily.
>
> I have only recently gotten into Ruby, and I was writing my own methods
> that I might use in a couple future programs (they were YAML things,
> like open and closing a file, and reading a file). I saved it as yaml.rb
> .
That's unlucky - there's a yaml.rb in the standard library which require
loads in preference to yours. Try renaming your yaml.rb, or moving it
into a folder so that you can call "require 'ari/yaml'", or some
equivalent. As an aside, it's usual (and, under some circumstances,
required) to leave off the file extension with require.

> Part II
> The missing command
>
> Today I was in the car and was coding on my dad's laptop (Windows XP),
> and I was writing a shuffling algorithm. I had used the .pop command in
> it once, and it worked. But then all of a sudden Ruby was saying that
> there was no command 'pop'. The syntax I had used it in was like so:
>
> b = some_array.pop

Sounds like some_array isn't actually an array. Care to post the code
that's causing the error?

--
Alex

Ari Brown

4/21/2007 2:53:00 PM

0


On Apr 20, 2007, at 10:20 PM, james.d.masters@gmail.com wrote:
> The code that cause this issue would be nice... but it looks like you
> are calling it from an Object something like this:
>
> a = Object.new
> a.yaml_save

The code I'm using is this:

require 'yaml.rb'

filename = 'fun.txt'
test_array = ['hey',
'look',
'zoo']

yaml_save test_array, filename

read_array = yaml_load filename

puts(read_array == test_array)

The yaml.rb code is:

require 'yaml'

def yaml_save object, filename
File.open filename, 'w' do |f|
f.write(object.to_yaml)
end
end

def yaml_load filename
yaml_string = File.read filename

YAML::load yaml_string
end



~ Ari
English is like a pseudo-random number generator - there are a
bajillion rules to it, but nobody cares.

hemant

4/22/2007 10:04:00 AM

0

On 4/21/07, Ari Brown <ari@aribrown.com> wrote:
>
> On Apr 20, 2007, at 10:20 PM, james.d.masters@gmail.com wrote:
> > The code that cause this issue would be nice... but it looks like you
> > are calling it from an Object something like this:
> >
> > a = Object.new
> > a.yaml_save
>
> The code I'm using is this:
>
> require 'yaml.rb'
>
> filename = 'fun.txt'
> test_array = ['hey',
> 'look',
> 'zoo']
>
> yaml_save test_array, filename
>
> read_array = yaml_load filename
>
> puts(read_array == test_array)
>
> The yaml.rb code is:
>
> require 'yaml'
>
> def yaml_save object, filename
> File.open filename, 'w' do |f|
> f.write(object.to_yaml)
> end
> end
>
> def yaml_load filename
> yaml_string = File.read filename
>
> YAML::load yaml_string
> end
>


You should really use, some other name for your library because as
pointed Alex, its in conflict with ruby standard library.