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comp.lang.ruby

Newbie needs help with first project

Daniel Dale

3/22/2009 3:33:00 PM

I was told about Ruby several weeks ago and started my journey lol. I've
read several tutorials but reading the tutorials I still couldn't grasp
most of it and I thought finding a project I wanted to work on and
just diving in might be the best bet.

I want to create a program that I can enter my game collection into.
Ideally I want it to have a simple gui so others can use it and input
their games as well.

Here's the basic code I have I keep getting an error stating
uninitialized constant Game (NameError)

code:

class Games
def
initialize(title,platform,genre,rating,published_by,developed_by,year,condition)
@title=title
@platform=platform
@genre=genre
@rating=rating
@published_by=published_by
@developed_by=developed_by
@year=year
@condition=condition
end
end



class Games
def to_s
"Games:
#{@title}--#{@platform}--#{@genre}--#{@rating}--#{@published_by}--#(@developed_by)--#(@year)--#(@condition)"
end
end

game1=Game.new("FireProReturns","Playstation_2","Sports","Teen","Agetec_Inc.","Very_Good")
game1.to_s

Any help tips and etc on how to fix my problem and proceed will be
greatly appreciated.
--
Posted via http://www.ruby-....
14 Answers

Vikhyat Korrapati

3/22/2009 4:02:00 PM

0

I think your problem is that the class is named 'Games' but you are
initializing it by calling Game.new. Try changing 'Games' in the class
definition to 'Game', it should work then.
--
Posted via http://www.ruby-....

poison tooth

3/22/2009 6:19:00 PM

0

[Note: parts of this message were removed to make it a legal post.]

On Sun, Mar 22, 2009 at 9:32 AM, Daniel Dale <dochappy@gmail.com> wrote:

> I was told about Ruby several weeks ago and started my journey lol. I've
> read several tutorials but reading the tutorials I still couldn't grasp
> most of it and I thought finding a project I wanted to work on and
> just diving in might be the best bet.
>
> I want to create a program that I can enter my game collection into.
> Ideally I want it to have a simple gui so others can use it and input
> their games as well.
>
> Here's the basic code I have I keep getting an error stating
> uninitialized constant Game (NameError)
>
> code:
>
> class Game
> def
>
> initialize(title,platform,genre,rating,published_by,developed_by,year,condition)
> @title=title
> @platform=platform
> @genre=genre
> @rating=rating
> @published_by=published_by
> @developed_by=developed_by
> @year=year
> @condition=condition
> end
>
> def to_s
> "Games:
>
> #{@title}--#{@platform}--#{@genre}--#{@rating}--#{@published_by}--#(@developed_by)--#(@year)--#(@condition)"
> end
> end
>
>
> game1=Game.new("FireProReturns","Playstation_2","Sports","Teen","Agetec_Inc.","Very_Good")
> game1.to_s
>
> Any help tips and etc on how to fix my problem and proceed will be
> greatly appreciated.
> --
> Posted via http://www.ruby-....
>
> class Game
def
initialize(title,platform,genre,rating,published_by,developed_by,year,condition)
@title=title
@platform=platform
@genre=genre
@rating=rating
@published_by=published_by
@developed_by=developed_by
@year=year
@condition=condition
end

def to_s
puts "Games:
#{@title}--#{@platform}--#{@genre}--#{@rating}--#{@published_by}--#{@developed_by}--#{@year}--#{@condition}"
end
end

game1=Game.new("FireProReturns","Playstation_2","Sports","Teen",
"Good","Agetec_Inc.","2000","Very_Good")
game1.to_s


Is what I'm guessing you should have.
You can put both of the methods in the same class.
You forgot the 'puts' before the Games: in the to_s method
Also uh to print a variable you have to have #{var} not #(var)
and when you had the game1=Game.new you were missing two of your arguments
hehe I just made them up.
And as Vikhyat said you needed to name the class Game for your
initialization to work or you can keep the class name Games but put the
other one to Games too.
Running the code above should give you

Games:
FireProReturns--Playstation_2--Sports--Teen--Good--Agetec_Inc.--2000--Very_Good

--
There was a man, they called him mad.
The more he gave, the more he had.

Tim Hunter

3/22/2009 6:44:00 PM

0

Stefan Codrescu wrote:
> def to_s
> puts "Games:
> #{@title}--#{@platform}--#{@genre}--#{@rating}--#{@published_by}--#{@developed_by}--#{@year}--#{@condition}"
> end
> end
>
> game1=Game.new("FireProReturns","Playstation_2","Sports","Teen",
> "Good","Agetec_Inc.","2000","Very_Good")
> game1.to_s
>
>
> Is what I'm guessing you should have.
> You can put both of the methods in the same class.
> You forgot the 'puts' before the Games: in the to_s method

No, Daniel had it right. A class's #to_s method is expected to _return_
a string, not print a string. If you want to print the string
representation of a Game object, you would use

game1 = Game.new(....)
puts game1.to_s



--
RMagick: http://rmagick.ruby...

Daniel Dale

3/22/2009 8:12:00 PM

0

Thanks for all the help. I appreciate it. just had a thought though.
continuing the way I'm doing it now all the games I enter will be lost
when I close the program right ?

is there a way i can code it so the user is asked for the
title,rating,condition and etc of a game. when they put it in is
stored in a file with the rest of the games they input.
then they can sort them or list them by rating,platform,or genre.
--
Posted via http://www.ruby-....

poison tooth

3/22/2009 8:41:00 PM

0

[Note: parts of this message were removed to make it a legal post.]

Yes there is a way to do that...

class Game
def
initialize(title,platform,genre,rating,published_by,developed_by,year,condition)
@title=title
@platform=platform
@genre=genre
@rating=rating
@published_by=published_by
@developed_by=developed_by
@year=year
@condition=condition
@my_file =
File.new("/Users/Stefan/Ruby/yourfileorthenameofthefileyouwanttocreate.txt",
'a+')
end

def to_s
puts "Games:

#{@title}--#{@platform}--#{@genre}--#{@rating}--#{@published_by}--#{@developed_by}--#{@year}--#{@condition}"
end
def savedata
@my_file.puts "Games:

#{@title}--#{@platform}--#{@genre}--#{@rating}--#{@published_by}--#{@developed_by}--#{@year}--#{@condition}"
end
def printdata
file =
File.open("/Users/Stefan/Ruby/yourfileorthenameofthefileyouwanttocreate.txt")
file.each {|info| print info}
end
end

game1=Game.new("
FireProReturns","Playstation_2","Sports","Teen",
"Good","Agetec_Inc.","2000","Very_Good")
game1.to_s
game1.savedata
game1.printdata



the a+ means that it will create a new file and write to it or it will add
on to the end of that file if it already exists.
and I also added a method that will print the file that you made.
also note that since the file is in the a+ mode if you run the program 5
times for example you will have five entries even if they are all the same.

On Sun, Mar 22, 2009 at 2:11 PM, Daniel Dale <dochappy@gmail.com> wrote:

> Thanks for all the help. I appreciate it. just had a thought though.
> continuing the way I'm doing it now all the games I enter will be lost
> when I close the program right ?
>
> is there a way i can code it so the user is asked for the
> title,rating,condition and etc of a game. when they put it in is
> stored in a file with the rest of the games they input.
> then they can sort them or list them by rating,platform,or genre.
> --
> Posted via http://www.ruby-....
>
>


--
There was a man, they called him mad.
The more he gave, the more he had.

Pierre Pat

3/23/2009 1:22:00 AM

0

You could eventually use YAML or XML to store your data and get it back
later the way you want.
--
Posted via http://www.ruby-....

Daniel Dale

3/23/2009 6:21:00 AM

0

thanks for the example Stefan. it doesn't seem to ask the user to
input the information though but I'll be sitting down looking through
each line . great example to learn form so thanks for that.

Pierre , I've seen YAML mentioned else where but I haven't been able
to find any good documentation or tutorials on how to use it with ruby.



Pierre Pierre wrote:
> You could eventually use YAML or XML to store your data and get it back
> later the way you want.

--
Posted via http://www.ruby-....

Phlip

3/23/2009 12:57:00 PM

0

Daniel Dale wrote:

> Pierre , I've seen YAML mentioned else where but I haven't been able
> to find any good documentation or tutorials on how to use it with ruby.

That's syck!

Eric Jacoboni

3/23/2009 2:32:00 PM

0

Daniel Dale <dochappy@gmail.com> writes:

> Pierre , I've seen YAML mentioned else where but I haven't been able
> to find any good documentation or tutorials on how to use it with ruby.


What's wrong with "ri YAML" ?

Stefano Crocco

3/23/2009 2:46:00 PM

0

Alle Monday 23 March 2009, Eric Jacoboni ha scritto:

> What's wrong with "ri YAML" ?

In my opinion, it's not very informative. True, it does have a (very minimal)
example, but most of it is either very generic (the first part) or mostly
suited for people who already know how YAML works (the second part).

As for tutorials on YAML and ruby, you can look at the YAML for ruby cookbook
(http://www.yaml.org/YAML_for...). I found it extremely useful while
learning YAML. Also, YAML in Five Minutes
(http://yaml.kwiki.org/index.cgi?YamlInFiveMinute...), which is
mentioned in ri YAML, can be useful.

Stefano