From: Rail Shafigulin <rail.shafigulin@...>
Date: 2010-12-21T11:18:37+09:00
Subject: Re: creating an object

Johnny M. wrote in post #969685:
>> rating = Rating.new(:rating => params[:rating])
>>
>> i can't understand what it means.
>
> It's just a regular call to Rating.new, but it's using the special
> syntax for sending a hash as an argument.
>
> :rating is a symbol, used as the key in the hash.  It refers to
> params[:rating].
>
> Try playing with this in irb
>
> # Tested with ruby 1.9.2
> # Lets see what food is in the fridge!
> def peek fridge
>    puts "fridge was a #{fridge.class}"
>    puts "The cheese was: #{fridge[:cheese]}"
>    puts "The vegetable was: #{fridge[:vegetable]}"
> end
>
> # This is closer to the code in your problem
> peek(:cheese => :cheddar, :vegetable => :leeks)
>
> # But you can do it with hands free syntax too!
> peek :cheese => :brie, :vegetable => :broccoli
>
> Read about this in the pickaxe
> http://ruby-doc.org/docs/ProgrammingRuby/html/tut_methods.html#UE
>
> (or as more uncouth elements may say, RTFM)
>
> Johnny
>
> P.S. Whoever wrote that piece of code seems to really like the word
> rating.

i understood that it was a hash, but i couldn't figure what is going to
happen when we pass a hash to the new method. i couldn't find the
initialize method in the class definition.

i tried the following code in irb but i received an error

class SomeClass
end

s = SomeClass.new(:rating => params[:rating])

does it mean that i simply initialize is defined somewhere else since i
received an error?

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