Comments on: “AkitaOnRails” On Ruby Symbols

By: Abdul Basit

Abdul Basit — Wed, 19 Oct 2011 10:48:54 +0000

Hi Koti,
the methods like before_filter accepts parameter in string format(as symbols are special type of string)

Using eval() method, it is possible to execute the methods, by giving the method name as a string.

eval() can also be used to execute ActiveRecord methods.

eg,

model_name = “user”
method_name = “find_by_name”
eval(model_name.capitalize + ‘.’ + method_name +’ India’) # this is same as Country.find_by_name(‘India’)
—————————————

The explanation is not for, how before_filter is doing this. But this is one way for doing the same.

By: koteswara rao

koteswara rao — Sat, 13 Aug 2011 12:50:20 +0000

Hi sir,i’m koti.i just came to know ruby.You explained well.But there is a little bit confusion to use symbols.You said that we can use symbols instead of strings.But i saw so many methods using symbol like this
before_filter :add_to_numbers
actually here add_to_numbers is a method but the method added with colon(:).so if we add colon to method,then what is meaning of that method included with colon?
could you clarify my doubt please

By: Nicholaus Hughes

Nicholaus Hughes — Tue, 10 May 2011 00:13:00 +0000

Awesome. Clear and Concise.

I appreciate a simple explanation about something that doesn’t need to be complicated.

By: rahul

rahul — Wed, 22 Dec 2010 13:08:34 +0000

The concept was presented in clear words and precise text.
I have a question here, in the rails world, there are many symbols that are being used. As a first time learner, how do i know which symbols are available?

By: emmanuel delgado

emmanuel delgado — Wed, 20 Oct 2010 13:28:17 +0000

http://bit.ly/6zCTH is a great ruby symbols explanation, reading and understanding it is a must for every ruby beginner