ERB "undefined local variable or method"

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May 18th, 2007, 10:01 PM

lotus_anima

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ERB "undefined local variable or method"

Here is a snippet of my Ruby...

Code:

  def serve_html(sock)
    browser = sock
    
    template = ERB.new(load_template_as_string('test.rhtml'), 0, '%<>')
    send_this = "Hello, world!"
    
    
    browser.write("HTTP/1.0 200 OK\r\nContent-type: text/html\r\n\r\n")
    browser.write(template.result)
    
    close_socket(sock)
  end

And here is a snippet from test.rhtml...

Code:

<body><%= send_this %></body>

But I get...

Code:

(erb):10: undefined local variable or method `send_this' for main:Object (NameError)

What gives? Mine is nearly identical to the ERB docs.

May 27th, 2007, 09:13 AM

voipfc

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Join Date: Oct 2006

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listing

PHP Code:


		
			
require 'erb'



  def serve_html(file)



    send_this = "Hello world 2"

    data = File.read(file)

    template = ERB.new(data, 0, '%<>')

    send_this = "Hello, world 3!"



    puts send_this

    puts("HTTP/1.0 200 OK\r\nContent-type: text/html\r\n\r\n")

    puts(template.result)





  end

send_this="Hello world 1!"

serve_html('test.rhtml')

execution

Quote:

Hello, world 3!
HTTP/1.0 200 OK
Content-type: text/html

<body>Hello world 1!</body>

Comment out the send_this="Hello world 1" at the end of the listing and the error will appear. It appears that when the puts is xecuted template.result is out of scope.

It has something to do with bindings - I am new to ruby - don't ask me why.

This is what I used to get your code to work. It involves something known as bindings and is in the ERb examples

PHP Code:


		
			
require 'erb'



  def serve_html(file)

    b = binding

    send_this = "Hello world"

    data = File.read(file)

    template = ERB.new(data, 0, '%<>')



    puts("HTTP/1.0 200 OK\r\nContent-type: text/html\r\n\r\n")

    puts(template.result(b))





  end

serve_html('test.rhtml')

Note the bracketed (b) in the template.result call.

July 13th, 2011, 10:02 AM

rubyist

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Instance variable

Even if this thread isn't that new, it may help some other users:
Ruby separates between local and instance variables by the given name. Local variables start with a letter or often with a '_' and can be addressed only within the class. Instance variables start with the '@'-symbol and can be addressed from outside the class. So try it with an '@send_this' (both in the controller and in the view) and it should work.

July 13th, 2011, 10:55 AM

IMP1

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Quote:

Originally Posted by rubyist

Even if this thread isn't that new, it may help some other users:
Ruby separates between local and instance variables by the given name. Local variables start with a letter or often with a '_' and can be addressed only within the class. Instance variables start with the '@'-symbol and can be addressed from outside the class. So try it with an '@send_this' (both in the controller and in the view) and it should work.

When rubyist says "class", he means "method or block". Instance variable are available throughout the class.

ERB "undefined local variable or method"

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