Executing ruby code stored as a string in a database

ruby-talk
1

I'm trying to retrieve some ruby code from a database as a string, I
would then like to execute this code. So far I've tried many approaches
but my latest uses define_method.

I have a method defined to use define_method, i.e.

    def define_validation_method(name, &block)
      self.class.send(:define_method, name, &block)
    end

What I would like to do is pass the code that I want executed to this
method as an example:

function_module = define_validation_method(
  :validate_object)
"do |x, y, z|
  if x > 1
   x = y + z
  else
   x = y - z
  end
end"

This of course does not work as the method expects a block not a string.
Can anyone suggest how to get this method to work, or suggest another
method. The code is being executed within a ruby class.

Thanks.

···

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

2

Hi
have you tried with class_eval? when you have to execute ruby code contained
in a string it should be fine for you

def define_validation_method(name, method_body)
        self.class.class_eval("

        def #{name}
                #{method_body}
        end

")
end

Hope this helps
Tom

Etienne Van tonder wrote:

···

I'm trying to retrieve some ruby code from a database as a string, I
would then like to execute this code. So far I've tried many approaches
but my latest uses define_method.

I have a method defined to use define_method, i.e.

    def define_validation_method(name, &block)
      self.class.send(:define_method, name, &block)
    end

What I would like to do is pass the code that I want executed to this
method as an example:

function_module = define_validation_method(
  :validate_object)
"do |x, y, z|
  if x > 1
   x = y + z
  else
   x = y - z
  end
end"

This of course does not work as the method expects a block not a string.
Can anyone suggest how to get this method to work, or suggest another
method. The code is being executed within a ruby class.

Thanks.