Passing method name to method?

ruby-talk
1

Hi, sorry if this isn't phrased quite as it should be!

I want to have a generic 'find' method that can check to see if an
object's attribute is true or false.

Basically I want to pass the method name (param) to the list_by_param
method but this doesn't seem to be working (I get an undefined local
variable or method 'param' for main:Object) error.

def list_by_param(param)
  puts "#{object.id}" if object.param == true
end

puts objects.list_by_param(param)

Any idea where I'm going wrong?

Thanks

···

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2

Hi, sorry if this isn't phrased quite as it should be!

I want to have a generic 'find' method that can check to see if an
object's attribute is true or false.

Basically I want to pass the method name (param) to the list_by_param
method but this doesn't seem to be working (I get an undefined local
variable or method 'param' for main:Object) error.

def list_by_param(param)
puts "#{object.id}" if object.param == true
end

puts objects.list_by_param(param)

I *think* what you are trying to do is

def list_by_param(param)
  puts "#{object_id}" if object.send(param) == true
end

puts objects.list_by_param(:param)

···

On 9/28/07, Arfon Smith <arfon.smith@gmail.com> wrote:

Any idea where I'm going wrong?

Thanks
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3

class Object
  def objid_if_param(param)
    "#{self.__id__}" if self.__send__(param) == true
  end
end

class Foo
  attr_accessor :foo
end

bar = Foo.new
baz = Foo.new
baz.foo = true

[ bar, baz ].each do |ob|
  id = ob.objid_if_param(:foo)
  puts id if id
end

-austin

···

On 9/28/07, Arfon Smith <arfon.smith@gmail.com> wrote:

I want to have a generic 'find' method that can check to see if an
object's attribute is true or false.

Basically I want to pass the method name (param) to the list_by_param
method but this doesn't seem to be working (I get an undefined local
variable or method 'param' for main:Object) error.

--
Austin Ziegler * halostatue@gmail.com * http://www.halostatue.ca/
               * austin@halostatue.ca * You are in a maze of twisty little passages, all alike. // halo • statue
               * austin@zieglers.ca

4

Logan Capaldo wrote:

···

On 9/28/07, Arfon Smith <arfon.smith@gmail.com> wrote:

puts "#{object.id}" if object.param == true
end

puts objects.list_by_param(param)

I *think* what you are trying to do is

def list_by_param(param)
  puts "#{object_id}" if object.send(param) == true
end

puts objects.list_by_param(:param)

It works!

Thanks. So I have to pass a symbol to the method to get this to work?
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