Passing method name to method?

[Arfon Smith]

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

 

[Logan Capaldo]

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_paramparam)

 

[Austin Ziegler]

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.

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_paramfoo)
puts id if id
end

-austin

 

[Arfon Smith]

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_paramparam)

It works!

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