ruby on rails - How can I get instance method parameters? -

i'm trying retrieve parameters couple instance methods. idiomatic ruby way so:

class   def test(id)     puts id   end end  a.instance_method(:test).parameters  #=> [[:req, :id]] 

this approach works of time, strange returns methods , have no idea why.

module events   class repository     def find(id)       #code     end     def delete(id)       #code     end   end end  events::repository.instance_method(:find).parameters #=> [[:req, :id]]  events::repository.instance_method(:delete).parameters #=> [[:rest, :args], [:block, :block_for_method]] 

is ruby bug?

note: i'm typing above rails console.

i don't know why getting behavior, if answer questions earlier comment can figure out.

however, answer question can not bug in ruby. here example of small ruby program give same kind of output getting:

module x   def delete(*args, &block)   end end  class y   prepend x end      class y   # reopen existing class   def delete(x)   end end  p y.instance_method(:delete)   # => #<unboundmethod: y(x)#delete> p y.instance_method(:delete).parameters # => [[:rest, :args], [:block, :block]]