ruby on rails - ActiveRecord relationships and the object model -

hi ran when trying following:

posts = user.first.posts posts.find {|p| "p.id" == 123} => activerecord::recordnotfound: couldn't find post without id 

that trying call activerecord find. it's expecting:

posts.find(123) 

but dont want query db again. need do:

posts.to_a.find {|p| "p.id" == 123} 

i though dealing array, according posts.class. why have call to_a on it?

posts.class => array posts.superclass => activerecord::base 

why can call superclass on posts if it's (presumably) instance of array , why return activerecord::base?

also:

posts.ancestors.include? activerecord::base => false 

why false if activerecord::base superclass of posts array?

one more. if do:

posts.instance_methods(false) 

it returns instance methods of class of relationship, i.e. post. seems weird since posts array. if create "regular" array:

a = [1, 2] a.instance_methods(false) => nomethoderror: undefined method `instance_methods' [1, 2]:array 

so array returned via activerecord relationship query sort of array not...it seems inherits activerecord, doesn't...or something. when thought getting solid grasp of ruby object model :) maybe under-the-hood @ activerecord help. i'm not sure, that's why i'm asking guess.

this curiosity thing. help/guidance appreciated

you want:

posts.detect {|p| p.id == 123} 

find alias of detect, shadowed find method on activerecord collection proxy posts.