Ruby types of collections in ActiveRecord
- by kmorris511
If I have an object with a collection of child objects in ActiveRecord, i.e.
class Foo < ActiveRecord::Base
has_many :bars, ...
end
and I attempt to run Array's find method against that collection:
foo_instance.bars.find { ... }
I receive:
ActiveRecord::RecordNotFound: Couldn't find Bar without an ID
I assume this is because ActiveRecord has hijacked the find method for its own purposes. Now, I can use detect and everything is fine. However to satisfy my own curiousity, I attempted to use metaprogramming to explicitly steal the find method back for one run:
unbound_method = [].method('find').unbind
unbound_method.bind(foo_instance.bars).call { ... }
and I receive this error:
TypeError: bind argument must be an instance of Array
so clearly Ruby doesn't think foo_instance.bars is an Array and yet:
foo_instance.bars.instance_of?(Array) -> true
Can anybody help me with an explanation of this and of a way to get around it with metaprogramming?
