How to associate descendant models to a parent.

Programmer Question

Hi, I have the following models:

Account
  has_many :libraries

Library
  has_many :topics
  belongs_to :account

Topic
  has_many :functions
  belongs_to :library

Function
  has_one :example
  belongs_to :topic

Example
  belongs_to :function

I would like to be able to able to do things such as:

some_account.libraries
some_account.topics
some_account.functions
some_account.examples

In addition, I would like to be able to assign an account to a descendant, i.e

some_example.account = some_account
some_function.account = some_account
some_topic.account = some_account
some_library.account = some_account

To give some context:
I am letting a user (Account) create each Library, Topic, Function, Example. record separately. Then a user is free to change how the records are associated: Change the topic of a Function, move a Topic to a different Library, add an example to a function, and so on.

To my understanding no matter what record is created, I would need to assign it to a user (account) so that I can have a list of each Model records that a user has created, as well as prevent other users from seeing stuff that doesn't belong to them

Although I might be overcomplicating, I really don't know :(

Thanks in advance.

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