• Build two classes that have a has-many/belongs-to relationship
• Describe different kinds of relationships
• talk about file structure (a bit of a tangent)

"Even objects have relationships?" - Neivy's sister "Yes." "What do we mean? How objects relate or communicate with each other. How they're connected." - Wendy

• has_one example: typically, "A husband has one wife" (The opposite is also true)
• has_many one object "has many" of another...
  • a has_many is complemented by either a belongs_to or has_many
• a has_many/belongs_to relationship, also called "one to many", is what we're going to talk about today

Can we think of a real-world one-to-many relationship?

• rabbit/carrots
• library/books
• teacher/students
• leader/followers

To make this work, we will establish:

• A library class
• A book class

We need to consider both sides of a relationship. As we add a book to a library's collection, for example, we also need to add the library to the book. And vice versa.

In this code we now have a very basic example of a has-many/belongs-to relationship. This is the very tiny tip of a rather large iceberg that we will be exploring much further in mod 2. Going forward, we will focus on the project.