Chapter 7. Advanced entity association mappings

When we use the word associations, we always refer to relationships between entities. In the previous chapter, we demonstrated a unidirectional many-to-one association, made it bidirectional, and finally turned it into a parent/children relationship (one-to-many and many-to-one with cascading options).

One reason we discuss more advanced entity mappings in a separate chapter is that quite a few of them are considered rare, or at least optional.