Add note about inheretance and poly associations.
This note came about due to discussion in #6786.
|@@ -338,6 +338,10 @@ end|
|!images/polymorphic.png(Polymorphic Association Diagram)!|
|+Polymorphic associations can get tricky with inheritance. If you need|
|+an inheritance relationship in your ActiveRecord models, you should use|
|+Single Table Inheritance instead.|
|h4. Self Joins|
|In designing a data model, you will sometimes find a model that should have a relation to itself. For example, you may want to store all employees in a single database model, but be able to trace relationships such as between manager and subordinates. This situation can be modeled with self-joining associations:|