Refactoring our Rails app out of single-table inheritance

James Coglan, a Developer at FutureLearn, explains a common problem with STI and how we refactored our Rails app to solve it. Single-table inheritance (STI) is the practice of storing multiple types of values in the same table, where each record includes a field indicating its type, and the table includes a column for every field of all the types it stores. In Rails, the type column is used to det