Migration Class and File naming

When running rake migrate I recently faced this output:

 C:\work>rake migrate
 (in C:/work)
 rake aborted!
 uninitialized constant CreateFooTable

 (See full trace by running task with --trace)

 C:\work>

Not the most informative message in the world. Running with trace didn't really help me out either. The error I made, on it's own, is fairly easy to spot, but I was also trying to load records of type Foo in this migration. Because I was trying to load records, I thought perhaps the error was occurring in the local definition of the Foo class.

Unfortunately, I missed the simple mistake. I had renamed the class to CreateFoosTable, because in Rails table names are plural.

Match the file name with the class name and everything works fine. A simple mistake that hopefully now we can both easily avoid in the future.