Since controllers sit at the barrier between the user and the domain, and often applications have more than one way of executing the same task, you risk having duplication across each entry path.

When Henry refused to leave a tunnel, the story says that "A fat director, who was on the train, told the guard to get a rope". As is well known in the fandom, but not by society there have been three Fat Controller’s over the course of the Railway Series. It’s worth noting at this point that the Fat Controller’s scolding is not merely just their to reprimand the engines for their action but for them to understand the mistake they made, not make it again and learn from it.The Ruby on Rails community was right to step away from fat controllers but we did it in the wrong way. A very disciplined man with a very high moral code, known for getting firm and strict with his engines when they act out, but also praises them when they are heroes and does his best to protect them from harm. So views only receive data, and offer to the user links/forms to post the data to a controller, but they don't elaborate anything. By the end of this book though, Awdry had a bit of a revelation, he realised portraying a comedic character would eventually become boring and lack story potential.

The problem is, as always with the fandom, once this idea becomes fact, they start looking back and pointing at other instances that they think Sir Topham Hatt was unfair or dicky. That’s why the engines are always upset when he reprimands them for their selfish careless acts, not just because it’s wrong and embarrassing, but because they feel like they’ve let him down, a man who’s given them everything they could want. If it isn’t clear why you could benefit from biz-logic-free controllers, you may be missing some software design fundamentals that could make a boatload more sense after you read this article. I’ve changed my stance a bit on reusability, where I used to think it was a great thing to strive for in all cases, now – not so much.But I think what makes his character downfall more unique than anyone is it’s really a reflection fo the world we live in. The Fat Controller, whose real name is Sir Topham Hatt, is a fictional character in The Railway Series books written by Reverend W. In the first story when Gordon gets depressed, he immediately sends for Flying Scotsman, Gordon’s only surviving brother, who actually tells Gordon, “you are lucky Gordon to have a controller that knows how to run railways“.