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Partials and helpers are the standard methods to extract reusable functionality. For larger HTML code, partials can be used to split into smaller logic parts. Partials are used for side-menu, header etc. Views are in charge of displaying information only. The concept of object-oriented programming paved the way for design patterns and refactoring patterns such as service objects and also decorators and presenters.

Decorator patterns enable us to attach additional responsibilities to an object dynamically, without affecting other objects of same class. The main difference between them is how they extract logic out of the view. Presenters are very close to the view layer, while decorators are some more broad concept. Anyway, try to avoid helpers and concerns as much as possible, if you want to make objects easier to test, then Plain Ruby Objects are easier to test than helpers and concerns which are tied to Rails.


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Always keep the minimum amount of code in helpers and move as much logic as possible into POROs. I am Nimmy, a part time blogger and tech enthusiast. I write posts about things I'm working on, specifically on web development.

I like to help people in my niche by sharing my experience and knowledge. Skip to content. Refactoring in Rails.


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If we run the tests, they will pass. Additionally we will need the exam to contain the data for the student which has taken the exam. Some of you might think that a student should be a separate object and I would say that you are right. Also, others might say that there can be separate classes for a failed and passed exams. But, for this example we can keep it really simple. Did you think about what we did in this step? We first wished what the interfaces of our classes should be and then we created the first class, using TDD.

That would be it at this moment. The Exam holds enough behaviour and data so we can continue with the other classes. The next step is the ExamMailer. The mailer should contain only the behaviour required to send the emails - nothing else. As we decided in the first step, the mailer will have two methods: ExamMailer.

Premature optimization is the root of all evil.

In the beginning of the file, we set the delivery method of the Mail gem to be :test. This means that the gem will hold all of the emails that are sent in memory, without trying to make an actual delivery. Also, in our setup method we invoke the Mail::TestMailer. This is done so we have a fresh collection of sent emails for each test, which helps with avoiding any confusion.

As you can notice in the tests, we assert on the recipient email, on the e-mail subject and on the e-mail body.

Refactoring Ruby Ed.

With this step, we want to make sure that the most essential parts of the e-mail recipient, body and subject are correct. It builds a new Mail object and delivers it. As you saw in this step, we extracted the mailing logic from the script to a new well-defined class. The next and last step is reviewing the original Parser class and pondering a bit with it.

Refactoring: Clean your ruby code with design patterns

After we did all of the hard work around extracting two new classes and writing tests for them, it is time to take a look at the Parser class. Sometimes you have a big method that got out of control. In this case it might be hard to refactor because big methods tend to have many local variables. One solution is to use the 'Method Object' refactoring.


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To perform the refactoring we can create a new class and promote the local variables into instance variables. This will allow us to further refactor this code without having to worry about passing data around.