Given the guidance to minimize the logic in views and controllers, the only place left in an MVC architecture to put all that logic would be in the models, right? You can then add methods into this object to perform logical operations that you might otherwise have put into your view code.Ĭommon Mistake #3: Putting too much logic in the model Use presenters/decorators like the Draper gem to encapsulate view-building logic in a Ruby object.Use view layouts and partials appropriately to encapsulate things that are repeated on your pages.This would then enable you to replace the previous view code example with this one simple line of code: Welcome, Ī couple of additional recommended Rails best practices: For instance, you might define the current_user helper in app/controllers/application_controller like this: require 'ostruct'ĭef ||= User.find session if session Often, there will end up being conditional logic structures like this in view files: Ī better way to handle something like this is to make sure the object returned by current_user is always set, whether someone is logged in or not, and that it answers the methods used in the view in a reasonable way (sometimes referred to as a null object). As a simple example, consider a case where we have a current_user method available that returns the currently logged in user. One is overuse of conditional logic in views. This can manifest itself in a number of ways. This is also an area that can lead to lots of repetition, leading to violations of DRY (don’t repeat yourself) principles. However, if you’re not careful, you can soon end up with a large file that is a mix of HTML and Ruby code that can be difficult to manage and maintain. The out-of-the-box Rails templating engine, ERB, is a great way to build pages with variable content. Common Mistake #2: Putting too much logic in the view While this still pushes the limits of the single responsibility principle, it’s sort of the bare minimum that the Rails framework requires us to have in the controller. Rendering the result (html, xml, json, etc.) or redirecting, as appropriate. Gathering request parameters and calling an appropriate model method to persist them. Ideally this should be a call to a single find method setting an instance variable to be used later to render the response. Logic for finding the right model object given the parameters passed in from the request. This might also include authentication/authorization or any additional cookie processing you need to do. Generally, the only types of logic you should have in your controller are: The problem is that the controller object will start to violate the single responsibility principle making future changes to the code base difficult and error-prone. It’s all too easy to move view logic (which is better housed in a helper), or domain/model logic, into the controller. In the Rails community, we’ve been talking about fat model, skinny controller for a while now, yet several recent Rails applications I’ve inherited violated this principle. Common Mistake #1: Putting too much logic in the controller This tutorial looks at 10 common Rails problems, including how to avoid them and the issues that they cause. It can also have undesirable ramifications with regard to security and performance.Īccordingly, while Rails is easy to use, it is also not hard to misuse. Most notably, the “magic” that happens behind the scenes in the framework can sometimes lead to headfakes, confusion, and “what the heck is going on?” types of problems. While this paradigm has its advantages, it is also not without its pitfalls. Simply put, this means that, by default, Rails assumes that its expert developers will follow “standard” best practice conventions (for things like naming, code structure, and so on) and, if you do, things will work for you “auto-magically” without your needing to specify these details. Rails is built on the principle of convention over configuration. Ruby on Rails (“Rails”) is a popular open source framework, based on the Ruby programming language that strives to simplify and streamline the web application development process.
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