The method presence_in, which is part of ActiveSupport, is used to check if a value is present in a given collection and returns the value if it is present; otherwise, it returns nil. However, it can also raise an ArgumentError if the argument does not respond to the include? method. In this blog post, we will explore the presence_in method, how it works, and common pitfalls to avoid.
Polymorphic associations in Ruby on Rails are a powerful feature that allows a single model to belong to multiple other models using a single association. This is particularly useful when you have a model that can be associated with more than one other model type, without having to specify the model types directly.
Among the essential methods within migrations are self.up and self.down, which are used to define the actions to be performed when migrating up (applying changes) or down (rolling back changes) respectively. In this blog post, we’ll explore the purpose of self.up and self.down, when they are used, and provide examples to illustrate their usage.
In the world of Ruby on Rails development, ensuring data integrity is paramount for building high-quality applications. When dealing with associations between models, it’s essential to retrieve only unique records to maintain accuracy and reliability. Ruby on Rails offers a powerful solution to this challenge through the distinct method, which can be directly applied to models to enforce uniqueness. Let’s explore the concept of distinct in Rails models, its practical applications, and how it contributes to data integrity using a real-world example.
In the world of Ruby on Rails development, mastering the intricacies of layout rendering is essential for building dynamic and engaging web applications. One fundamental concept that every Rails developer encounters is the yield keyword. In this blog post, we’ll explore the significance of yield in Rails layouts and views, its role in rendering content dynamically, and how it enhances the flexibility and modularity of Rails applications.
In the realm of web security, Cross-Site Request Forgery (CSRF) stands as a prominent threat, capable of compromising the integrity and confidentiality of web applications. In this blog post, we’ll delve into what CSRF is, how it can be exploited, and how Ruby on Rails provides built-in protections against this vulnerability.
Setting up a Rails application to work with multiple databases requires careful configuration and consideration. In this guide, we’ll walk through the steps to configure your application for multiple databases, using an example scenario involving a primary database and a secondary database for books.
In Ruby, the compact method is a handy tool when dealing with arrays containing nil values. Let’s delve into its functionality through a practical example:
Ruby on Rails (Rails) is a powerful web development framework known for its robust features and elegant design principles. In this blog post, we’ll delve into some of the core features that make Rails a preferred choice for building web applications.
In the world of Ruby on Rails, mastering **args can unlock a new level of flexibility when handling variable method arguments. **args, short for double splat arguments, allows methods to accept an arbitrary number of named arguments, providing a powerful tool for building more dynamic and adaptable code. Let’s explore **args by comparing a method that utilizes it versus one that doesn’t, showcasing the benefits of this convention.
When it comes to extracting data from your database for export or analysis, Ruby on Rails’ ActiveRecord library offers the powerful pluck method to streamline the process.
It’s common when adding images to an email to use the image_tag function like this:
Are you building a Rails application and need to allow users to select days of the week in a form? Rails 7 offers an elegant solution for that with the weekday_options_for_select method. In this article, we’ll explore how to use this method, along with detailing its options and providing practical examples to get you started.
The only_numeric validation, introduced in Rails 7, empowers developers to enforce stricter constraints on model attributes. This ensures that only numeric values are accepted, improving data integrity in various scenarios. Imagine collecting phone numbers or product quantities – only_numeric guarantees user input adheres to the expected format.
Timestamps are a crucial part of any data model, helping track when records were created or modified. ActiveRecord provides convenient methods to manage timestamps: touch and touch_all.
In Rails, the link_to helper is used to generate HTML links. But what if you want a link to only appear if the current page isn’t the one it points to? That’s where link_to_unless_current comes in.
Delegating methods in Ruby on Rails can greatly streamline your code, especially when dealing with associations between objects. One particularly handy method for achieving this is delegate_missing_to. Let’s delve into how it works and explore some examples.
In Ruby on Rails, there are a number of time helpers that can be used to format and manipulate dates and times. We selected a few ones you might not know that can be used to make your code more readable and to provide a better user experience.
Generating URLs within Rails applications can involve specifying parameters for various routes. Prior to Rails 7.1, dealing with scoped routes presented a minor challenge.
ActiveSupport::StringInquirer is a class provided by Rails’ ActiveSupport module that can streamline your code and make it more readable. Let’s dive into what ActiveSupport::StringInquirer is and how it can improve your Ruby on Rails development experience.
In Ruby on Rails, concerns are modules that encapsulate common behaviors that can be shared among different model classes, controllers, or other components of the application. Concerns are used to avoid code repetition and maintain code modularity and organization.
Managing arrays is a common and essential task and when it comes to filtering elements based on specific criteria, a variety of methods are at our disposal. In this post, we’ll highlight some well-known methods along with others that might be less familiar in the Ruby world.
Rails 7.1 introduces a significant enhancement to enum handling through the introduction of the :validate option.
Building performant web applications is crucial so while Rails provides a robust framework, optimizing every piece of code is essential for a smooth user experience. This is where memoization comes in, a powerful technique to enhance your Rails app’s speed and efficiency. In scenarios with frequent database queries, it’s a straightforward yet impactful technique for boosting overall performance.