Let's say we have a Movie model with "title" attribute and we would like to validate the title for empty brackets. For example: "Some text some text (some text) some text some text" #=> Valid title "Some text some text [some text] some text some text" #=> Valid title "Some text some text {some text} … Continue reading How to check for empty brackets in a string?
Hi guys! This time around I am going to show you how to implement Rails params completely from the ground up. As you probably already know, Rails has something called strong parameters. This is a security practice to prevent accidentally allowing users to update sensitive model attributes, for example "admin" flag in user model in … Continue reading How to implement Rails params from the ground up in Ruby?
Hi guys! This time I am going to show you how to implement your own Rails validations completely from the ground up. I will talk about validations briefly, I will show you a bit of Rails source code and then show you how you can implement your own Rails validations. In Rails, every model inherits … Continue reading How to implement Rails validations from scratch in Ruby
Let's say you have an application similar to Twitter where you have Users and Tweets and User 'has_many' tweets and Tweet 'belongs_to' user and you want to display how many Tweets a User has or how many people follow his Tweets. Typically, what you would do is query users and count their Tweets in by … Continue reading Rails counter cache
Have you ever wondered what the difference between 'and' and && operators is in Ruby? Check the example below. If you look at the line you might think that the user_name should be a String, but the error message clearly says that it is not a String, it's the Struct object. So how is this? … Continue reading Ruby “gotchas” – ‘and’ and &&
In the previous part I showed you how to create a cart, add products to it and how to keep products in user's cart so they can leave the session and come back at a later time and their products will still be in their cart. In this part I will show you how to … Continue reading Building a Shopping Cart in Ruby on Rails (Part 2)
