Sometimes in a Ruby on Rails application, we might have a foreign key constraint defined in production database but there may not be a migration file for this. If we add a migration file with add_foreign_key step, then that migration will run…
In Ruby on Rails, we use destroy_all when we want to delete a collection of ActiveRecord::Relation records. Example: As we notice above in the logs, all the records were loaded into the memory at a time and then DELETE transaction was initiated for…
Ruby on Rails has update_all class method which is used to update a batch of records without running validations and callbacks defined in the model. On the contrary, we can update batch of records using update class method which also runs validations…
Rails 7 introduced a new method to ActiveRecord::Base called previously_persisted?. This method checks whether a deleted ActiveRecord instance was previously existing in database. Let's see this method in action: previously_persisted? method is just…
Rails has several finder methods like find, find_by, last, first, etc. in ActiveRecord to query the database to find a single record. Let's understand how we use find_by or first methods with the help of an example. If we are asked to update a…
While working on a Ruby project at times we may need to find whether two arrays have any common items. In Ruby '&' operator is popularly used for this. Let's quickly look at an example. Ruby 2.7.0 introduced Array#intersections which helped us to…
In past, Ruby had made some of the objects frozen by default and those were the objects of Symbol, Integer, Float, TrueClass, FalseClass, NilClass, etc. Ruby core team has been very cautious in past while making any object frozen to ensure these…
In Ruby, frozen_string_literal: true makes all string literals frozen by default and it helps in reducing needless memory allocations by not creating a new allocation each time a string is redefined. In Ruby 2.7.1 and earlier versions, interpolated…
Before Ruby 2.7.0, there was no shorthand syntax to delegate method arguments to another method. We had to catch all type of arguments (positional, keyword, block) and then we were passing it to the right method. Let's see this example: The above…
Ruby 2.7.0 introduced a shorthand syntax to forward arguments to another method. Although ... is a nice addition to Ruby 2.7.0 but it does not help if we want to be little selective like catching one argument and passing the rest to another method…
In Ruby, symbols are immutable and strings are mutable. If we define a symbol once, then a single memory location is referred everywhere. In short, symbols help us to reduce memory allocations. Rubyists use symbols and strings interchangeably in…
Before Ruby 2.7.0, we were able to call private attr_writer method using self but were getting an error while calling a private attr_reader method and any other private method. Let's see an example: Before Ruby 2.7.0, the above example would throw an…
Note: This article is all about behavior of Keyword Arguments from Ruby 2.0 to 2.6.6 (latest version of 2.6 release). Keyword Arguments were introduced in Ruby language with version 2.0 and it has been used extensively across many projects because…
Today, we are thrilled to announce the launch of scriptday blogs. The objective of adding the blog section is to share our day to day learnings and experiences with the world. Our blogs will also share recent updates that is happening in engineering…