Ruby 2.5 adds Exception#full_message method
Before Ruby 2.5, if we want to log a caught exception, we would need to format it ourselves. 1class AverageService 2 attr_reader :numbers, :coerced_numbers 3 4 def initialize(numbers) 5 @numbers = numbers 6 @coerced_numbers = coerce_numbers 7 end 8 9 def average 10 sum / count 11 end 12 13 private 14 15 def coerce_numbers 16 numbers.map do |number| 17 begin 18 Float(number) 19 rescue Exception =>
Rails 5.2 specifying default value for class_attribute
It is very common to set a default value for a class_attribute. Before Rails 5.2, to specify a default value for a class_attribute, we needed to write like this. 1class ActivityLogger 2class_attribute :logger 3class_attribute :settings 4 5self.logger = Logger.new(STDOUT) 6self.settings = {} 7endCopy As we can see above, it requires additional keystrokes to set a default value for each class_attrib
Ruby 2.5 allows creating structs with keyword arguments
In Ruby, structs can be created using positional arguments. 1Customer = Struct.new(:name, :email) 2Customer.new("John", "john@example.com")Copy This approach works when the arguments list is short. When arguments list increases then it gets harder to track which position maps to which value. Here if we pass keyword argument then we won't get any error. But the values are not what we wanted. 1Custo
Ruby 2.5 enumerable predicates accept pattern argument | BigBinary Blog
Ruby 2.5.0 was recently released. Ruby has sequence predicates such as all?, none?, one? and any? which take a block and evaluate that by passing every element of the sequence to it. 1if queries.any? { |sql| /LEFT OUTER JOIN/i =~ sql } 2logger.log "Left outer join detected" 3endCopy Ruby 2.5 allows using a shorthand for this by passing a pattern argument. Internally case equality operator(===) is
Ruby 2.5 added yield_self | BigBinary Blog
Ruby 2.5 added a new method named yield_self. It yields the receiver to the given block and returns output of the last statement in the block. 1irb> "Hello".yield_self { |str| str + " World" } 2 => "Hello World"Copy How is it different from try in Rails ? Without a method argument try behaves similar to yield_self. It would yield to the given block unless the receiver is nil and returns the output
Rails 5.2 fetch_values for HashWithIndifferentAccess
Ruby 2.3 added fetch_values method to hash. By using fetch_values we are able to get values for multiple keys in a hash. 1capitals = { usa: "Washington DC", 2 china: "Beijing", 3 india: "New Delhi", 4 australia: "Canberra" } 5 6capitals.fetch_values(:usa, :india) 7#=> ["Washington DC", "New Delhi"] 8 9capitals.fetch_values(:usa, :spain) { |country| "N/A" } 10#=> ["Washington DC", "N/A"]Copy Rails
Ruby 2.5 added delete_prefix and delete_suffix methods
Ruby 2.4 Let's say that we have a string Projects::CategoriesController and we want to remove Controller. We can use chomp method. 1irb> "Projects::CategoriesController".chomp("Controller") 2=> "Projects::Categories"Copy However if we want to remove Projects:: from the string then there is no corresponding method of chomp. We need to resort to sub. Naotoshi Seo did not like using regular expressio
Graceful shutdown of Sidekiq processes on Kubernetes
In our last blog, we explained how to handle rolling deployments of Rails applications with no downtime. In this article we will walk you through how to handle graceful shutdown of processes in Kubernetes. This post assumes that you have basic understanding of Kubernetes terms like pods and deployments. Problem When we deploy Rails applications on kubernetes it stops existing pods and spins up new
Deploy Rails apps on Kubernetes cluster & no downtime
This post assumes that you have basic understanding of Kubernetes terms like pods and deployments. Problem We deploy Rails applications on Kubernetes frequently and we need to ensure that deployments do not cause any downtime. When we used Capistrano to manage deployments it was much easier since it has provision to restart services in the rolling fashion. Kubernetes restarts pods directly and any
Rails 5.1 dropped jQuery dependency in default stack
Rails has been dependent on jQuery for providing the unobtrusive JavaScript helpers such as data-remote, data-url and the Ajax interactions. Every Rails application before Rails 5.1 would have the jquery-rails gem included by default. The jquery-rails gem contains the jquery-ujs driver which provides all the nice unobtrusive features. But now JavaScript has progressed well such that we can write t
Rails 5.1 has introduced Date#all_day helper
Sometimes, we want to query records over the whole day for a given date. 1>> User.where(created_at: Date.today.beginning_of_day..Date.today.end_of_day) 2 3=> SELECT "users".* FROM "users" WHERE ("users"."created_at" BETWEEN $1 AND $2) [["created_at", 2017-04-09 00:00:00 UTC], ["created_at", 2017-04-09 23:59:59 UTC]]Copy 1>> User.where(created_at: Date.today.all_day) 2 3=> SELECT "users".* FROM "us
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Ruby 2.5 added Hash#slice method
Rails 5.2 supports descending indexes for MySQL
Array#prepend and Array#append in Ruby 2.5
Ruby 2.5 introduces Dir.children and Dir.each_child
Ruby 2.5 allows rescue/else/ensure inside do/end blocks
Rails 5.2 adds expiry option for signed and encrypted cookies and adds relative expiry time | BigBinary Blog
Ruby 2.4 deprecated constants TRUE, FALSE & NIL
Binding irb - Runtime Invocation for IRB
Ruby 2.4 has default basename for Tempfile#create