Notes About Development

Search This Blog

Git Aliases

November 07, 2017

Get link
Facebook
X
Pinterest
Email
Other Apps

This is my git aliases

aliase git

Get link
Facebook
X
Pinterest
Email
Other Apps

Comments

Ruby Tricks

1. Object#tap If you have a method which updates one key in hash, you need to add return that hash in the end of method. But you can use Object#tap ! The result will be equal 2. bsearch If you need to use "find" in a big sorted Array, change method to bsearch user system total real find 3.020000 0.010000 3.030000 ( 3.028417 ) bsearch 0.000000 0.000000 0.000000 ( 0.000006 ) 3. Flat_map If you have two or more "map" methods, and as a result you get multidimensional array like [[1,2], [[3],4]]]. [[['Ben', 'Sam', 'David'], ['Keith']], [[], [nil]], [['Chris'], []]] What can you do? You can use method flatten after each "map" But it will be s horter ...

Custom validation in Rails

If you have your own validates class Invite validates :invitee_email , format: { with: /\A([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})\z/i , message: "is not an email" } end class Invite validates :invitee_email , format: { with: Devise . email_regexp , allow_blank: false } end You can refactor it # app/validators/email_validator.rb class EmailValidator < ActiveModel :: EachValidator def validate_each ( record , attribute , value ) unless value =~ /\A([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})\z/i record . errors [ attribute ] << ( options [ :message ] || "is not an email" ) end end end class Invite # Rails "magic" infers the name of the validation validates :invitee_email , email: true end class EmailValidator < ActiveModel :: EachValidator def validate_each ( record , attribute , value ) unless value =~ Devise . email_regexp...

Async in Ruby

require " async " require " open-uri " require " httparty " require " redis " require " net/ssh " require " sequel " DB = Sequel .postgres Sequel .extension( : fiber_concurrency ) start = Time .now Async do |task| task.async do URI .open( " https://httpbin.org/delay/1.6 " ) end task.async do HTTParty .get( " https://httpbin.org/delay/1.6 " ) end task.async do Redis .new.blpop( " abc123 " , 2 ) end task.async do Net :: SSH .start( " 164.90.237.21 " ).exec!( " sleep 1 " ) end task.async do DB .run( " SELECT pg_sleep(2) " ) end task.async do sleep 2 end task.async do ` sleep 2 ` end end puts " Duration: #{ Time .now - start } " (C)

Powered by Blogger

Ihor Micky Pavliv

Git Aliases

Comments

Post a Comment