mike1011

Resources:

https://github.com/ankane/searchkick

Indexing

By default, simply adding the call 'searchkick' to a model will do an unclever indexing of all fields (but not has_many or belongs_to attributes).

In practice, you'll need to customize what gets indexed. This is done by defining a method on your model called search_data

def search_data

mike1011

Run rails new --help to view all of the options you can pass to rails new:

$ bin/rails new --help
Usage:
  rails new APP_PATH [options]

Options:
  -r, [--ruby=PATH]                                      # Path to the Ruby binary of your choice
                                                         # Default: /Users/eliot/.rbenv/versions/2.2.0/bin/ruby

mike1011

Arel Cheatsheet on Steroids

A (more) complete cheatsheet for Arel, including NamedFunction functions, raw SQL and window functions.

Tables

posts = Arel::Table.new(:posts)
posts = Post.arel_table # ActiveRecord

Table alias

mike1011

var a={},
b={key:'b'},
c={key:'c'};
a[b]=123;
a[c]=456;
console.log(a[b]);
console.log(a);

Output:

mike1011

module Authenticable

  # Devise methods overwrite
  def current_user
    @current_user ||= User.find_by(authentication_token: request.headers['Authorization'])
  end

  def authenticate_with_token!
    render json: { errors: "Not authenticated" },
                status: :unauthorized unless user_signed_in?

mike1011

convert string in arrays
add all elements of array
find duplicate element in array
get fibonacci series of any given number
get factorial of any given number
create a pyramid of star
find remainder of a number
create recursive function -  get value and add new value to the output
create a logic to check if number is a palindrome or not
check max occurance of any chars in a string

mike1011

DigitalOcean Rails/Ubuntu/NGINX (16.04) Setup

1. Setup
2. Swapfile
3. NGINX
4. ElasticSearch
5. RVM
6. Rails
7. Redis
8. Postgres

mike1011

What is Circular Dependency?
Shallow vs Deep Copy.
Array.sort() - with numbers and strings.
PUT vs PATCH
What is package-lock.json?
---ref - https://medium.com/iquii/good-practices-for-high-performance-and-scalable-node-js-applications-part-1-3-bb06b6204197
What is this? How arrow functions using it to help the binding?
Session Management in Nodejs
API Authentication in Nodejs
Default memory size in NOdejs

mike1011

========== ONLY RUBY ==========
array vs hash - ordered indexed collection
convert hash to array = h.to_a
get even/odd entries from array -> select.each_with_index { |_, i| i.even? }
get hash keys in reverse order -> Hash[h.to_a.reverse] OR hash_array.keys.reverse
---replace strings --
 value = "cat"
 # Replace string at with ote.
 value.sub!("at", "ote") // just first instance - cote
 value = value.gsub("cat", "---") //all instances globally ---

mike1011

   To begin with, firstly create a new repository on github WITHOUT INITIALIZING it.
   
   ## clean up existing repo
   rm -rf .git
   ## re-initialize it with new .git settings
   git init
   ## firstly, dont commit any code, just create/add new sample/readme file and push it to new repo/master
   git add README.md 
   ## add newly created fresh repo
   git remote add origin git@github.com:username/my-new-master-repo.git