Milind 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

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

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

	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

	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?

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

	Output: