ray-sh

Common Options

-#, --progress-bar Make curl display a simple progress bar instead of the more informational standard meter.

-b, --cookie <name=data> Supply cookie with request. If no =, then specifies the cookie file to use (see -c).

-c, --cookie-jar <file name> File to save response cookies to.

ray-sh

#start psql
psql postgres 

# list all databases
\l

#connect the db
\c db_name

#list all tables

ray-sh

Phoenix Nodes

First I created 3 droplets on digital ocean with 4-cores and 8GB of RAM. Login as root to each and run:

sysctl -w fs.file-max=12000500
sysctl -w fs.nr_open=20000500
ulimit -n 4000000
sysctl -w net.ipv4.tcp_mem='10000000 10000000 10000000'

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#A plug to get cookies from conn
defmodule AuthorizedPlug do
    import Plug.Conn
    import Phoenix.Controller

    def init(options) do
        options
    end

    def call(conn, name) do

ray-sh

https://ryanstutorials.net/bash-scripting-tutorial/bash-if-statements.php

ray-sh

1. Begin with scaffolding a create-react-app, then update your package.json build script (replace DIR_TO_PHX_APP with the path to your phoenix app)

"build": "react-scripts build && rm -rf DIR_TO_PHX_APP/priv/static/build && mv build DIR_TO_PHX_APP/priv/static/build",

This will move your prod build files to DIR_TO_PHX_APP/priv/static/build on build

2. Run yarn build

ray-sh

Prepare Postgres for phoenix

Pre-Reqs

Brew Package Manager

In your command-line run the following commands:

1. brew doctor
2. brew update

ray-sh

问题：
"(){}[]"   =>  True
"([{}])"   =>  True
"(}"       =>  False
"[(])"     =>  False
"[({})](]" =>  False
基本思想：在算法中设置一个栈，每读入一个括号，若是右括号，则或者与栈顶匹配的左括号相互消解，或者是不合法的情况；若是左括号，则直接压入栈中。
若括号匹配，在算法的开始和结束时，栈都应该是空的。

defmodule Challenge do

ray-sh

#Build relation is very common in DB layer, like user and it's posts

#1> We need define the relation between Module user and posts
schema "users" do
  has_many :posts, Blog.Post
end

schema "posts" do
  belongs_to(:user, Blog.User)
end

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#Function used in auth
#1>Save the user id in session and current_user in  conn.assign which will exposed as @current_user for all template

#Deliver pass port to user, user will carry the :user_id in next request
def deliver_passport_to_user(conn,user) do
    conn
    |>assign(:current_user, user)
    |>put_session(:user_id,user.id)
    |>configure_session(renew: true) #Renew the session to keep our safe
end