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Ruby on Rails Cheatsheet

Architecture

Create a new application

Install the Rails gem if you haven't done so before

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%Q, %q, %W, %w, %x, %r, %s, %i

Perl-inspired notation to quote strings: by using % (percent character) and specifying a delimiting character.

Any single non-alpha-numeric character can be used as the delimiter, %[including these], %?or these?, %~or even these things~.

Strings

% or %Q

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VSCode italic font settings

Add this to settings.json (cmd ,):

{
  "editor.fontFamily": "Operator Mono, Fira Code iScript, Menlo, Monaco, 'Courier New', monospace",
  "editor.fontLigatures": true,
  "editor.tokenColorCustomizations": {
    "textMateRules": [
      {

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<script>
import { ref } from '@vue/composition-api'
import { onScrollBottom } from '@/scroll'

export default {
  setup () {
    function loadMore () {
      // ...
    }
    

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# GenServer callbacks and return values

## init(args)

    {:ok, state}
    {:ok, state, timeout}
    :ignore
    {:stop, reason}
    
## handle_call(msg, {from, ref}, state)

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Phoenix 1.4 ships with exciting new features, most notably with HTTP2 support, improved development experience with faster compile times, new error pages, and local SSL certificate generation. Additionally, our channel layer internals receiveced an overhaul, provided better structure and extensibility. We also shipped a new and improved Presence javascript API, as well as Elixir formatter integration for our routing and test DSLs.

This release requires few user-facing changes and should be a fast upgrade for those on Phoenix 1.3.x.

Install the new phx.new project generator

The mix phx.new archive can now be installed via hex, for a simpler, versioned installation experience.

To grab the new archive, simply run:

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defmodule DeeplyNested do

  def get_nat_ip(input) do
    steps = [first_map_with_key("accessConfigs"),
             first_map_with_key("natIP")
    ]
    get_in(input, steps)
  end

  defp first_map_with_key(key) do

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Shallow

Real unit test (isolation, no children render)

Simple shallow

Calls:

• constructor
• render

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Migrations & Seeding

What are migrations??

Migrations are a way to make database changes or updates, like creating or dropping tables, as well as updating a table with new columns with constraints via generated scripts. We can build these scripts via the command line using knex command line tool.

To learn more about migrations, check out this article on the different types of database migrations!

Creating/Dropping Tables

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相同的colorschema，vim和gvim的颜色差距还是很大的，因为gvim使用X的颜色，而vim只能使用终端提供的颜色，所以造成了二者的显示差异。

xterm开启256色

现在的终端模拟器早就支持256色了，不过默认可能还是8色的。
开启xterm终端，查看xterm终端支持的颜色

命令：
$ tput colors
8