Code snips by codesnips

javascript

import { Controller } from "@hotwired/stimulus"

export default class extends Controller {
  static targets = ["wrapper", "template", "anchor"]

  add(event) {

Stimulus: nested fields add/remove without re-rendering

rails stimulus hotwire

by codesnips 4 tabs

javascript

import { Controller } from "@hotwired/stimulus"

export default class extends Controller {
  static targets = ["input"]
  static values = { wait: { type: Number, default: 300 }, url: String }

Stimulus: debounced search that plays nicely with Turbo

rails stimulus hotwire

by codesnips 3 tabs

ruby

class AdminController < ApplicationController
  before_action :authenticate_admin!
  before_action :disable_turbo_cache, only: %i[dashboard moderation_queue]

  helper_method :turbo_cache_control_tag

Turbo Drive: disable caching on volatile admin pages

rails turbo hotwire

by codesnips 3 tabs

erb

<!DOCTYPE html>
<html>
  <head>
    <title>Contacts</title>
    <%= csrf_meta_tags %>
    <%= csp_meta_tag %>

Turbo Frames modal: load, submit, then close via stream

rails turbo hotwire

by codesnips 4 tabs

ruby

class CommentsController < ApplicationController
  before_action :set_post

  def new
    @comment = @post.comments.build
  end

Turbo Stream form errors: replace only the form frame

rails turbo hotwire

by codesnips 4 tabs

ruby

class Comment < ApplicationRecord
  belongs_to :post
  belongs_to :author, class_name: "User"

  validates :body, presence: true

Model broadcasts: prepend on create, replace on update

rails hotwire turbo-streams

by codesnips 4 tabs

erb

<%= turbo_frame_tag dom_id(contact) do %>
  <tr class="contact-row">
    <td><%= contact.name %></td>
    <td><%= contact.email %></td>
    <td><%= contact.role.titleize %></td>
    <td class="actions">

Turbo Frames: Inline edit that swaps form <-> row

rails turbo hotwire

by codesnips 3 tabs

ruby

class CommentsController < ApplicationController
  before_action :set_post

  def create
    @comment = @post.comments.build(comment_params)

Turbo Streams: Create with prepend + HTML fallback

rails turbo hotwire

by codesnips 4 tabs

ruby

class ApplicationCommand
  Result = Struct.new(:value, :errors) do
    def success?
      errors.nil? || errors.empty?
    end

Keep Controllers Thin: Use Command Objects

rails architecture command-object

by codesnips 3 tabs

ruby

class ReindexCheckpoint < ApplicationRecord
  enum status: { idle: 0, running: 1, done: 2, failed: 3 }

  validates :index_name, presence: true, uniqueness: true

  def self.for(index_name)

Safer Background Reindex: slice batches + checkpoints

rails reliability elasticsearch

by codesnips 4 tabs

ruby

class Category < ApplicationRecord
  has_many :products, dependent: :restrict_with_error
  has_many :subcategories,
           class_name: "Category",
           foreign_key: :parent_id,
           dependent: :restrict_with_error

Safer Deletion with dependent: :restrict_with_error

rails activerecord data-integrity

by codesnips 4 tabs

ruby

class CreateEmailDeliveries < ActiveRecord::Migration[7.1]
  def change
    create_table :email_deliveries do |t|
      t.string :dedupe_key, null: false
      t.string :mailer, null: false
      t.string :action, null: false

Transactional Email “Send Once” with Delivered Marker

rails reliability activerecord

by codesnips 4 tabs