codesnips

rails

ruby 
class TenantResolver
  RESERVED = %w[www app admin].freeze

  def initialize(app)
    @app = app
  end

Multi-Tenant Subdomain Isolation with Rack Middleware and Thread-Local Scoping

rails rack multi-tenancy
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 
module RequestStore
  def self.store
    Thread.current[:request_store] ||= {}
  end

  def self.fetch(key)

Hot Path Memoization (within request only)

rails performance memoization
by codesnips 4 tabs
erb 
<%= link_to 'Newest', posts_path(sort: 'new'), data: { turbo_frame: 'results', turbo_action: 'replace' } %>
<%= link_to 'Popular', posts_path(sort: 'popular'), data: { turbo_frame: 'results', turbo_action: 'replace' } %>

Hotwire-friendly “sort by” links that replace only the list

rails hotwire turbo
by Henry Kim 2 tabs
ruby 
class CounterBuffer
  DELTA_HASH = "counter:deltas".freeze

  READ_RESET = <<~LUA.freeze
    local v = redis.call('HGET', KEYS[1], ARGV[1])
    if v then redis.call('HDEL', KEYS[1], ARGV[1]) end

Debounce Expensive Counter Cache Updates with a Throttled Redis Buffer in Rails

rails redis counter-cache
by codesnips 3 tabs
ruby 
class ImportRun < ApplicationRecord
  enum status: { pending: 0, running: 1, completed: 2, failed: 3 }

  def percent
    return 0 if total.to_i.zero?
    [(processed.to_f / total * 100).round, 100].min

Live Turbo Streams Progress Bar for a Long Rails Job

rails turbo-streams hotwire
by codesnips 4 tabs
ruby 
class InvoicesController < ApplicationController
  def index
    invoices = InvoicesQuery.new(current_account.invoices, filter_params).call

    @invoices = invoices.page(params[:page]).per(25)
    render :index

Building a Composable Query Object for Filtering Rails ActiveRecord Scopes

rails activerecord query-object
by codesnips 3 tabs
ruby 
class LikesController < ApplicationController
  before_action :set_post

  def create
    @like = current_user.likes.create!(post: @post)
    respond(liked: true)

Turbo Streams: swap a button state and counter in one response

rails hotwire turbo
by codesnips 4 tabs
ruby 
class AddSlugToPosts < ActiveRecord::Migration[7.1]
  def change
    add_column :posts, :slug, :string, null: false
    add_index :posts, :slug, unique: true
  end
end

Database-Backed Unique Slugs with Retry

rails postgres slugs
by codesnips 4 tabs
ruby 
module Posts
  class CreateService
    def initialize(author:, params:)
      @author = author
      @params = params
    end

Rails service objects for business logic

rails architecture service-objects
by Maya Patel 2 tabs
ruby 
namespace :cleanup do
  desc "Enqueue a job to purge expired sessions"
  task expired_sessions: :environment do
    job = ExpiredSessionCleanupJob.perform_later
    Rails.logger.info("[cleanup:expired_sessions] enqueued job #{job.job_id}")
  end

Recurring Cleanup with a Rake Task and an Idempotent Active Job in Rails

rails background-jobs active-job
by codesnips 4 tabs
ruby 
Rails.application.routes.draw do
  namespace :api, defaults: { format: :json } do
    namespace :v1 do
      resources :articles, only: [:index, :show, :create, :update, :destroy]
      resources :sessions, only: [:create]
    end

Versioned JSON API Namespace in Rails With a Shared Base Controller

rails api versioning
by codesnips 3 tabs