CodeSnips

ruby

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

  validates :body, presence: true, length: { maximum: 10_000 }

Granular Cache Invalidation with touch: true

rails caching activerecord

by codesnips 4 tabs

ruby

module CollectionCacheKey
  extend ActiveSupport::Concern

  def cache_key_for(scope)
    relation = scope.respond_to?(:all) ? scope.all : scope
    model = relation.klass

Deterministic Cache Keys for Collections

rails caching activerecord

by codesnips 3 tabs

sql

-- Product.active.touch_all(:cache_synced_at) for catalog 42
UPDATE "products"
SET "updated_at" = '2024-05-01 12:00:00.123456',
    "cache_synced_at" = '2024-05-01 12:00:00.123456'
WHERE "products"."catalog_id" = 42
  AND "products"."status" = 'active';

Use `touch_all` for Efficient “Bump Updated At”

rails activerecord performance

by codesnips 4 tabs

ruby

class CacheNamespace
  attr_reader :name

  def initialize(name, store: Rails.cache)
    @name = name.to_s
    @store = store

Cache Key Versioning with a Single “namespace”

rails caching cache-invalidation

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typescript

import { createHash } from "crypto";
import { Request, Response } from "express";

export function computeEtag(body: string): string {
  const digest = createHash("sha1").update(body).digest("base64");
  return `"${digest}"`;

ETag + conditional GET for read-heavy endpoints

performance express http-caching

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ruby

class DashboardMetrics
  include ActiveModel::Model

  attr_reader :account

  def initialize(account)

Expiring Dashboard Fragment Caches with a Versioned Composite Cache Key in Rails

rails caching fragment-caching

by codesnips 3 tabs