rails8: solid cache 使用指南

rails8 提供的另一种缓存方案

What is Solid Cache?

这三个适配器的设计理念很简单：现代固态硬盘和 NVMe 硬盘的速度足以处理许多以前需要内存解决方案才能完成的任务。

通过利用这些高速驱动器，Rails 不再需要单独的基于 RAM 的工具，如 Redis。

本文涉及代码在这里可以找到： github 地址

Local	Remote
Memory	MemoryStore
Disk	FileStore

安装

注意，官方文档这些步骤没有写清楚，以我这里列出的为准 (时间是: 2024年11月27)

# rails8里默认已经添加
bundle add solid_cache
# tw
bin/rails css:install:tailwind
# 安装(网上很多教程里的 install:migrations 是老版本的做法)
./bin/rails solid_cache:install

# 这一步有可能不需要
mkdir -p db/cache_migrate
# 创建 migration
$ rails generate migration CreateSolidCacheTable --database=cache
# 将上面步骤里 `solid_cache:install` 的东西 copy 进去，然后 migrate
$ rails db:migrate

开发/生产环境配置 database.yml

• 注意在 dev 环境需要开启 rails dev:cache 功能，否则没有反应
• 定义2个数据库，好处是如果备份，不用备份缓存数据库了

# SQLite. Versions 3.8.0 and up are supported.
#   gem install sqlite3
#
#   Ensure the SQLite 3 gem is defined in your Gemfile
#   gem "sqlite3"
#
default: &default
  adapter: sqlite3
  pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
  timeout: 5000

development:
  primary:
    <<: *default
    database: storage/development.sqlite3
    # database: path/to/persistent/storage/development.sqlite3
  cache:
    <<: *default
    # database: path/to/persistent/storage/development_cache.sqlite3
    migrations_paths: db/cache_migrate
    database: storage/development_cache.sqlite3


# SQLite3 write its data on the local filesystem, as such it requires
# persistent disks. If you are deploying to a managed service, you should
# make sure it provides disk persistence, as many don't.
#
# Similarly, if you deploy your application as a Docker container, you must
# ensure the database is located in a persisted volume.
production:
  primary:
    <<: *default
    # database: path/to/persistent/storage/production.sqlite3
  cache:
    <<: *default
    # database: path/to/persistent/storage/production_cache.sqlite3
    migrations_paths: db/cache_migrate

自身缓存配置 config/cache.yml

此段为默认配置，没有修改

default: &default
  store_options:
    # Cap age of oldest cache entry to fulfill retention policies
    # max_age: <%= 60.days.to_i %>
    max_size: <%= 256.megabytes %>
    namespace: <%= Rails.env %>

development:
  <<: *default

test:
  <<: *default

production:
  database: cache
  <<: *default

测试有没有成功