Rails8でSolid Cacheを使ってみる

デフォで入っているのでinstallしても何も変わらず

$ bin/rails solid_cache:install
   identical  config/cache.yml
   identical  db/cache_schema.rb
   gsub  config/environments/production.rb

あっきー

設定ファイルでもproductionのみSolid Cacheを使うようになっていた

config/cache.yml

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

config/database.yml

# 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:
  <<: *default
  database: storage/development.sqlite3

# Warning: The database defined as "test" will be erased and
# re-generated from your development database when you run "rake".
# Do not set this db to the same as development or production.
test:
  <<: *default
  database: storage/test.sqlite3


# Store production database in the storage/ directory, which by default
# is mounted as a persistent Docker volume in config/deploy.yml.
production:
  primary:
    <<: *default
    database: storage/production.sqlite3
  cache:
    <<: *default
    database: storage/production_cache.sqlite3
    migrations_paths: db/cache_migrate
  queue:
    <<: *default
    database: storage/production_queue.sqlite3
    migrations_paths: db/queue_migrate
  cable:
    <<: *default
    database: storage/production_cable.sqlite3
    migrations_paths: db/cable_migrate

あっきー

development環境にsolid cacheを設定する

あっきー

設定ファイルの変更

config/cache.yml

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:
+ database: cache
  <<: *default

test:
  <<: *default

production:
  database: cache
  <<: *default

config/database.yml

# 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:
-  <<: *default
-  database: storage/development.sqlite3
+  primary:
+    <<: *default
+    database: storage/development.sqlite3
+  cache:
+    <<: *default
+    database: storage/development_cache.sqlite3
+    migrations_paths: db/cache_migrate

あっきー

Then run db:prepare in production to ensure the database is created and the schema is loaded.

公式の説明に従って rails db:prepare 実行

bin/rails db:prepare

ファイル（DB）ができた

prepareはこれ

あっきー

rails console から使ってみる

あっきー

テーブルが無いと怒られた。

$ rails c
Loading development environment (Rails 8.0.0)
test-app(dev)> Rails.cache.read("test")
(test-app):1:in `<main>': Could not find table 'solid_cache_entries' (ActiveRecord::StatementInvalid)

あっきー

rails db で中身を確認すると存在するので接続先がcacheのDBになっていなさそう

$ rails db --db=cache
SQLite version 3.47.0 2024-10-21 16:30:22
Enter ".help" for usage hints.
sqlite> .table
ar_internal_metadata  schema_migrations     solid_cache_entries

あっきー

どこかで config/cache.yml の設定が巻き戻っていたぽいので戻したら正常に動作を確認

$ rails c
Loading development environment (Rails 8.0.0)
test-app(dev)> Rails.cache.read("test")
  SolidCache::Entry Load (0.4ms)  SELECT "solid_cache_entries"."key", "solid_cache_entries"."value" FROM "solid_cache_entries" WHERE "solid_cache_entries"."key_hash" IN (-8888549517541498432) /*application='TestApp'*/
=> nil

このスクラップは16日前にクローズされました