# Caching Strategies

> >-

- **Type:** Skill
- **Install:** `agentstack add skill-thibautbaissac-rails-ai-agents-caching-strategies`
- **Verified:** Yes — security-reviewed for prompt injection and unsafe behavior
- **Seller:** [ThibautBaissac](https://agentstack.voostack.com/s/thibautbaissac)
- **Installs:** 0
- **Category:** [Agent Skills](https://agentstack.voostack.com/c/agent-skills)
- **Latest version:** 0.1.0
- **License:** MIT
- **Upstream author:** [ThibautBaissac](https://github.com/ThibautBaissac)
- **Source:** https://github.com/ThibautBaissac/rails_ai_agents/tree/main/.claude/skills/caching-strategies
- **Website:** https://thibautbaissac.github.io/

## Install

```sh
agentstack add skill-thibautbaissac-rails-ai-agents-caching-strategies
```

Requires the [AgentStack CLI](https://agentstack.voostack.com/docs/cli). Works with Claude Code, Cursor, and any MCP-compatible agent.

## About

# Caching Strategies for Rails 8

## Overview

Rails provides multiple caching layers:
- **Fragment caching**: Cache view partials
- **Russian doll caching**: Nested cache fragments
- **Low-level caching**: Cache arbitrary data
- **HTTP caching**: Browser and CDN caching
- **Query caching**: Automatic within requests

## Quick Start

```ruby
# config/environments/development.rb
config.action_controller.perform_caching = true
config.cache_store = :memory_store

# config/environments/production.rb
config.cache_store = :solid_cache_store  # Rails 8 default
# OR
config.cache_store = :redis_cache_store, { url: ENV["REDIS_URL"] }
```

Enable caching in development:
```bash
bin/rails dev:cache
```

## Cache Store Options

| Store | Use Case | Pros | Cons |
|-------|----------|------|------|
| `:memory_store` | Development | Fast, no setup | Not shared, limited size |
| `:solid_cache_store` | Production (Rails 8) | Database-backed, no Redis | Slightly slower |
| `:redis_cache_store` | Production | Fast, shared | Requires Redis |
| `:file_store` | Simple production | Persistent, no Redis | Slow, not shared |
| `:null_store` | Testing | No caching | N/A |

## Fragment Caching

### Basic Fragment Cache

```erb

  
    
    
    
    
  

```

### Cache Key Components

Rails generates cache keys from:
- Model name
- Model ID
- `updated_at` timestamp
- Template digest (automatic)

```ruby
# Generated key example:
# views/events/123-20240115120000000000/abc123digest
```

### Custom Cache Keys

```erb

  ...

  ...

  

```

## Russian Doll Caching

Nested caches where inner caches are reused when outer cache is invalidated:

```erb

  

  
    
      
        
      
    
  

  
    
      
        
      
    
  

```

Use `touch: true` on `belongs_to` associations to cascade invalidation up the chain. See [cache-invalidation.md](references/cache-invalidation.md) for examples.

## Collection Caching

### Efficient Collection Rendering

```erb

(event) { [event, current_user.admin?] } %>
```

## Low-Level Caching

Use `Rails.cache.fetch` with a block for the most common pattern. See [low-level-caching.md](references/low-level-caching.md) for:
- Basic read/write/fetch examples
- Caching in service objects
- Caching in query objects
- Instance variable memoization
- Request-scoped memoization with `CurrentAttributes`

## Cache Invalidation

Three strategies: time-based expiration, key-based expiration (using `updated_at`), and manual deletion. See [cache-invalidation.md](references/cache-invalidation.md) for:
- Time-based and key-based expiration
- Manual invalidation in model callbacks and services
- Pattern-based deletion (`delete_matched`)
- `touch: true` for Russian doll cascade
- Built-in and custom counter caches

## HTTP Caching

Use `stale?` for conditional GET (ETags/Last-Modified) and `expires_in` for Cache-Control headers. See [http-caching-and-testing.md](references/http-caching-and-testing.md) for full examples.

## Testing Caching

Use a `:caching` metadata tag to enable caching in specs. See [http-caching-and-testing.md](references/http-caching-and-testing.md) for:
- `rails_helper.rb` configuration
- Testing cached view invalidation
- Testing cache invalidation in services
- Performance monitoring and instrumentation

## Checklist

- [ ] Cache store configured for environment
- [ ] Fragment caching on expensive partials
- [ ] `touch: true` on belongs_to for Russian doll
- [ ] Collection caching with `cached: true`
- [ ] Low-level caching for expensive queries
- [ ] Cache invalidation strategy defined
- [ ] Counter caches for counts
- [ ] HTTP caching headers for API
- [ ] Cache warming for cold starts (if needed)
- [ ] Monitoring for hit/miss rates

## References

- [low-level-caching.md](references/low-level-caching.md) - fetch/read/write, service objects, query objects, memoization
- [cache-invalidation.md](references/cache-invalidation.md) - expiration strategies, manual invalidation, touch, counter caches
- [http-caching-and-testing.md](references/http-caching-and-testing.md) - ETags, Cache-Control, spec configuration, monitoring

## Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

- **Author:** [ThibautBaissac](https://github.com/ThibautBaissac)
- **Source:** [ThibautBaissac/rails_ai_agents](https://github.com/ThibautBaissac/rails_ai_agents)
- **License:** MIT
- **Homepage:** https://thibautbaissac.github.io/

Install and usage instructions live in the source repository linked above.

## Pricing

- **Free** — Free

## Security capabilities

Automated source analysis of v0.1.0 — what this tool can access:

- **Network access:** no
- **Filesystem access:** no
- **Shell / process execution:** no
- **Environment & secrets:** no
- **Dynamic code execution:** no

*"Yes" means the capability is present in the source — more access means more to trust, not that it is unsafe.*


## Versions

- **0.1.0** — security scan: passed — Imported from the upstream source.

## Links

- Listing page: https://agentstack.voostack.com/l/skill-thibautbaissac-rails-ai-agents-caching-strategies
- Seller: https://agentstack.voostack.com/s/thibautbaissac
- Browse the marketplace: https://agentstack.voostack.com/browse

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