select_options_caching

🔄 Performance Optimization: Caching Heavy Select Collections

Avoid repeated DB hits for large select inputs by caching collections with low TTL and invalidation hooks. Wrap the collection fetch in Rails.cache.fetch and expire on relevant model callbacks.

# app/helpers/form_collections.rb
module FormCollections
  def cached_user_options
    Rails.cache.fetch('user_options', expires_in: 1.hour) do
      User.active.order(:name).pluck(:name, :id)
    end
  end
end

# In a model or observer
after_commit :expire_user_options_cache, on: [:create, :update, :destroy]

def expire_user_options_cache
  Rails.cache.delete('user_options')
end

<%= f.select :assignee_id, cached_user_options, prompt: 'Select user' %>