method

cache_key

v4.2.9 - Show latest stable - Class: ActiveRecord::Integration

cache_key(*timestamp_names)

public

Returns a cache key that can be used to identify this record.

Product.new.cache_key     # => "products/new"
Product.find(5).cache_key # => "products/5" (updated_at not available)
Person.find(5).cache_key  # => "people/5-20071224150000" (updated_at available)

You can also pass a list of named timestamps, and the newest in the list will be used to generate the key:

Person.find(5).cache_key(:updated_at, :last_reviewed_at)

# File activerecord/lib/active_record/integration.rb, line 55
    def cache_key(*timestamp_names)
      case
      when new_record?
        "#{model_name.cache_key}/new"
      when timestamp_names.any?
        timestamp = max_updated_column_timestamp(timestamp_names)
        timestamp = timestamp.utc.to_s(cache_timestamp_format)
        "#{model_name.cache_key}/#{id}-#{timestamp}"
      when timestamp = max_updated_column_timestamp
        timestamp = timestamp.utc.to_s(cache_timestamp_format)
        "#{model_name.cache_key}/#{id}-#{timestamp}"
      else
        "#{model_name.cache_key}/#{id}"
      end
    end

cache_key

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