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Description: simple identity map for active record. eager loading associations FTL
Clone URL: git://github.com/technoweenie/active_record_context.git
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add active_record_context plugin
technoweenie (author)
Sat Nov 25 22:50:21 -0800 2006
commit  2c267883690e1dfa3df5a5545537b5c86ebf1ac8
tree    30e0eda8c178b0ea0b331c63886d11bd3769520f
active_record_context / lib / technoweenie / active_record_context.rb
100644 42 lines (36 sloc) 1.074 kb
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module Technoweenie
  module ActiveRecordContext
    def self.extended(base)
      class << base
        alias_method_chain :find_every, :context
        alias_method_chain :find_one,   :context
      end
    end
    
    mattr_reader :context_cache
 
    def find_every_with_context(options)
      returning find_every_without_context(options) do |records|
        store_in_context records
      end
    end
    
    def find_one_with_context(id, options)
      cached = options[:conditions].nil? && find_in_context(id)
      cached ? cached : find_one_without_context(id, options)
    end
 
    def find_in_context(id)
      context_cache && context_cache[self] && context_cache[self][id.to_i]
    end
    
    def store_in_context(records)
      return if context_cache.nil?
      records.inject(context_cache[self] ||= {}) do |memo, record| 
        memo.update record.id => record
      end
    end
    
    # Enables the context cache inside this block.
    def with_context
      @@context_cache = {}
      yield
    ensure
      @@context_cache = nil
    end
  end
end