Methods
Attributes
[R] query_cache
[R] query_cache_enabled
Public Class methods
dirties_query_cache(base, *method_names)

[ show source ]

  # File activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb, line 11
def dirties_query_cache(base, *method_names)
  method_names.each do |method_name|
    base.class_eval               def #{method_name}(*)                         # def update_with_query_dirty(*args)                clear_query_cache if @query_cache_enabled   #   clear_query_cache if @query_cache_enabled                super                                       #   update_without_query_dirty(*args)              end                                           # end, __FILE__, __LINE__ + 1
  end
end
included(base)

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  # File activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb, line 7
def included(base)
  dirties_query_cache base, :insert, :update, :delete
end
Public Instance methods
cache()

Enable the query cache within the block.

[ show source ]

  # File activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb, line 26
def cache
  old, @query_cache_enabled = @query_cache_enabled, true
  yield
ensure
  clear_query_cache
  @query_cache_enabled = old
end
clear_query_cache()

Clears the query cache.

One reason you may wish to call this method explicitly is between queries that ask the database to randomize results. Otherwise the cache would see the same SQL query and repeatedly return the same result each time, silently undermining the randomness you were expecting.

[ show source ]

  # File activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb, line 48
def clear_query_cache
  @query_cache.clear
end
select_all(*args)

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  # File activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb, line 52
def select_all(*args)
  if @query_cache_enabled
    cache_sql(args.first) { super }
  else
    super
  end
end
uncached()

Disable the query cache within the block.

[ show source ]

  # File activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb, line 35
def uncached
  old, @query_cache_enabled = @query_cache_enabled, false
  yield
ensure
  @query_cache_enabled = old
end