Methods
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Attributes
[R] query_cache
[R] query_cache_enabled
Instance Public methods
cache()

Enable the query cache within the block.

# File activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb, line 24
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.

# File activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb, line 54
def clear_query_cache
  @query_cache.clear
end
dirties_query_cache(base, *method_names)
# File activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb, line 9
        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
disable_query_cache!()
# File activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb, line 36
def disable_query_cache!
  @query_cache_enabled = false
end
enable_query_cache!()
# File activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb, line 32
def enable_query_cache!
  @query_cache_enabled = true
end
included(base)
# File activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb, line 5
def included(base)
  dirties_query_cache base, :insert, :update, :delete
end
select_all(arel, name = nil, binds = [])
# File activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb, line 58
def select_all(arel, name = nil, binds = [])
  if @query_cache_enabled && !locked?(arel)
    sql = to_sql(arel, binds)
    cache_sql(sql, binds) { super(sql, name, binds) }
  else
    super
  end
end
uncached()

Disable the query cache within the block.

# File activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb, line 41
def uncached
  old, @query_cache_enabled = @query_cache_enabled, false
  yield
ensure
  @query_cache_enabled = old
end