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ActiveRecord::ConnectionAdapters::QueryCache

Attributes

query_cache[R]
query_cache_enabled[R]

Public Class Methods

dirties_query_cache(base, *method_names) click to toggle source
# File lib/active_record/connection_adapters/abstract/query_cache.rb, line 14
def dirties_query_cache(base, *method_names)
  method_names.each do |method_name|
    base.class_eval               def #{method_name}_with_query_dirty(*args)        # def update_with_query_dirty(*args)                clear_query_cache if @query_cache_enabled       #   clear_query_cache if @query_cache_enabled                #{method_name}_without_query_dirty(*args)       #   update_without_query_dirty(*args)              end                                               # end                                                                #              alias_method_chain :#{method_name}, :query_dirty  # alias_method_chain :update, :query_dirty, __FILE__, __LINE__ + 1
  end
end
included(base) click to toggle source
# File lib/active_record/connection_adapters/abstract/query_cache.rb, line 5
def included(base)
  base.class_eval do
    alias_method_chain :columns, :query_cache
    alias_method_chain :select_all, :query_cache
  end

  dirties_query_cache base, :insert, :update, :delete
end

Public Instance Methods

cache() click to toggle source

Enable the query cache within the block.

# File lib/active_record/connection_adapters/abstract/query_cache.rb, line 31
def cache
  old, @query_cache_enabled = @query_cache_enabled, true
  @query_cache ||= {}
  yield
ensure
  clear_query_cache
  @query_cache_enabled = old
end
clear_query_cache() click to toggle source

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 lib/active_record/connection_adapters/abstract/query_cache.rb, line 54
def clear_query_cache
  @query_cache.clear if @query_cache
end
columns_with_query_cache(*args) click to toggle source
# File lib/active_record/connection_adapters/abstract/query_cache.rb, line 66
def columns_with_query_cache(*args)
  if @query_cache_enabled
    @query_cache["SHOW FIELDS FROM #{args.first}"] ||= columns_without_query_cache(*args)
  else
    columns_without_query_cache(*args)
  end
end
select_all_with_query_cache(*args) click to toggle source
# File lib/active_record/connection_adapters/abstract/query_cache.rb, line 58
def select_all_with_query_cache(*args)
  if @query_cache_enabled
    cache_sql(args.first) { select_all_without_query_cache(*args) }
  else
    select_all_without_query_cache(*args)
  end
end
uncached() click to toggle source

Disable the query cache within the block.

# File 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

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