Module: ActiveRecord::ConnectionAdapters::QueryCache
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Defined in: | activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb |
Class Method Summary
Instance Attribute Summary
- #query_cache readonly
- #query_cache_enabled readonly
Instance Method Summary
-
#cache
Enable the query cache within the block.
-
#clear_query_cache
Clears the query cache.
- #disable_query_cache!
- #enable_query_cache!
- #initialize
-
#uncached
Disable the query cache within the block.
Class Method Details
.dirties_query_cache(base, *method_names)
[ GitHub ]# File 'activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb', line 20
def dirties_query_cache(base, *method_names) method_names.each do |method_name| base.class_eval <<-end_code, __FILE__, __LINE__ + 1 def #{method_name}(...) ActiveRecord::Base.clear_query_caches_for_current_thread super end end_code end end
Instance Attribute Details
#query_cache (readonly)
[ GitHub ]# File 'activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb', line 53
attr_reader :query_cache, :query_cache_enabled
#query_cache_enabled (readonly)
[ GitHub ]# File 'activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb', line 53
attr_reader :query_cache, :query_cache_enabled
Instance Method Details
#cache
Enable the query cache within the block.
# File 'activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb', line 63
def cache old, @query_cache_enabled = @query_cache_enabled, true yield ensure @query_cache_enabled = old clear_query_cache unless @query_cache_enabled 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 94
def clear_query_cache @lock.synchronize do @query_cache.clear end end
#disable_query_cache!
[ GitHub ]# File 'activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb', line 75
def disable_query_cache! @query_cache_enabled = false clear_query_cache end
#enable_query_cache!
[ GitHub ]# File 'activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb', line 71
def enable_query_cache! @query_cache_enabled = true end
#initialize
[ GitHub ]# File 'activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb', line 55
def initialize(*) super @query_cache = {} @query_cache_enabled = false @query_cache_max_size = nil end
#uncached
Disable the query cache within the block.
# File 'activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb', line 81
def uncached old, @query_cache_enabled = @query_cache_enabled, false yield ensure @query_cache_enabled = old end