module ActiveRecord::ConnectionAdapters::QueryCache
Attributes
[R] | query_cache |
|
[R] | query_cache_enabled |
Public class methods
Source code 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
Source code 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
Public instance methods
Enable the query cache within the block.
Source code GitHub
# 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
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.
Source code GitHub
# 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
Source code 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
Source code GitHub
# File activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb, line 71
def enable_query_cache!
@query_cache_enabled = true
end
Disable the query cache within the block.
Source code GitHub
# 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