Namespace
Module
Methods
- cache
- clear_query_cache
- dirties_query_cache
- disable_query_cache!
- enable_query_cache!
- new
- select_all
- uncached
Attributes
[R] | query_cache | |
[R] | query_cache_enabled |
Class Public methods
dirties_query_cache(base, *method_names)
Source:
# File activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb, line 16
def dirties_query_cache(base, *method_names)
method_names.each do |method_name|
base.class_eval <<-end_code, __FILE__, __LINE__ + 1
def #{method_name}(*)
clear_query_cache if @query_cache_enabled
super
end
end_code
end
end
new(*)
Source:
# File activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb, line 51
def initialize(*)
super
@query_cache = Hash.new { |h, sql| h[sql] = {} }
@query_cache_enabled = false
end
Instance Public methods
cache()
Enable the query cache within the block.
Source:
# File activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb, line 58
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.
Source:
# File activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb, line 89
def clear_query_cache
@lock.synchronize do
@query_cache.clear
end
end
disable_query_cache!()
Source:
# File activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb, line 70
def disable_query_cache!
@query_cache_enabled = false
clear_query_cache
end
enable_query_cache!()
Source:
# File activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb, line 66
def enable_query_cache!
@query_cache_enabled = true
end
select_all(arel, name = nil, binds = [], preparable: nil)
Source:
# File activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb, line 95
def select_all(arel, name = nil, binds = [], preparable: nil)
if @query_cache_enabled && !locked?(arel)
arel = arel_from_relation(arel)
sql, binds = to_sql_and_binds(arel, binds)
if preparable.nil?
preparable = prepared_statements ? visitor.preparable : false
end
cache_sql(sql, name, binds) { super(sql, name, binds, preparable: preparable) }
else
super
end
end
uncached()
Disable the query cache within the block.
Source:
# File activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb, line 76
def uncached
old, @query_cache_enabled = @query_cache_enabled, false
yield
ensure
@query_cache_enabled = old
end