Module: ActiveRecord::ConnectionAdapters::QueryCache
- Defined in:
- lib/active_record/connection_adapters/abstract/query_cache.rb
Class Method Summary collapse
Instance Method Summary collapse
-
#cache ⇒ Object
Enable the query cache within the block.
-
#clear_query_cache ⇒ Object
Clears the query cache.
- #columns_with_query_cache(*args) ⇒ Object
- #select_all_with_query_cache(*args) ⇒ Object
-
#uncached ⇒ Object
Disable the query cache within the block.
Class Method Details
.dirties_query_cache(base, *method_names) ⇒ Object
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# File 'lib/active_record/connection_adapters/abstract/query_cache.rb', line 15 def dirties_query_cache(base, *method_names) method_names.each do |method_name| base.class_eval <<-end_code, __FILE__, __LINE__ def #{method_name}_with_query_dirty(*args) clear_query_cache if @query_cache_enabled #{method_name}_without_query_dirty(*args) end alias_method_chain :#{method_name}, :query_dirty end_code end end |
.included(base) ⇒ Object
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# File 'lib/active_record/connection_adapters/abstract/query_cache.rb', line 5 def included(base) base.class_eval do attr_accessor :query_cache_enabled alias_method_chain :columns, :query_cache alias_method_chain :select_all, :query_cache end dirties_query_cache base, :insert, :update, :delete end |
Instance Method Details
#cache ⇒ Object
Enable the query cache within the block.
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# File 'lib/active_record/connection_adapters/abstract/query_cache.rb', line 30 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 ⇒ Object
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.
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# File 'lib/active_record/connection_adapters/abstract/query_cache.rb', line 53 def clear_query_cache @query_cache.clear if @query_cache end |
#columns_with_query_cache(*args) ⇒ Object
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# File 'lib/active_record/connection_adapters/abstract/query_cache.rb', line 65 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) ⇒ Object
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# File 'lib/active_record/connection_adapters/abstract/query_cache.rb', line 57 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 ⇒ Object
Disable the query cache within the block.
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# File 'lib/active_record/connection_adapters/abstract/query_cache.rb', line 40 def uncached old, @query_cache_enabled = @query_cache_enabled, false yield ensure @query_cache_enabled = old end |