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tag: v3.1.0.rc8
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require 'active_support/core_ext/object/blank'
module ActiveRecord
# = Active Record Query Cache
class QueryCache
module ClassMethods
# Enable the query cache within the block if Active Record is configured.
def cache(&block)
if ActiveRecord::Base.configurations.blank?
yield
else
connection.cache(&block)
end
end
# Disable the query cache within the block if Active Record is configured.
def uncached(&block)
if ActiveRecord::Base.configurations.blank?
yield
else
connection.uncached(&block)
end
end
end
def initialize(app)
@app = app
end
class BodyProxy # :nodoc:
def initialize(original_cache_value, target)
@original_cache_value = original_cache_value
@target = target
end
def method_missing(method_sym, *arguments, &block)
@target.send(method_sym, *arguments, &block)
end
def respond_to?(method_sym, include_private = false)
super || @target.respond_to?(method_sym)
end
def each(&block)
@target.each(&block)
end
def close
@target.close if @target.respond_to?(:close)
ensure
ActiveRecord::Base.connection.clear_query_cache
unless @original_cache_value
ActiveRecord::Base.connection.disable_query_cache!
end
end
end
def call(env)
old = ActiveRecord::Base.connection.query_cache_enabled
ActiveRecord::Base.connection.enable_query_cache!
status, headers, body = @app.call(env)
[status, headers, BodyProxy.new(old, body)]
rescue Exception => e
ActiveRecord::Base.connection.clear_query_cache
unless old
ActiveRecord::Base.connection.disable_query_cache!
end
raise e
end
end
end
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