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module ActiveRecord
# = Active Record Query Cache
class QueryCache
module ClassMethods
# Enable the query cache within the block if Active Record is configured.
# If it's not, it will execute the given block.
def cache(&block)
if ActiveRecord::Base.connected?
connection.cache(&block)
else
yield
end
end
# Disable the query cache within the block if Active Record is configured.
# If it's not, it will execute the given block.
def uncached(&block)
if ActiveRecord::Base.connected?
connection.uncached(&block)
else
yield
end
end
end
def initialize(app)
@app = app
end
def call(env)
connection = ActiveRecord::Base.connection
enabled = connection.query_cache_enabled
connection_id = ActiveRecord::Base.connection_id
connection.enable_query_cache!
response = @app.call(env)
response[2] = Rack::BodyProxy.new(response[2]) do
restore_query_cache_settings(connection_id, enabled)
end
response
rescue Exception => e
restore_query_cache_settings(connection_id, enabled)
raise e
end
private
def restore_query_cache_settings(connection_id, enabled)
ActiveRecord::Base.connection_id = connection_id
ActiveRecord::Base.connection.clear_query_cache
ActiveRecord::Base.connection.disable_query_cache! unless enabled
end
end
end
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