ruby - Switching databases in Rails/Postgres is causing error -


i'm trying setup testing environment can simulate writing master database , reading slave database. have parent model before_save , after_save callback switches slave , master.

i'm running error though activerecord::statementinvalid: pg::connectionbad: connection closed: rollback

application_record.rb

class applicationrecord < activerecord::base    self.abstract_class = true    before_save :switch_to_master   after_save :switch_to_slave    def switch_to_slave     config = yaml.load_file(file.join(rails.root, "config", "database.yml"))[rails.env.to_s]     applicationrecord.establish_connection(config)   end    def switch_to_master     config = yaml.load_file(file.join(rails.root, "config", "database_master.yml"))[rails.env.to_s]     applicationrecord.establish_connection(config)   end  end

master_slave_test.rb

require 'test_helper'  class masterslavetest < actioncontroller::testcase    def test_one     @user = users(:john)      @user.update(last_name: 'change')     @user.update(last_name: 'change')       assert "change", @user.reload.last_name   end  end

database.yml

test:   adapter: postgresql   database: autobrain_test_slave   host: localhost

database_master.yml 

test:   adapter: postgresql   database: autobrain_test   host: localhost


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