title: Rspec and Capybara throw inconsistent Postgresql errors each time I run my tests
body: <p>Postgresql throws various errors or stalls I run my feature test suite which uses Rspec, Capybara-Selenium, and DatabaseCleaner. I can't pin it down because the error changes every time. Sometimes there are no errors at all. I would appreciate any guidance out there. </p>
  
  <p>Here's Error1: </p>
  
  <pre><code>Processing by Api::V1::Company::WagesController#create as JSON
  Parameters: {"wage"=&gt;{"user_id"=&gt;33, "amount"=&gt;"100000"}, "user_id"=&gt;"33"}
  (39.3ms)  SELECT COUNT(*) FROM "users"
  (1.8ms)  BEGIN
  NoMethodError: undefined method `nfields' for nil:NilClass:             SELECT tablename
          FROM pg_tables
          WHERE schemaname = ANY (current_schemas(false))
  
    SQL (12.6ms)  INSERT INTO "wages" ("amount", "created_at", "updated_at", "user_id") VALUES ($1, $2, $3, $4) RETURNING "id"  [["amount", "100000.0"], ["created_at", "2014-06-17 19:47:21.901609"], ["updated_at", "2014-06-17 19:47:21.901609"], ["user_id", 33]]
    (5.1ms)  COMMIT
  </code></pre>
  
  <p>Error2:</p>
  
  <pre><code> Started POST "/api/v1/company/users/2/wages" for 127.0.0.1 at 2014-06-17 15:51:32 -0400
   Processing by Api::V1::Company::WagesController#create as JSON
   Parameters: {"wage"=&gt;{"user_id"=&gt;2, "amount"=&gt;"100000"}, "user_id"=&gt;"2"}
   PG::UndefinedTable: ERROR:  relation "id" does not exist
  :               SELECT a.attname, format_type(a.atttypid, a.atttypmod),
                  pg_get_expr(d.adbin, d.adrelid), a.attnotnull, a.atttypid, a.atttypmod
              FROM pg_attribute a LEFT JOIN pg_attrdef d
                ON a.attrelid = d.adrelid AND a.attnum = d.adnum
             WHERE a.attrelid = '"wages"'::regclass
               AND a.attnum &gt; 0 AND NOT a.attisdropped
             ORDER BY a.attnum
  </code></pre>
  
  <p>Error3:</p>
  
  <pre><code>An error occurred in an after hook
    ActiveRecord::StatementInvalid: PG::NoActiveSqlTransaction: ERROR:  ROLLBACK TO SAVEPOINT can only be used in transaction blocks
  : ROLLBACK TO SAVEPOINT active_record_0
    occurred at /Users/codylittlewood/.rvm/gems/ruby-2.1.1@bitcoinpayroll/gems/activerecord-4.1.1/lib/active_record/connection_adapters/postgresql/database_statements.rb:128:in `async_exec'
  </code></pre>
  
  <p>Error4: (where it just hangs)</p>
  
  <pre><code>(3.2ms)  ALTER TABLE "companies" DISABLE TRIGGER ALL;ALTER TABLE "schema_migrations"     DISABLE TRIGGER ALL;ALTER TABLE "payrolls" DISABLE TRIGGER ALL;ALTER TABLE "payslips" DISABLE    TRIGGER ALL;ALTER TABLE "users" DISABLE TRIGGER ALL;ALTER TABLE "wages" DISABLE TRIGGER ALL
     (18.5ms)  TRUNCATE TABLE "companies", "payrolls", "payslips", "users", "wages" RESTART   IDENTITY CASCADE;
  Started POST "/api/v1/company/users/4/wages" for 127.0.0.1 at 2014-06-17 15:57:41 -0400
  Processing by Api::V1::Company::WagesController#create as JSON
  Parameters: {"wage"=&gt;{"user_id"=&gt;4, "amount"=&gt;"100000"}, "user_id"=&gt;"4"}
  </code></pre>
  
  <p>No code was changed between any of these tests and different errors each time. </p>
  
  <p>Here's my <code>spec_helper.rb</code>:</p>
  
  <pre><code>ENV["RAILS_ENV"] ||= 'test'    
  require File.expand_path("../../config/environment", __FILE__)
  require 'rspec/rails'
  
  RSpec.configure do |config|    
    config.include Devise::TestHelpers, type: :controller
  
    config.include FactoryGirl::Syntax::Methods
  
    # Remove this line if you're not using ActiveRecord or ActiveRecord fixtures
    config.fixture_path = "#{::Rails.root}/spec/fixtures" 
  
    # If you're not using ActiveRecord, or you'd prefer not to run each of your
    # examples within a transaction, remove the following line or assign false
    # instead of true.
    config.use_transactional_fixtures = false
  
    config.before(:suite) do
      DatabaseCleaner.clean_with(:truncation)
    end
  
    config.before(:each) do
      DatabaseCleaner.strategy = :transaction
    end
  
    config.before(:each, :js =&gt; true) do
      DatabaseCleaner.strategy = :truncation
    end
  
    config.before(:each) do
      DatabaseCleaner.start
    end
  
    config.after(:each) do
      DatabaseCleaner.clean
    end
  
    config.infer_base_class_for_anonymous_controllers = false
  
    # Run specs in random order to surface order dependencies. If you find an
    # order dependency and want to debug it, you can fix the order by providing
    # the seed, which is printed after each run.
    #     --seed 1234
    config.order = "random"
  end
  </code></pre>
  
  <p>Here's my feature tests <code>spec/features/user_spec.rb</code>:</p>
  
  <pre><code>require 'spec_helper'          
  include Warden::Test::Helpers  
  Warden.test_mode!              
  
  feature  'Employee management' do
    scenario "adds a new user", :js =&gt; true do
      admin = create(:admin)     
      admin.confirmed_at = Time.now   
      admin.save                 
      login_as(admin, :scope =&gt; :user)
  
  
      visit root_path            
  
      expect{
        #click_link 'Dashboard'  
        click_link 'Company employees'  
        click_link 'Add an employee'    
        fill_in 'employee[first_name]', with: 'Test'
        fill_in 'employee[last_name]', with: 'User'
        fill_in 'employee[email]', with: 'newuser@example.com'
        select "January", from: 'employee[hire_month]'
        select "1", from: 'employee[hire_day]' 
        select "2014", from: 'employee[hire_year]'
        fill_in 'employee[wage]', with: '100000'
        click_button 'Add employee'     
      }.to change(User, :count).by(1) 
      logout :admin
    end
  end
  Warden.test_reset!
  </code></pre>