rr42_active_record pluck and bind values

gistfile1.txt

unless File.exist?('Gemfile')
  File.write('Gemfile', <<-GEMFILE)
    source 'https://rubygems.org'
    gem 'rails', github: 'rails/rails'
    gem 'arel', github: 'rails/arel'
    gem 'sqlite3'
    gem 'pg'
    gem 'byebug'
  GEMFILE

  system 'bundle'
end

require 'bundler'
Bundler.setup(:default)

require 'active_record'
require 'minitest/autorun'
require 'logger'
require 'byebug'

# This connection will do for database-independent bug reports.
ActiveRecord::Base.establish_connection(adapter: 'postgresql', database: 'rails_test', username:'rails')
ActiveRecord::Base.logger = Logger.new(STDOUT)

ActiveRecord::Schema.define do
  create_table "bars", force: true do |t|
    t.integer "object_id"
    t.string  "object_type"
  end
  create_table "foos", force: true do |t|
  end

end

class Foo < ActiveRecord::Base
  has_many :bars, as: :object
end
class Bar < ActiveRecord::Base
  belongs_to :object, polymorphic: true
end

class PluckTest < Minitest::Test
  def test_polymorphic_with_pluck
    scope = Foo.joins(:bars)
    foo = Foo.create()
    Bar.create(object_id:foo.id,object_type:'nop')
    assert_equal 0, scope.count
    assert_equal [], scope.pluck(:id)
  end

end

# PG::ProtocolViolation: ERROR:  bind message supplies 0 parameters, but prepared statement "" requires 1
# : SELECT "foos"."id" FROM "foos" INNER JOIN "bars" ON "bars"."object_id" = "foos"."id" AND "bars"."object_type" = $1
# E

# Finished in 0.026868s, 37.2190 runs/s, 37.2190 assertions/s.

#  1) Error:
# PluckTest#test_polymorphic_with_pluck:
# ActiveRecord::StatementInvalid: PG::ProtocolViolation: ERROR:  bind message supplies 0 parameters, but prepared statement "" requires 1
# : SELECT "foos"."id" FROM "foos" INNER JOIN "bars" ON "bars"."object_id" = "foos"."id" AND "bars"."object_type" = $1
#    /Users/boga/.rvm/gems/ruby-2.0.0-p451/bundler/gems/rails-8e52954349c2/activerecord/lib/active_record/connection_adapters#/postgresql_adapter.rb:592:in `async_exec'
#    /Users/boga/.rvm/gems/ruby-2.0.0-p451/bundler/gems/rails-8e52954349c2/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb:592:in `block in exec_no_cache'
#    /Users/boga/.rvm/gems/ruby-2.0.0-p451/bundler/gems/rails-8e52954349c2/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb:466:in `block in log'
#    /Users/boga/.rvm/gems/ruby-2.0.0-p451/bundler/gems/rails-8e52954349c2/activesupport/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
#    /Users/boga/.rvm/gems/ruby-2.0.0-p451/bundler/gems/rails-8e52954349c2/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb:460:in `log'
#    /Users/boga/.rvm/gems/ruby-2.0.0-p451/bundler/gems/rails-8e52954349c2/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb:592:in `exec_no_cache'
#    /Users/boga/.rvm/gems/ruby-2.0.0-p451/bundler/gems/rails-8e52954349c2/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb:584:in `execute_and_clear'
#    /Users/boga/.rvm/gems/ruby-2.0.0-p451/bundler/gems/rails-8e52954349c2/activerecord/lib/active_record/connection_adapters/postgresql/database_statements.rb:160:in `exec_query'
#    /Users/boga/.rvm/gems/ruby-2.0.0-p451/bundler/gems/rails-8e52954349c2/activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb:336:in `select'
#    /Users/boga/.rvm/gems/ruby-2.0.0-p451/bundler/gems/rails-8e52954349c2/activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb:32:in `select_all'
#    /Users/boga/.rvm/gems/ruby-2.0.0-p451/bundler/gems/rails-8e52954349c2/activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb:70:in `select_all'
#    /Users/boga/.rvm/gems/ruby-2.0.0-p451/bundler/gems/rails-8e52954349c2/activerecord/lib/active_record/relation/calculations.rb:180:in `pluck'
#    pg_test2.rb:51:in `test_polymorphic_with_pluck'
#
# 1 runs, 1 assertions, 0 failures, 1 errors, 0 skips
#
# shell returned 1