Ransack habtm broken for postgres UUID

# test-ransacker-arel-present-predicate.rb

# Run it in your console with: `ruby test-ransacker-arel-present-predicate.rb`

# If you change the gem dependencies, run it with:
# `rm gemfile* && ruby test-ransacker-arel-present-predicate.rb`

unless File.exist?('Gemfile')
  File.write('Gemfile', <<-GEMFILE)
    source 'https://rubygems.org'

    # Rails master
    gem 'rails', '5.0.0'

    gem 'sqlite3'
    gem 'ransack'
    gem 'activeuuid'
    gem 'pg'
  GEMFILE

  system 'bundle install'
end

require 'bundler'
Bundler.setup(:default)

require 'minitest/autorun'
require 'logger'
require 'active_record'
require 'ransack'

database = YAML.load File.read('database.yml')
puts database['development']
# This connection will do for database-independent bug reports.
 ActiveRecord::Base.establish_connection(database['development'])
 ActiveRecord::Base.logger = Logger.new(STDOUT)

ActiveRecord::Schema.define do
  break if ActiveRecord::Base.connection.data_source_exists? :students

  enable_extension "uuid-ossp"
  create_table :students, id: :uuid, default: -> { "uuid_generate_v4()" } do |t|
    t.string :name
  end

  create_table :groups do |t|
    t.string :name
  end

  create_table :teachers do |t|
    t.string :name
  end

  create_join_table :groups, :students
  create_join_table :groups, :teachers
end

class Student < ActiveRecord::Base
  has_and_belongs_to_many :groups
end

class Teacher < ActiveRecord::Base
  has_and_belongs_to_many :groups
end

class Group < ActiveRecord::Base
end

class BugTest < Minitest::Test
  def test_ransackers
    result_sql = Student.ransack({groups_id_eq: 2}).result.to_sql
    expected_sql = 'SELECT "students".* FROM "students" LEFT OUTER JOIN "groups_students" ON "groups_students"."student_id" = "students"."id" LEFT OUTER JOIN "groups" ON "groups"."id" = "groups_students"."group_id" WHERE "groups"."id" = 2'
    #This fails
    assert_equal expected_sql, result_sql

    result_sql = Teacher.ransack({groups_id_eq: 2}).result.to_sql
    expected_sql = 'SELECT "teachers".* FROM "teachers" LEFT OUTER JOIN "groups_teachers" ON "groups_teachers"."teacher_id" = "teachers"."id" LEFT OUTER JOIN "groups" ON "groups"."id" = "groups_teachers"."group_id" WHERE "groups"."id" = 2'
    #This passes
    assert_equal expected_sql, result_sql
  end
end