sequel_postgresql_triggers_spec.rb

#!/usr/bin/env ruby
require 'sequel'

if coverage = ENV.delete('COVERAGE')
  require 'simplecov'

  SimpleCov.start do
    enable_coverage :branch
    command_name coverage
    add_filter "/spec/"
    add_group('Missing'){|src| src.covered_percent < 100}
    add_group('Covered'){|src| src.covered_percent == 100}
  end
end

ENV['MT_NO_PLUGINS'] = '1' # Work around stupid autoloading of plugins
gem 'minitest'
require 'minitest/global_expectations/autorun'

DB = Sequel.connect(ENV['PGT_SPEC_DB']||'postgres:///spgt_test?user=postgres')

$:.unshift(File.join(File.dirname(File.dirname(File.expand_path(__FILE__))), 'lib'))
if ENV['PGT_GLOBAL'] == '1'
  puts "Running specs with global modification"
  require 'sequel_postgresql_triggers'
else
  puts "Running specs with extension"
  DB.extension :pg_triggers 
end
DB.extension :pg_array

describe "PostgreSQL Counter Cache Trigger" do
  before do
    DB.create_table(:accounts){integer :id; integer :num_entries, :default=>0}
    DB.create_table(:entries){integer :id; integer :account_id}
    DB.pgt_counter_cache(:accounts, :id, :num_entries, :entries, :account_id, :function_name=>:spgt_counter_cache)
    DB[:accounts].insert(:id=>1)
    DB[:accounts].insert(:id=>2)
  end

  after do
    DB.drop_table(:entries, :accounts)
    DB.drop_function(:spgt_counter_cache)
  end

  it "should not modify counter cache if adding/removing records fails due to ON CONFLICT DO NOTHING" do
    DB.alter_table(:entries){add_unique_constraint :account_id}
    DB[:entries].insert(:id=>1, :account_id=>1)
    DB[:accounts].order(:id).select_map(:num_entries).must_equal [1, 0]
    DB[:entries].insert_conflict.insert(:id=>1, :account_id=>1)
    DB[:accounts].order(:id).select_map(:num_entries).must_equal [1, 0]
  end

  it "should modify counter cache when adding or removing records" do
    DB[:accounts].order(:id).select_map(:num_entries).must_equal [0, 0]

    DB[:entries].insert(:id=>1, :account_id=>1)
    DB[:accounts].order(:id).select_map(:num_entries).must_equal [1, 0]

    DB[:entries].insert(:id=>2, :account_id=>1)
    DB[:accounts].order(:id).select_map(:num_entries).must_equal [2, 0]
    
    DB[:entries].insert(:id=>3, :account_id=>nil)
    DB[:accounts].order(:id).select_map(:num_entries).must_equal [2, 0]
    
    DB[:entries].where(:id=>3).update(:account_id=>2)
    DB[:accounts].order(:id).select_map(:num_entries).must_equal [2, 1]
    
    DB[:entries].where(:id=>2).update(:account_id=>2)
    DB[:accounts].order(:id).select_map(:num_entries).must_equal [1, 2]
    
    DB[:entries].where(:id=>2).update(:account_id=>nil)
    DB[:accounts].order(:id).select_map(:num_entries).must_equal [1, 1]
    
    DB[:entries].where(:id=>2).update(:id=>4)
    DB[:accounts].order(:id).select_map(:num_entries).must_equal [1, 1]
    
    DB[:entries].where(:id=>4).update(:account_id=>2)
    DB[:accounts].order(:id).select_map(:num_entries).must_equal [1, 2]
    
    DB[:entries].where(:id=>4).update(:account_id=>nil)
    DB[:accounts].order(:id).select_map(:num_entries).must_equal [1, 1]
    
    DB[:entries].filter(:id=>4).delete
    DB[:accounts].order(:id).select_map(:num_entries).must_equal [1, 1]
    
    DB[:entries].delete
    DB[:accounts].order(:id).select_map(:num_entries).must_equal [0, 0]
  end
end

describe "PostgreSQL Created At Trigger" do
  before do
    DB.create_table(:accounts){integer :id; timestamp :added_on}
    DB.pgt_created_at(:accounts, :added_on, :function_name=>:spgt_created_at)
  end

  after do
    DB.drop_table(:accounts)
    DB.drop_function(:spgt_created_at)
  end

  it "should set the column upon insertion and ignore modifications afterward" do
    DB[:accounts].insert(:id=>1)
    t = DB[:accounts].get(:added_on)
    t.strftime('%F').must_equal Date.today.strftime('%F')
    DB[:accounts].update(:added_on=>Date.today - 60)
    DB[:accounts].get(:added_on).must_equal t
    DB[:accounts].insert(:id=>2)
    ds = DB[:accounts].select(:added_on)
    DB[:accounts].select((Sequel::SQL::NumericExpression.new(:NOOP, ds.filter(:id=>2)) > ds.filter(:id=>1)).as(:x)).first[:x].must_equal true
    DB[:accounts].filter(:id=>1).update(:id=>3)
    DB[:accounts].select((Sequel::SQL::NumericExpression.new(:NOOP, ds.filter(:id=>2)) > ds.filter(:id=>3)).as(:x)).first[:x].must_equal true
  end
end

describe "PostgreSQL Immutable Trigger" do
  before do
    DB.create_table(:accounts){integer :id; integer :balance, :default=>0}
    DB.pgt_immutable(:accounts, :balance, :function_name=>:spgt_immutable)
    DB[:accounts].insert(:id=>1)
  end

  after do
    DB.drop_table(:accounts)
    DB.drop_function(:spgt_immutable)
  end

  it "should allow modifying columns not marked as immutable" do
    DB[:accounts].update(:id=>2)
  end

  it "should allow updating a column to its existing value" do
    DB[:accounts].update(:balance=>0)
    DB[:accounts].update(:balance=>Sequel.*(:balance, :balance))
  end

  it "should not allow modifying a column's value" do
    proc{DB[:accounts].update(:balance=>1)}.must_raise(Sequel::DatabaseError)
  end

  it "should handle NULL values correctly" do
    proc{DB[:accounts].update(:balance=>nil)}.must_raise(Sequel::DatabaseError)
    DB[:accounts].delete
    DB[:accounts].insert(:id=>1, :balance=>nil)
    DB[:accounts].update(:balance=>nil)
    proc{DB[:accounts].update(:balance=>0)}.must_raise(Sequel::DatabaseError)
  end
end

describe "PostgreSQL Immutable Trigger" do
  before do
    DB.create_table(:accounts){integer :id; integer :balance, :default=>0}
    DB.pgt_immutable(:accounts, :balance)
    DB[:accounts].insert(:id=>1)
  end

  after do
    DB.drop_table(:accounts)
    DB.drop_function(:pgt_im_balance)
  end

  it "should work when called without options" do
    DB[:accounts].update(:id=>2)
  end
end

describe "PostgreSQL Sum Cache Trigger" do
  before do
    DB.create_table(:accounts){integer :id; integer :balance, :default=>0}
    DB.create_table(:entries){integer :id; integer :account_id; integer :amount}
    DB.pgt_sum_cache(:accounts, :id, :balance, :entries, :account_id, :amount, :function_name=>:spgt_sum_cache)
    DB[:accounts].insert(:id=>1)
    DB[:accounts].insert(:id=>2)
  end

  after do
    DB.drop_table(:entries, :accounts)
    DB.drop_function(:spgt_sum_cache)
  end

  it "should not modify sum cache if adding/removing records fails due to ON CONFLICT DO NOTHING" do
    DB.alter_table(:entries){add_unique_constraint :account_id}
    DB[:entries].insert(:id=>1, :account_id=>1, :amount=>5)
    DB[:accounts].order(:id).select_map(:balance).must_equal [5, 0]
    DB[:entries].insert_conflict.insert(:id=>1, :account_id=>1, :amount=>10)
    DB[:accounts].order(:id).select_map(:balance).must_equal [5, 0]
  end

  it "should modify sum cache when adding, updating, or removing records" do
    DB[:accounts].order(:id).select_map(:balance).must_equal [0, 0]

    DB[:entries].insert(:id=>1, :account_id=>1, :amount=>100)
    DB[:accounts].order(:id).select_map(:balance).must_equal [100, 0]

    DB[:entries].insert(:id=>2, :account_id=>1, :amount=>200)
    DB[:accounts].order(:id).select_map(:balance).must_equal [300, 0]
    
    DB[:entries].insert(:id=>3, :account_id=>nil, :amount=>500)
    DB[:accounts].order(:id).select_map(:balance).must_equal [300, 0]
    
    DB[:entries].where(:id=>3).update(:account_id=>2)
    DB[:accounts].order(:id).select_map(:balance).must_equal [300, 500]
    
    DB[:entries].exclude(:id=>2).update(:amount=>Sequel.*(:amount, 2))
    DB[:accounts].order(:id).select_map(:balance).must_equal [400, 1000]
    
    DB[:entries].where(:id=>2).update(:account_id=>2)
    DB[:accounts].order(:id).select_map(:balance).must_equal [200, 1200]
    
    DB[:entries].where(:id=>2).update(:account_id=>nil)
    DB[:accounts].order(:id).select_map(:balance).must_equal [200, 1000]
    
    DB[:entries].where(:id=>2).update(:id=>4)
    DB[:accounts].order(:id).select_map(:balance).must_equal [200, 1000]
    
    DB[:entries].where(:id=>4).update(:account_id=>2)
    DB[:accounts].order(:id).select_map(:balance).must_equal [200, 1200]
    
    DB[:entries].where(:id=>4).update(:account_id=>nil)
    DB[:accounts].order(:id).select_map(:balance).must_equal [200, 1000]
    
    DB[:entries].filter(:id=>4).delete
    DB[:accounts].order(:id).select_map(:balance).must_equal [200, 1000]
    
    DB[:entries].delete
    DB[:accounts].order(:id).select_map(:balance).must_equal [0, 0]
  end
end

describe "PostgreSQL Sum Cache Trigger with arbitrary expression" do
  before do
    DB.create_table(:accounts){integer :id; integer :nonzero_entries_count, :default=>0}
    DB.create_table(:entries){integer :id; integer :account_id; integer :amount}
    DB.pgt_sum_cache(:accounts, :id, :nonzero_entries_count, :entries, :account_id, Sequel.case({0=>0}, 1, :amount), :function_name=>:spgt_sum_cache)
    DB[:accounts].insert(:id=>1)
    DB[:accounts].insert(:id=>2)
  end

  after do
    DB.drop_table(:entries, :accounts)
    DB.drop_function(:spgt_sum_cache)
  end

  it "should modify sum cache when adding, updating, or removing records" do
    DB[:accounts].order(:id).select_map(:nonzero_entries_count).must_equal [0, 0]

    DB[:entries].insert(:id=>1, :account_id=>1, :amount=>100)
    DB[:accounts].order(:id).select_map(:nonzero_entries_count).must_equal [1, 0]

    DB[:entries].insert(:id=>2, :account_id=>1, :amount=>200)
    DB[:accounts].order(:id).select_map(:nonzero_entries_count).must_equal [2, 0]

    DB[:entries].insert(:id=>3, :account_id=>nil, :amount=>500)
    DB[:accounts].order(:id).select_map(:nonzero_entries_count).must_equal [2, 0]

    DB[:entries].where(:id=>3).update(:account_id=>2)
    DB[:accounts].order(:id).select_map(:nonzero_entries_count).must_equal [2, 1]

    DB[:entries].exclude(:id=>2).update(:amount=>Sequel.*(:amount, 2))
    DB[:accounts].order(:id).select_map(:nonzero_entries_count).must_equal [2, 1]

    DB[:entries].where(:id=>2).update(:account_id=>2)
    DB[:accounts].order(:id).select_map(:nonzero_entries_count).must_equal [1, 2]

    DB[:entries].where(:id=>2).update(:account_id=>nil)
    DB[:accounts].order(:id).select_map(:nonzero_entries_count).must_equal [1, 1]

    DB[:entries].where(:id=>2).update(:id=>4)
    DB[:accounts].order(:id).select_map(:nonzero_entries_count).must_equal [1, 1]

    DB[:entries].where(:id=>4).update(:account_id=>2)
    DB[:accounts].order(:id).select_map(:nonzero_entries_count).must_equal [1, 2]

    DB[:entries].where(:id=>4).update(:account_id=>nil)
    DB[:accounts].order(:id).select_map(:nonzero_entries_count).must_equal [1, 1]

    DB[:entries].filter(:id=>4).delete
    DB[:accounts].order(:id).select_map(:nonzero_entries_count).must_equal [1, 1]

    DB[:entries].delete
    DB[:accounts].order(:id).select_map(:nonzero_entries_count).must_equal [0, 0]
  end
end


describe "PostgreSQL Sum Through Many Cache Trigger" do
  before do
    DB.create_table(:parents){primary_key :id; integer :balance, :default=>0, :null=>false}
    DB.create_table(:children){primary_key :id; integer :amount, :null=>false}
    DB.create_table(:links){integer :parent_id, :null=>false; integer :child_id, :null=>false; unique [:parent_id, :child_id]}
    DB.pgt_sum_through_many_cache(
      :main_table=>:parents,
      :sum_column=>:balance,
      :summed_table=>:children,
      :summed_column=>:amount,
      :join_table=>:links,
      :main_table_fk_column=>:parent_id,
      :summed_table_fk_column=>:child_id,
      :function_name=>:spgt_stm_cache,
      :join_function_name=>:spgt_stm_cache_join
    )
    DB[:parents].insert(:id=>1)
    DB[:parents].insert(:id=>2)
  end

  after do
    DB.drop_table(:links, :parents, :children)
    DB.drop_function(:spgt_stm_cache)
    DB.drop_function(:spgt_stm_cache_join)
  end

  it "should not modify sum cache if adding/removing records fails due to ON CONFLICT DO NOTHING" do
    DB.alter_table(:children){add_unique_constraint :amount}
    DB[:children].insert(:id=>1, :amount=>5)
    DB[:links].insert(:parent_id=>1, :child_id=>1)
    DB[:parents].order(:id).select_map(:balance).must_equal [5, 0]
    DB[:children].insert_conflict.insert(:id=>1, :amount=>5)
    DB[:parents].order(:id).select_map(:balance).must_equal [5, 0]
    DB[:links].insert_conflict.insert(:parent_id=>1, :child_id=>1)
    DB[:parents].order(:id).select_map(:balance).must_equal [5, 0]
  end

  it "should modify sum cache when adding, updating, or removing records" do
    DB[:parents].order(:id).select_map(:balance).must_equal [0, 0]

    DB[:children].insert(:id=>1, :amount=>100)
    DB[:links].insert(:parent_id=>1, :child_id=>1)
    DB[:parents].order(:id).select_map(:balance).must_equal [100, 0]

    DB[:children].insert(:id=>2, :amount=>200)
    DB[:links].insert(:parent_id=>1, :child_id=>2)
    DB[:parents].order(:id).select_map(:balance).must_equal [300, 0]

    DB[:children].insert(:id=>3, :amount=>500)
    DB[:parents].order(:id).select_map(:balance).must_equal [300, 0]
    DB[:links].insert(:parent_id=>2, :child_id=>3)
    DB[:parents].order(:id).select_map(:balance).must_equal [300, 500]

    DB[:links].where(:parent_id=>2, :child_id=>3).update(:parent_id=>1)
    DB[:parents].order(:id).select_map(:balance).must_equal [800, 0]

    DB[:children].insert(:id=>4, :amount=>400)
    DB[:links].where(:parent_id=>1, :child_id=>3).update(:child_id=>4)
    DB[:parents].order(:id).select_map(:balance).must_equal [700, 0]

    DB[:links].where(:parent_id=>1, :child_id=>4).update(:parent_id=>2, :child_id=>3)
    DB[:parents].order(:id).select_map(:balance).must_equal [300, 500]

    DB[:children].exclude(:id=>2).update(:amount=>Sequel.*(:amount, 2))
    DB[:parents].order(:id).select_map(:balance).must_equal [400, 1000]

    DB[:links].where(:parent_id=>1, :child_id=>2).update(:parent_id=>2)
    DB[:parents].order(:id).select_map(:balance).must_equal [200, 1200]

    DB[:links].where(:parent_id=>2, :child_id=>2).update(:parent_id=>1)
    DB[:parents].order(:id).select_map(:balance).must_equal [400, 1000]

    DB[:links].where(:parent_id=>1, :child_id=>2).update(:child_id=>3)
    DB[:parents].order(:id).select_map(:balance).must_equal [1200, 1000]

    DB[:links].insert(:parent_id=>2, :child_id=>4)
    DB[:parents].order(:id).select_map(:balance).must_equal [1200, 1800]

    DB[:children].filter(:id=>4).delete
    DB[:parents].order(:id).select_map(:balance).must_equal [1200, 1000]

    DB[:links].filter(:parent_id=>1, :child_id=>1).delete
    DB[:parents].order(:id).select_map(:balance).must_equal [1000, 1000]

    DB[:children].insert(:id=>4, :amount=>400)
    DB[:parents].order(:id).select_map(:balance).must_equal [1000, 1400]

    DB[:children].delete
    DB[:parents].order(:id).select_map(:balance).must_equal [0, 0]

    DB[:children].multi_insert([{:id=>2, :amount=>200}, {:id=>1, :amount=>200}, {:id=>3, :amount=>1000}, {:id=>4, :amount=>400}])
    DB[:parents].order(:id).select_map(:balance).must_equal [1000, 1400]

    DB[:links].where(:child_id=>3).update(:child_id=>2)
    DB[:parents].order(:id).select_map(:balance).must_equal [200, 600]

    DB[:children].update(:amount=>10)
    DB[:parents].order(:id).select_map(:balance).must_equal [10, 20]

    DB[:links].delete
    DB[:parents].order(:id).select_map(:balance).must_equal [0, 0]
  end
end

describe "PostgreSQL Sum Through Many Cache Trigger with arbitrary expression" do
  before do
    DB.create_table(:parents){primary_key :id; integer :nonzero_entries_count, :default=>0, :null=>false}
    DB.create_table(:children){primary_key :id; integer :amount, :null=>false}
    DB.create_table(:links){integer :parent_id, :null=>false; integer :child_id, :null=>false; unique [:parent_id, :child_id]}
    DB.pgt_sum_through_many_cache(
      :main_table=>:parents,
      :sum_column=>:nonzero_entries_count,
      :summed_table=>:children,
      :summed_column=>Sequel.case({0=>0}, 1, :amount),
      :join_table=>:links,
      :main_table_fk_column=>:parent_id,
      :summed_table_fk_column=>:child_id,
      :function_name=>:spgt_stm_cache,
      :join_function_name=>:spgt_stm_cache_join
    )
    DB[:parents].insert(:id=>1)
    DB[:parents].insert(:id=>2)
  end

  after do
    DB.drop_table(:links, :parents, :children)
    DB.drop_function(:spgt_stm_cache)
    DB.drop_function(:spgt_stm_cache_join)
  end

  it "should modify sum cache when adding, updating, or removing records" do
    DB[:parents].order(:id).select_map(:nonzero_entries_count).must_equal [0, 0]

    DB[:children].insert(:id=>1, :amount=>100)
    DB[:links].insert(:parent_id=>1, :child_id=>1)
    DB[:parents].order(:id).select_map(:nonzero_entries_count).must_equal [1, 0]

    DB[:children].insert(:id=>2, :amount=>200)
    DB[:links].insert(:parent_id=>1, :child_id=>2)
    DB[:parents].order(:id).select_map(:nonzero_entries_count).must_equal [2, 0]

    DB[:children].insert(:id=>3, :amount=>500)
    DB[:parents].order(:id).select_map(:nonzero_entries_count).must_equal [2, 0]
    DB[:links].insert(:parent_id=>2, :child_id=>3)
    DB[:parents].order(:id).select_map(:nonzero_entries_count).must_equal [2, 1]

    DB[:links].where(:parent_id=>2, :child_id=>3).update(:parent_id=>1)
    DB[:parents].order(:id).select_map(:nonzero_entries_count).must_equal [3, 0]

    DB[:children].insert(:id=>4, :amount=>400)
    DB[:links].where(:parent_id=>1, :child_id=>3).update(:child_id=>4)
    DB[:parents].order(:id).select_map(:nonzero_entries_count).must_equal [3, 0]

    DB[:links].where(:parent_id=>1, :child_id=>4).update(:parent_id=>2, :child_id=>3)
    DB[:parents].order(:id).select_map(:nonzero_entries_count).must_equal [2, 1]

    DB[:children].exclude(:id=>2).update(:amount=>Sequel.*(:amount, 2))
    DB[:parents].order(:id).select_map(:nonzero_entries_count).must_equal [2, 1]

    DB[:links].where(:parent_id=>1, :child_id=>2).update(:parent_id=>2)
    DB[:parents].order(:id).select_map(:nonzero_entries_count).must_equal [1, 2]

    DB[:links].where(:parent_id=>2, :child_id=>2).update(:parent_id=>1)
    DB[:parents].order(:id).select_map(:nonzero_entries_count).must_equal [2, 1]

    DB[:links].where(:parent_id=>1, :child_id=>2).update(:child_id=>3)
    DB[:parents].order(:id).select_map(:nonzero_entries_count).must_equal [2, 1]

    DB[:links].insert(:parent_id=>2, :child_id=>4)
    DB[:parents].order(:id).select_map(:nonzero_entries_count).must_equal [2, 2]

    DB[:children].filter(:id=>4).delete
    DB[:parents].order(:id).select_map(:nonzero_entries_count).must_equal [2, 1]

    DB[:links].filter(:parent_id=>1, :child_id=>1).delete
    DB[:parents].order(:id).select_map(:nonzero_entries_count).must_equal [1, 1]

    DB[:children].insert(:id=>4, :amount=>400)
    DB[:parents].order(:id).select_map(:nonzero_entries_count).must_equal [1, 2]

    DB[:children].delete
    DB[:parents].order(:id).select_map(:nonzero_entries_count).must_equal [0, 0]

    DB[:children].multi_insert([{:id=>2, :amount=>200}, {:id=>1, :amount=>200}, {:id=>3, :amount=>1000}, {:id=>4, :amount=>400}])
    DB[:parents].order(:id).select_map(:nonzero_entries_count).must_equal [1, 2]

    DB[:links].where(:child_id=>3).update(:child_id=>2)
    DB[:parents].order(:id).select_map(:nonzero_entries_count).must_equal [1, 2]

    DB[:children].update(:amount=>10)
    DB[:parents].order(:id).select_map(:nonzero_entries_count).must_equal [1, 2]

    DB[:links].delete
    DB[:parents].order(:id).select_map(:nonzero_entries_count).must_equal [0, 0]
  end
end

describe "PostgreSQL Sum Through Many Cache Trigger with circular relation" do
  before do
    DB.create_table(:people) do
      primary_key :id;
      integer :amount, :null=>false, :default=>0;
      integer :nonzero_entries_count, :default=>0, :null=>false
    end
    DB.create_table(:followings){integer :followee_id, :null=>false; integer :follower_id, :null=>false;}
    DB.pgt_sum_through_many_cache(
      :main_table=>:people,
      :sum_column=>:nonzero_entries_count,
      :summed_table=>:people,
      :summed_column=>Sequel.case({0=>0}, 1, :amount),
      :join_table=>:followings,
      :main_table_fk_column=>:followee_id,
      :summed_table_fk_column=>:follower_id,
      :function_name=>:spgt_stm_cache,
      :join_function_name=>:spgt_stm_cache_join,
      :prevent_depth=>true
    )
    DB[:people].insert(:id=>1)
    DB[:people].insert(:id=>2)
  end

  after do
    DB.drop_table(:followings, :people)
    DB.drop_function(:spgt_stm_cache)
    DB.drop_function(:spgt_stm_cache_join)
  end

  it "should count mutual reference" do
    DB[:people].order(:id).select_map(:nonzero_entries_count).must_equal [0, 0]
    DB[:followings].insert(:followee_id=>1, :follower_id=>2)
    DB[:followings].insert(:followee_id=>2, :follower_id=>1)
    DB[:people].order(:id).select_map(:nonzero_entries_count).must_equal [0, 0]
    DB[:people].update(:amount=>1)
    DB[:people].order(:id).select_map(:nonzero_entries_count).must_equal [1, 1]
  end

  it "should modify sum cache when adding, updating, or removing join records and records" do
    DB[:people].order(:id).select_map(:nonzero_entries_count).must_equal [0, 0]

    DB[:people].update(:amount=>1)
    DB[:people].order(:id).select_map(:nonzero_entries_count).must_equal [0, 0]

    DB[:followings].insert(:followee_id=>1, :follower_id=>2)
    DB[:people].order(:id).select_map(:nonzero_entries_count).must_equal [1, 0]

    DB[:followings].where(:followee_id=>1, :follower_id=>2).update(:followee_id=>2, :follower_id=>1)
    DB[:people].order(:id).select_map(:nonzero_entries_count).must_equal [0, 1]

    DB[:followings].where(:followee_id=>2, :follower_id=>1).delete
    DB[:people].order(:id).select_map(:nonzero_entries_count).must_equal [0, 0]

    DB[:people].insert(:id=>3)
    DB[:followings].insert(:followee_id=>1, :follower_id=>2)
    DB[:followings].insert(:followee_id=>1, :follower_id=>3)
    DB[:followings].insert(:followee_id=>2, :follower_id=>3)
    DB[:people].order(:id).select_map(:nonzero_entries_count).must_equal [1, 0, 0]

    DB[:people].where(:id=>3).update(:amount=>1000)
    DB[:people].order(:id).select_map(:nonzero_entries_count).must_equal [2, 1, 0]

    DB[:people].where(:id=>3).delete
    DB[:people].order(:id).select_map(:nonzero_entries_count).must_equal [1, 0]
  end
end

describe "PostgreSQL Updated At Trigger" do
  before do
    DB.create_table(:accounts){integer :id; timestamp :changed_on}
    DB.pgt_updated_at(:accounts, :changed_on, :function_name=>:spgt_updated_at)
  end

  after do
    DB.drop_table(:accounts)
    DB.drop_function(:spgt_updated_at)
  end

  it "should set the column always to the current timestamp" do
    DB[:accounts].insert(:id=>1)
    t = DB[:accounts].get(:changed_on)
    t.strftime('%F').must_equal Date.today.strftime('%F')
    DB[:accounts].insert(:id=>2)
    ds = DB[:accounts].select(:changed_on)
    DB[:accounts].select((Sequel::SQL::NumericExpression.new(:NOOP, ds.filter(:id=>2)) > ds.filter(:id=>1)).as(:x)).first[:x].must_equal true
    DB[:accounts].filter(:id=>1).update(:id=>3)
    DB[:accounts].select((Sequel::SQL::NumericExpression.new(:NOOP, ds.filter(:id=>3)) > ds.filter(:id=>2)).as(:x)).first[:x].must_equal true
  end
end

describe "PostgreSQL Touch Trigger" do
  before do
    DB.create_table(:parents){integer :id1; integer :id2; integer :child_id; timestamp :changed_on}
    DB.create_table(:children){integer :id; integer :parent_id1; integer :parent_id2; timestamp :changed_on}
  end

  after do
    DB.drop_table(:children, :parents)
    DB.drop_function(:spgt_touch)
    DB.drop_function(:spgt_touch2) if @spgt_touch2
  end

  it "should not modify timestamp column of related table if adding/removing records fails due to ON CONFLICT DO NOTHING" do
    DB.pgt_touch(:children, :parents, :changed_on, {:id1=>:parent_id1}, :function_name=>:spgt_touch)
    DB.alter_table(:children){add_unique_constraint :parent_id1}
    d30 = Date.today - 30
    DB[:children].insert(:id=>1, :parent_id1=>1)
    DB[:parents].insert(:id1=>1, :changed_on=>d30)
    DB[:parents].get(:changed_on).to_date.must_equal d30
    DB[:children].insert_conflict.insert(:id=>1, :parent_id1=>1)
    DB[:parents].get(:changed_on).to_date.must_equal d30
  end

  it "should update the timestamp column of the related table when adding, updating or removing records" do
    DB.pgt_touch(:children, :parents, :changed_on, {:id1=>:parent_id1}, :function_name=>:spgt_touch)
    d = Date.today
    d30 = Date.today - 30
    DB[:parents].insert(:id1=>1, :changed_on=>d30)
    DB[:parents].insert(:id1=>2, :changed_on=>d30)
    DB[:children].insert(:id=>1, :parent_id1=>1)
    DB[:parents].order(:id1).select_map(:changed_on).map{|t| t.strftime('%F')}.must_equal [d.strftime('%F'), d30.strftime('%F')]

    DB[:parents].update(:changed_on=>d30)
    DB[:children].update(:id=>2)
    DB[:parents].order(:id1).select_map(:changed_on).map{|t| t.strftime('%F')}.must_equal [d.strftime('%F'), d30.strftime('%F')]

    DB[:parents].update(:changed_on=>d30)
    DB[:children].update(:parent_id1=>2)
    DB[:parents].order(:id1).select_map(:changed_on).map{|t| t.strftime('%F')}.must_equal [d.strftime('%F'), d.strftime('%F')]

    DB[:parents].update(:changed_on=>d30)
    DB[:children].update(:parent_id1=>nil)
    DB[:parents].order(:id1).select_map(:changed_on).map{|t| t.strftime('%F')}.must_equal [d30.strftime('%F'), d.strftime('%F')]

    DB[:parents].update(:changed_on=>d30)
    DB[:children].update(:parent_id2=>1)
    DB[:parents].order(:id1).select_map(:changed_on).map{|t| t.strftime('%F')}.must_equal [d30.strftime('%F'), d30.strftime('%F')]

    DB[:parents].update(:changed_on=>d30)
    DB[:children].update(:parent_id1=>2)
    DB[:parents].order(:id1).select_map(:changed_on).map{|t| t.strftime('%F')}.must_equal [d30.strftime('%F'), d.strftime('%F')]

    DB[:parents].update(:changed_on=>d30)
    DB[:children].delete
    DB[:parents].order(:id1).select_map(:changed_on).map{|t| t.strftime('%F')}.must_equal [d30.strftime('%F'), d.strftime('%F')]

    DB[:parents].update(:changed_on=>d30)
    DB[:children].insert(:id=>2, :parent_id1=>nil)
    DB[:parents].order(:id1).select_map(:changed_on).map{|t| t.strftime('%F')}.must_equal [d30.strftime('%F'), d30.strftime('%F')]
    DB[:children].where(:id=>2).delete
    DB[:parents].order(:id1).select_map(:changed_on).map{|t| t.strftime('%F')}.must_equal [d30.strftime('%F'), d30.strftime('%F')]
  end

  it "should update the timestamp column of the related table when there is a composite foreign key" do
    DB.pgt_touch(:children, :parents, :changed_on, {:id1=>:parent_id1, :id2=>:parent_id2}, :function_name=>:spgt_touch)
    DB[:parents].insert(:id1=>1, :id2=>2, :changed_on=>Date.today - 30)
    DB[:children].insert(:id=>1, :parent_id1=>1, :parent_id2=>2)
    DB[:parents].get(:changed_on).strftime('%F').must_equal Date.today.strftime('%F')
    DB[:parents].update(:changed_on=>Date.today - 30)
    DB[:children].update(:id=>2)
    DB[:parents].get(:changed_on).strftime('%F').must_equal Date.today.strftime('%F')
    DB[:parents].update(:changed_on=>Date.today - 30)
    DB[:children].delete
    DB[:parents].get(:changed_on).strftime('%F').must_equal Date.today.strftime('%F')
  end

  it "should update timestamps correctly when two tables touch each other" do
    DB.pgt_touch(:children, :parents, :changed_on, {:id1=>:parent_id1}, :function_name=>:spgt_touch)
    @spgt_touch2 = true
    DB.pgt_touch(:parents, :children, :changed_on, {:id=>:child_id}, :function_name=>:spgt_touch2)
    DB[:parents].insert(:id1=>1, :child_id=>1, :changed_on=>Date.today - 30)
    DB[:children].insert(:id=>1, :parent_id1=>1, :changed_on=>Date.today - 30)
    DB[:parents].get(:changed_on).strftime('%F').must_equal Date.today.strftime('%F')
    DB[:children].get(:changed_on).strftime('%F').must_equal Date.today.strftime('%F')
    time = DB[:parents].get(:changed_on)
    DB[:parents].update(:id2=>4)
    DB[:parents].get(:changed_on).must_be :>,  time
    DB[:children].get(:changed_on).must_be :>,  time
    time = DB[:parents].get(:changed_on)
    DB[:children].update(:id=>1)
    DB[:parents].get(:changed_on).must_be :>,  time
    DB[:children].get(:changed_on).must_be :>,  time
    time = DB[:parents].get(:changed_on)
    DB[:children].delete
    DB[:parents].get(:changed_on).must_be :>,  time
  end

  it "should update the timestamp on the related table if that timestamp is initially NULL" do
    DB.pgt_touch(:children, :parents, :changed_on, {:id1=>:parent_id1}, :function_name=>:spgt_touch)
    DB[:parents].insert(:id1=>1, :changed_on=>nil)
    DB[:children].insert(:id=>1, :parent_id1=>1)
    changed_on = DB[:parents].get(:changed_on)
    changed_on.wont_equal nil
    changed_on.strftime('%F').must_equal Date.today.strftime('%F')
  end
end

describe "PostgreSQL Array Foreign Key Trigger" do
  before do
    DB.create_table(:accounts){Integer :id, :primary_key=>true}
    DB.create_table(:entries){Integer :id, :primary_key=>true; column :account_ids, 'integer[]'}
    DB.pgt_foreign_key_array(:table=>:entries, :column=>:account_ids, :referenced_table=>:accounts, :referenced_column=>:id, :function_name=>:spgt_foreign_key_array, :referenced_function_name=>:spgt_referenced_foreign_key_array)
  end

  after do
    DB.drop_table(:entries, :accounts)
    DB.drop_function(:spgt_foreign_key_array)
    DB.drop_function(:spgt_referenced_foreign_key_array)
  end

  it "should raise error for queries that violate referential integrity, and allow other queries" do
    proc{DB[:entries].insert(:id=>10, :account_ids=>Sequel.pg_array([1]))}.must_raise Sequel::DatabaseError
    DB[:entries].insert(:id=>10, :account_ids=>nil)
    DB[:entries].update(:account_ids=>Sequel.pg_array([], :integer))
    DB[:accounts].insert(:id=>1)
    proc{DB[:entries].insert(:id=>10, :account_ids=>Sequel.pg_array([1, 1]))}.must_raise Sequel::DatabaseError
    DB[:entries].update(:account_ids=>Sequel.pg_array([1]))
    proc{DB[:entries].update(:account_ids=>Sequel.pg_array([2]))}.must_raise Sequel::DatabaseError
    DB[:accounts].insert(:id=>2)
    proc{DB[:entries].insert(:id=>10, :account_ids=>Sequel.pg_array([[1], [2]]))}.must_raise Sequel::DatabaseError
    DB[:entries].update(:account_ids=>Sequel.pg_array([2]))
    DB[:entries].all.must_equal [{:id=>10, :account_ids=>[2]}]
    DB[:entries].update(:account_ids=>Sequel.pg_array([1, 2]))
    DB[:entries].all.must_equal [{:id=>10, :account_ids=>[1, 2]}]
    DB[:entries].update(:account_ids=>Sequel.pg_array([1]))
    DB[:accounts].where(:id=>1).update(:id=>1)
    DB[:accounts].where(:id=>2).update(:id=>3)
    proc{DB[:accounts].where(:id=>1).update(:id=>2)}.must_raise Sequel::DatabaseError
    proc{DB[:accounts].where(:id=>1).delete}.must_raise Sequel::DatabaseError
    DB[:accounts].where(:id=>3).count.must_equal 1
    DB[:accounts].where(:id=>3).delete
    proc{DB[:accounts].delete}.must_raise Sequel::DatabaseError
    DB[:entries].delete
    DB[:accounts].delete
  end
end

describe "PostgreSQL Force Defaults Trigger" do
  before do
    DB.create_table(:accounts){integer :id; integer :a, :default=>0; String :b; integer :c; integer :d, :default=>4}
    DB.pgt_force_defaults(:accounts, {:a=>1, :b=>"'\\a", :c=>nil}, :function_name=>:spgt_force_defaults)
    @ds = DB[:accounts]
  end

  after do
    DB.drop_table(:accounts)
    DB.drop_function(:spgt_force_defaults)
  end

  it "should override default values when inserting" do
    @ds.insert
    DB[:accounts].first.must_equal(:id=>nil, :a=>1, :b=>"'\\a", :c=>nil, :d=>4)

    @ds.delete
    @ds.insert(:id=>10, :a=>11, :b=>12, :c=>13, :d=>14)
    DB[:accounts].first.must_equal(:id=>10, :a=>1, :b=>"'\\a", :c=>nil, :d=>14)
  end
end


describe "PostgreSQL JSON Audit Logging" do
  before do
    DB.extension :pg_json
    DB.create_table(:accounts){integer :id; integer :a}
    DB.pgt_json_audit_log_setup(:table_audit_logs, :function_name=>:spgt_audit_log)
    DB.pgt_json_audit_log(:accounts, :spgt_audit_log)
    @ds = DB[:accounts]
    @ds.insert(:id=>1)
    @logs = DB[:table_audit_logs].reverse(:at)
  end

  after do
    DB.drop_table(:accounts, :table_audit_logs)
    DB.drop_function(:spgt_audit_log)
  end

  it "should store previous values in JSON format in audit table for updates and deletes on main table" do
    @logs.first.must_be_nil

    @ds.update(:id=>2, :a=>3)
    @ds.all.must_equal [{:id=>2, :a=>3}]
    h = @logs.first
    h.delete(:at).to_i.must_be_close_to(10, DB.get(Sequel::CURRENT_TIMESTAMP).to_i)
    h.delete(:user).must_be_kind_of(String)
    txid1 = h.delete(:txid)
    txid1.must_be_kind_of(Integer)
    h.must_equal(:schema=>"public", :table=>"accounts", :action=>"UPDATE", :prior=>{"a"=>nil, "id"=>1})

    @ds.delete
    @ds.all.must_equal []
    h = @logs.first
    h.delete(:at).to_i.must_be_close_to(10, DB.get(Sequel::CURRENT_TIMESTAMP).to_i)
    h.delete(:user).must_be_kind_of(String)
    txid2 = h.delete(:txid)
    txid2.must_be_kind_of(Integer)
    txid2.must_be :>, txid1
    h.must_equal(:schema=>"public", :table=>"accounts", :action=>"DELETE", :prior=>{"a"=>3, "id"=>2})
  end
end if DB.server_version >= 90400