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Add _As Of System Time_ support for models. See https://www.cockroachlabs.com/docs/stable/as-of-system-time Fixes #281
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Original file line number | Diff line number | Diff line change |
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module Arel | ||
module Nodes | ||
module JoinSourceExt | ||
def initialize(...) | ||
super | ||
@aost = nil | ||
end | ||
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def hash | ||
[*super, aost].hash | ||
end | ||
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def eql?(other) | ||
super && aost == other.aost | ||
end | ||
alias_method :==, :eql? | ||
end | ||
JoinSource.attr_accessor :aost | ||
JoinSource.prepend JoinSourceExt | ||
end | ||
module SelectManagerExt | ||
def aost(time) | ||
@ctx.source.aost = time | ||
nil | ||
end | ||
end | ||
SelectManager.prepend SelectManagerExt | ||
end |
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# frozen_string_literal: true | ||
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require "cases/arel/helper" | ||
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module Arel | ||
module Nodes | ||
class TestNodes < Arel::Test | ||
def test_every_arel_nodes_have_hash_eql_eqeq_from_same_class | ||
# #descendants code from activesupport | ||
node_descendants = [] | ||
ObjectSpace.each_object(Arel::Nodes::Node.singleton_class) do |k| | ||
next if k.respond_to?(:singleton_class?) && k.singleton_class? | ||
node_descendants.unshift k unless k == self | ||
end | ||
node_descendants.delete(Arel::Nodes::Node) | ||
node_descendants.delete(Arel::Nodes::NodeExpression) | ||
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default_hash_owner = Object.instance_method(:hash).owner | ||
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bad_node_descendants = node_descendants.reject do |subnode| | ||
eqeq_owner = subnode.instance_method(:==).owner | ||
eql_owner = subnode.instance_method(:eql?).owner | ||
hash_owner = subnode.instance_method(:hash).owner | ||
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hash_owner != default_hash_owner && | ||
eqeq_owner == eql_owner && | ||
eqeq_owner == hash_owner | ||
end | ||
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problem_msg = "Some subclasses of Arel::Nodes::Node do not have a" \ | ||
" #== or #eql? or #hash defined from the same class as the others" | ||
assert_empty bad_node_descendants, problem_msg | ||
end | ||
end | ||
end | ||
end |
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# frozen_string_literal: true | ||
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require "cases/helper_cockroachdb" | ||
require "models/post" | ||
require "models/comment" | ||
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module CockroachDB | ||
class AostTest < ActiveRecord::TestCase | ||
def test_simple_aost | ||
time = 2.days.ago | ||
re_time = Regexp.quote(time.iso8601) | ||
assert_match(/from "posts" as of system time '#{re_time}'/i, Post.aost(time).to_sql) | ||
assert_match(/from "posts" as of system time '#{re_time}'/i, Post.where(name: "foo").aost(time).to_sql) | ||
end | ||
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def test_reset_aost | ||
time = 1.second.from_now | ||
assert_match(/from "posts"\z/i, Post.aost(time).aost(nil).to_sql) | ||
end | ||
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def test_aost_with_join | ||
time = Time.now | ||
assert_match( | ||
/FROM "posts" INNER JOIN "comments" ON "comments"."post_id" = "posts"."id" AS OF SYSTEM TIME '#{Regexp.quote time.iso8601}'/, | ||
Post.joins(:comments).aost(time).to_sql | ||
) | ||
end | ||
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def test_aost_with_subquery | ||
time = 4.seconds.ago | ||
assert_match(/from \(.*?\) subquery as of system time '#{Regexp.quote time.iso8601}'/i, Post.from(Post.where(name: "foo")).aost(time).to_sql) | ||
end | ||
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def test_only_time_input | ||
time = 1.second.ago | ||
expected = "SELECT \"posts\".* FROM \"posts\" AS OF SYSTEM TIME '#{time.iso8601}'" | ||
assert_equal expected, Post.aost(time).to_sql | ||
assert_raises(ArgumentError) { Post.aost("no time") } | ||
assert_raises(ArgumentError) { Post.aost(true) } | ||
end | ||
end | ||
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class AostNoTransactionTest < ActiveRecord::TestCase | ||
# AOST per query is not compatible with transactions. | ||
self.use_transactional_tests = false | ||
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def test_aost_with_multiple_queries | ||
time = 1.second.ago | ||
queries = capture_sql { | ||
Post.aost(time).limit(2).find_each(batch_size: 1).to_a | ||
} | ||
queries.each do | ||
assert_match /FROM \"posts\" AS OF SYSTEM TIME '#{Regexp.quote time.iso8601}'/, _1 | ||
end | ||
end | ||
end | ||
end |
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Original file line number | Diff line number | Diff line change |
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exclude :test_every_arel_nodes_have_hash_eql_eqeq_from_same_class, "Overwitten, see https://github.com/rails/rails/issues/49274" |