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rails--rails/activerecord/test/cases/batches_test.rb
2018-02-17 13:58:54 -08:00

663 lines
19 KiB
Ruby

# frozen_string_literal: true
require "cases/helper"
require "models/comment"
require "models/post"
require "models/subscriber"
class EachTest < ActiveRecord::TestCase
fixtures :posts, :subscribers
def setup
@posts = Post.order("id asc")
@total = Post.count
Post.count("id") # preheat arel's table cache
end
def test_each_should_execute_one_query_per_batch
assert_queries(@total + 1) do
Post.find_each(batch_size: 1) do |post|
assert_kind_of Post, post
end
end
end
def test_each_should_not_return_query_chain_and_execute_only_one_query
assert_queries(1) do
result = Post.find_each(batch_size: 100000) {}
assert_nil result
end
end
def test_each_should_return_an_enumerator_if_no_block_is_present
assert_queries(1) do
Post.find_each(batch_size: 100000).with_index do |post, index|
assert_kind_of Post, post
assert_kind_of Integer, index
end
end
end
def test_each_should_return_a_sized_enumerator
assert_equal 11, Post.find_each(batch_size: 1).size
assert_equal 5, Post.find_each(batch_size: 2, start: 7).size
assert_equal 11, Post.find_each(batch_size: 10_000).size
end
def test_each_enumerator_should_execute_one_query_per_batch
assert_queries(@total + 1) do
Post.find_each(batch_size: 1).with_index do |post, index|
assert_kind_of Post, post
assert_kind_of Integer, index
end
end
end
def test_each_should_raise_if_select_is_set_without_id
assert_raise(ArgumentError) do
Post.select(:title).find_each(batch_size: 1) { |post|
flunk "should not call this block"
}
end
end
def test_each_should_execute_if_id_is_in_select
assert_queries(6) do
Post.select("id, title, type").find_each(batch_size: 2) do |post|
assert_kind_of Post, post
end
end
end
test "find_each should honor limit if passed a block" do
limit = @total - 1
total = 0
Post.limit(limit).find_each do |post|
total += 1
end
assert_equal limit, total
end
test "find_each should honor limit if no block is passed" do
limit = @total - 1
total = 0
Post.limit(limit).find_each.each do |post|
total += 1
end
assert_equal limit, total
end
def test_warn_if_order_scope_is_set
assert_called(ActiveRecord::Base.logger, :warn) do
Post.order("title").find_each { |post| post }
end
end
def test_logger_not_required
previous_logger = ActiveRecord::Base.logger
ActiveRecord::Base.logger = nil
assert_nothing_raised do
Post.order("comments_count DESC").find_each { |post| post }
end
ensure
ActiveRecord::Base.logger = previous_logger
end
def test_find_in_batches_should_return_batches
assert_queries(@total + 1) do
Post.find_in_batches(batch_size: 1) do |batch|
assert_kind_of Array, batch
assert_kind_of Post, batch.first
end
end
end
def test_find_in_batches_should_start_from_the_start_option
assert_queries(@total) do
Post.find_in_batches(batch_size: 1, start: 2) do |batch|
assert_kind_of Array, batch
assert_kind_of Post, batch.first
end
end
end
def test_find_in_batches_should_end_at_the_finish_option
assert_queries(6) do
Post.find_in_batches(batch_size: 1, finish: 5) do |batch|
assert_kind_of Array, batch
assert_kind_of Post, batch.first
end
end
end
def test_find_in_batches_shouldnt_execute_query_unless_needed
assert_queries(2) do
Post.find_in_batches(batch_size: @total) { |batch| assert_kind_of Array, batch }
end
assert_queries(1) do
Post.find_in_batches(batch_size: @total + 1) { |batch| assert_kind_of Array, batch }
end
end
def test_find_in_batches_should_quote_batch_order
c = Post.connection
assert_sql(/ORDER BY #{c.quote_table_name('posts')}\.#{c.quote_column_name('id')}/) do
Post.find_in_batches(batch_size: 1) do |batch|
assert_kind_of Array, batch
assert_kind_of Post, batch.first
end
end
end
def test_find_in_batches_should_not_use_records_after_yielding_them_in_case_original_array_is_modified
not_a_post = "not a post".dup
def not_a_post.id; end
not_a_post.stub(:id, -> { raise StandardError.new("not_a_post had #id called on it") }) do
assert_nothing_raised do
Post.find_in_batches(batch_size: 1) do |batch|
assert_kind_of Array, batch
assert_kind_of Post, batch.first
batch.map! { not_a_post }
end
end
end
end
def test_find_in_batches_should_ignore_the_order_default_scope
# First post is with title scope
first_post = PostWithDefaultScope.first
posts = []
PostWithDefaultScope.find_in_batches do |batch|
posts.concat(batch)
end
# posts.first will be ordered using id only. Title order scope should not apply here
assert_not_equal first_post, posts.first
assert_equal posts(:welcome).id, posts.first.id
end
def test_find_in_batches_should_error_on_ignore_the_order
assert_raise(ArgumentError) do
PostWithDefaultScope.find_in_batches(error_on_ignore: true) {}
end
end
def test_find_in_batches_should_not_error_if_config_overridden
# Set the config option which will be overridden
prev = ActiveRecord::Base.error_on_ignored_order
ActiveRecord::Base.error_on_ignored_order = true
assert_nothing_raised do
PostWithDefaultScope.find_in_batches(error_on_ignore: false) {}
end
ensure
# Set back to default
ActiveRecord::Base.error_on_ignored_order = prev
end
def test_find_in_batches_should_error_on_config_specified_to_error
# Set the config option
prev = ActiveRecord::Base.error_on_ignored_order
ActiveRecord::Base.error_on_ignored_order = true
assert_raise(ArgumentError) do
PostWithDefaultScope.find_in_batches() {}
end
ensure
# Set back to default
ActiveRecord::Base.error_on_ignored_order = prev
end
def test_find_in_batches_should_not_error_by_default
assert_nothing_raised do
PostWithDefaultScope.find_in_batches() {}
end
end
def test_find_in_batches_should_not_ignore_the_default_scope_if_it_is_other_then_order
special_posts_ids = SpecialPostWithDefaultScope.all.map(&:id).sort
posts = []
SpecialPostWithDefaultScope.find_in_batches do |batch|
posts.concat(batch)
end
assert_equal special_posts_ids, posts.map(&:id)
end
def test_find_in_batches_should_not_modify_passed_options
assert_nothing_raised do
Post.find_in_batches({ batch_size: 42, start: 1 }.freeze) {}
end
end
def test_find_in_batches_should_use_any_column_as_primary_key
nick_order_subscribers = Subscriber.order("nick asc")
start_nick = nick_order_subscribers.second.nick
subscribers = []
Subscriber.find_in_batches(batch_size: 1, start: start_nick) do |batch|
subscribers.concat(batch)
end
assert_equal nick_order_subscribers[1..-1].map(&:id), subscribers.map(&:id)
end
def test_find_in_batches_should_use_any_column_as_primary_key_when_start_is_not_specified
assert_queries(Subscriber.count + 1) do
Subscriber.find_in_batches(batch_size: 1) do |batch|
assert_kind_of Array, batch
assert_kind_of Subscriber, batch.first
end
end
end
def test_find_in_batches_should_return_an_enumerator
enum = nil
assert_no_queries do
enum = Post.find_in_batches(batch_size: 1)
end
assert_queries(4) do
enum.first(4) do |batch|
assert_kind_of Array, batch
assert_kind_of Post, batch.first
end
end
end
test "find_in_batches should honor limit if passed a block" do
limit = @total - 1
total = 0
Post.limit(limit).find_in_batches do |batch|
total += batch.size
end
assert_equal limit, total
end
test "find_in_batches should honor limit if no block is passed" do
limit = @total - 1
total = 0
Post.limit(limit).find_in_batches.each do |batch|
total += batch.size
end
assert_equal limit, total
end
def test_in_batches_should_not_execute_any_query
assert_no_queries do
assert_kind_of ActiveRecord::Batches::BatchEnumerator, Post.in_batches(of: 2)
end
end
def test_in_batches_should_yield_relation_if_block_given
assert_queries(6) do
Post.in_batches(of: 2) do |relation|
assert_kind_of ActiveRecord::Relation, relation
end
end
end
def test_in_batches_should_be_enumerable_if_no_block_given
assert_queries(6) do
Post.in_batches(of: 2).each do |relation|
assert_kind_of ActiveRecord::Relation, relation
end
end
end
def test_in_batches_each_record_should_yield_record_if_block_is_given
assert_queries(6) do
Post.in_batches(of: 2).each_record do |post|
assert_predicate post.title, :present?
assert_kind_of Post, post
end
end
end
def test_in_batches_each_record_should_return_enumerator_if_no_block_given
assert_queries(6) do
Post.in_batches(of: 2).each_record.with_index do |post, i|
assert_predicate post.title, :present?
assert_kind_of Post, post
end
end
end
def test_in_batches_each_record_should_be_ordered_by_id
ids = Post.order("id ASC").pluck(:id)
assert_queries(6) do
Post.in_batches(of: 2).each_record.with_index do |post, i|
assert_equal ids[i], post.id
end
end
end
def test_in_batches_update_all_affect_all_records
assert_queries(6 + 6) do # 6 selects, 6 updates
Post.in_batches(of: 2).update_all(title: "updated-title")
end
assert_equal Post.all.pluck(:title), ["updated-title"] * Post.count
end
def test_in_batches_delete_all_should_not_delete_records_in_other_batches
not_deleted_count = Post.where("id <= 2").count
Post.where("id > 2").in_batches(of: 2).delete_all
assert_equal 0, Post.where("id > 2").count
assert_equal not_deleted_count, Post.count
end
def test_in_batches_should_not_be_loaded
Post.in_batches(of: 1) do |relation|
assert_not_predicate relation, :loaded?
end
Post.in_batches(of: 1, load: false) do |relation|
assert_not_predicate relation, :loaded?
end
end
def test_in_batches_should_be_loaded
Post.in_batches(of: 1, load: true) do |relation|
assert_predicate relation, :loaded?
end
end
def test_in_batches_if_not_loaded_executes_more_queries
assert_queries(@total + 1) do
Post.in_batches(of: 1, load: false) do |relation|
assert_not_predicate relation, :loaded?
end
end
end
def test_in_batches_should_return_relations
assert_queries(@total + 1) do
Post.in_batches(of: 1) do |relation|
assert_kind_of ActiveRecord::Relation, relation
end
end
end
def test_in_batches_should_start_from_the_start_option
post = Post.order("id ASC").where("id >= ?", 2).first
assert_queries(2) do
relation = Post.in_batches(of: 1, start: 2).first
assert_equal post, relation.first
end
end
def test_in_batches_should_end_at_the_finish_option
post = Post.order("id DESC").where("id <= ?", 5).first
assert_queries(7) do
relation = Post.in_batches(of: 1, finish: 5, load: true).reverse_each.first
assert_equal post, relation.last
end
end
def test_in_batches_shouldnt_execute_query_unless_needed
assert_queries(2) do
Post.in_batches(of: @total) { |relation| assert_kind_of ActiveRecord::Relation, relation }
end
assert_queries(1) do
Post.in_batches(of: @total + 1) { |relation| assert_kind_of ActiveRecord::Relation, relation }
end
end
def test_in_batches_should_quote_batch_order
c = Post.connection
assert_sql(/ORDER BY #{c.quote_table_name('posts')}\.#{c.quote_column_name('id')}/) do
Post.in_batches(of: 1) do |relation|
assert_kind_of ActiveRecord::Relation, relation
assert_kind_of Post, relation.first
end
end
end
def test_in_batches_should_not_use_records_after_yielding_them_in_case_original_array_is_modified
not_a_post = "not a post".dup
def not_a_post.id
raise StandardError.new("not_a_post had #id called on it")
end
assert_nothing_raised do
Post.in_batches(of: 1) do |relation|
assert_kind_of ActiveRecord::Relation, relation
assert_kind_of Post, relation.first
relation = [not_a_post] * relation.count
end
end
end
def test_in_batches_should_not_ignore_default_scope_without_order_statements
special_posts_ids = SpecialPostWithDefaultScope.all.map(&:id).sort
posts = []
SpecialPostWithDefaultScope.in_batches do |relation|
posts.concat(relation)
end
assert_equal special_posts_ids, posts.map(&:id)
end
def test_in_batches_should_not_modify_passed_options
assert_nothing_raised do
Post.in_batches({ of: 42, start: 1 }.freeze) {}
end
end
def test_in_batches_should_use_any_column_as_primary_key
nick_order_subscribers = Subscriber.order("nick asc")
start_nick = nick_order_subscribers.second.nick
subscribers = []
Subscriber.in_batches(of: 1, start: start_nick) do |relation|
subscribers.concat(relation)
end
assert_equal nick_order_subscribers[1..-1].map(&:id), subscribers.map(&:id)
end
def test_in_batches_should_use_any_column_as_primary_key_when_start_is_not_specified
assert_queries(Subscriber.count + 1) do
Subscriber.in_batches(of: 1, load: true) do |relation|
assert_kind_of ActiveRecord::Relation, relation
assert_kind_of Subscriber, relation.first
end
end
end
def test_in_batches_should_return_an_enumerator
enum = nil
assert_no_queries do
enum = Post.in_batches(of: 1)
end
assert_queries(4) do
enum.first(4) do |relation|
assert_kind_of ActiveRecord::Relation, relation
assert_kind_of Post, relation.first
end
end
end
def test_in_batches_relations_should_not_overlap_with_each_other
seen_posts = []
Post.in_batches(of: 2, load: true) do |relation|
relation.to_a.each do |post|
assert_not seen_posts.include?(post)
seen_posts << post
end
end
end
def test_in_batches_relations_with_condition_should_not_overlap_with_each_other
seen_posts = []
author_id = Post.first.author_id
posts_by_author = Post.where(author_id: author_id)
Post.in_batches(of: 2) do |batch|
seen_posts += batch.where(author_id: author_id)
end
assert_equal posts_by_author.pluck(:id).sort, seen_posts.map(&:id).sort
end
def test_in_batches_relations_update_all_should_not_affect_matching_records_in_other_batches
Post.update_all(author_id: 0)
person = Post.last
person.update(author_id: 1)
Post.in_batches(of: 2) do |batch|
batch.where("author_id >= 1").update_all("author_id = author_id + 1")
end
assert_equal 2, person.reload.author_id # incremented only once
end
def test_find_in_batches_should_return_a_sized_enumerator
assert_equal 11, Post.find_in_batches(batch_size: 1).size
assert_equal 6, Post.find_in_batches(batch_size: 2).size
assert_equal 4, Post.find_in_batches(batch_size: 2, start: 4).size
assert_equal 4, Post.find_in_batches(batch_size: 3).size
assert_equal 1, Post.find_in_batches(batch_size: 10_000).size
end
[true, false].each do |load|
test "in_batches should return limit records when limit is less than batch size and load is #{load}" do
limit = 3
batch_size = 5
total = 0
Post.limit(limit).in_batches(of: batch_size, load: load) do |batch|
total += batch.count
end
assert_equal limit, total
end
test "in_batches should return limit records when limit is greater than batch size and load is #{load}" do
limit = 5
batch_size = 3
total = 0
Post.limit(limit).in_batches(of: batch_size, load: load) do |batch|
total += batch.count
end
assert_equal limit, total
end
test "in_batches should return limit records when limit is a multiple of the batch size and load is #{load}" do
limit = 6
batch_size = 3
total = 0
Post.limit(limit).in_batches(of: batch_size, load: load) do |batch|
total += batch.count
end
assert_equal limit, total
end
test "in_batches should return no records if the limit is 0 and load is #{load}" do
limit = 0
batch_size = 1
total = 0
Post.limit(limit).in_batches(of: batch_size, load: load) do |batch|
total += batch.count
end
assert_equal limit, total
end
test "in_batches should return all if the limit is greater than the number of records when load is #{load}" do
limit = @total + 1
batch_size = 1
total = 0
Post.limit(limit).in_batches(of: batch_size, load: load) do |batch|
total += batch.count
end
assert_equal @total, total
end
end
test ".find_each respects table alias" do
assert_queries(1) do
table_alias = Post.arel_table.alias("omg_posts")
table_metadata = ActiveRecord::TableMetadata.new(Post, table_alias)
predicate_builder = ActiveRecord::PredicateBuilder.new(table_metadata)
posts = ActiveRecord::Relation.create(
Post,
table: table_alias,
predicate_builder: predicate_builder
)
posts.find_each {}
end
end
test ".find_each bypasses the query cache for its own queries" do
Post.cache do
assert_queries(2) do
Post.find_each {}
Post.find_each {}
end
end
end
test ".find_each does not disable the query cache inside the given block" do
Post.cache do
Post.find_each(start: 1, finish: 1) do |post|
assert_queries(1) do
post.comments.count
post.comments.count
end
end
end
end
test ".find_in_batches bypasses the query cache for its own queries" do
Post.cache do
assert_queries(2) do
Post.find_in_batches {}
Post.find_in_batches {}
end
end
end
test ".find_in_batches does not disable the query cache inside the given block" do
Post.cache do
Post.find_in_batches(start: 1, finish: 1) do |batch|
assert_queries(1) do
batch.first.comments.count
batch.first.comments.count
end
end
end
end
test ".in_batches bypasses the query cache for its own queries" do
Post.cache do
assert_queries(2) do
Post.in_batches {}
Post.in_batches {}
end
end
end
test ".in_batches does not disable the query cache inside the given block" do
Post.cache do
Post.in_batches(start: 1, finish: 1) do |relation|
assert_queries(1) do
relation.count
relation.count
end
end
end
end
end