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require 'cases/helper'
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_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(RuntimeError) do
Post.select(:title).find_each(:batch_size => 1) { |post| post }
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
def test_warn_if_limit_scope_is_set
ActiveRecord::Base.logger.expects(:warn)
Post.limit(1).find_each { |post| post }
end
def test_warn_if_order_scope_is_set
ActiveRecord::Base.logger.expects(:warn)
Post.order("title").find_each { |post| post }
end
def test_logger_not_required
previous_logger = ActiveRecord::Base.logger
ActiveRecord::Base.logger = nil
assert_nothing_raised do
Post.limit(1).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_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"
not_a_post.stubs(:id).raises(StandardError, "not_a_post had #id called on it")
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
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), posts.first
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_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_each(:batch_size => 1) do |subscriber|
assert_kind_of Subscriber, subscriber
end
end
end
end
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