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require File.join(File.dirname(__FILE__), '..', '..', '..', 'spec_helper')
module Arel
describe Join do
before do
@relation1 = Arel(:users)
@relation2 = Arel(:photos)
@predicate = @relation1[:id].eq(@relation2[:user_id])
end
describe 'when joining aggregated relations' do
before do
@aggregation = @relation2 \
.group(@relation2[:user_id]) \
.project(@relation2[:user_id], @relation2[:id].count.as(:cnt)) \
end
describe '#to_sql' do
# CLEANUP
it '' do
@relation1.join(@relation2.take(3)).on(@predicate).to_sql.should be_like("
SELECT `users`.`id`, `users`.`name`, `photos_external`.`id`, `photos_external`.`user_id`, `photos_external`.`camera_id`
FROM `users`
INNER JOIN (SELECT `photos`.`id`, `photos`.`user_id`, `photos`.`camera_id` FROM `photos` LIMIT 3) AS `photos_external`
ON `users`.`id` = `photos_external`.`user_id`
")
end
describe 'with the aggregation on the right' do
it 'manufactures sql joining the left table to a derived table' do
@relation1.join(@aggregation).on(@predicate).to_sql.should be_like("
SELECT `users`.`id`, `users`.`name`, `photos_external`.`user_id`, `photos_external`.`cnt`
FROM `users`
INNER JOIN (SELECT `photos`.`user_id`, COUNT(`photos`.`id`) AS `cnt` FROM `photos` GROUP BY `photos`.`user_id`) AS `photos_external`
ON `users`.`id` = `photos_external`.`user_id`
")
end
end
describe 'with the aggregation on the left' do
it 'manufactures sql joining the right table to a derived table' do
@aggregation.join(@relation1).on(@predicate).to_sql.should be_like("
SELECT `photos_external`.`user_id`, `photos_external`.`cnt`, `users`.`id`, `users`.`name`
FROM (SELECT `photos`.`user_id`, COUNT(`photos`.`id`) AS `cnt` FROM `photos` GROUP BY `photos`.`user_id`) AS `photos_external`
INNER JOIN `users`
ON `users`.`id` = `photos_external`.`user_id`
")
end
end
describe 'with the aggregation on both sides' do
it 'it properly aliases the aggregations' do
aggregation2 = @aggregation.alias
@aggregation.join(aggregation2).on(aggregation2[:user_id].eq(@aggregation[:user_id])).to_sql.should be_like("
SELECT `photos_external`.`user_id`, `photos_external`.`cnt`, `photos_external_2`.`user_id`, `photos_external_2`.`cnt`
FROM (SELECT `photos`.`user_id`, COUNT(`photos`.`id`) AS `cnt` FROM `photos` GROUP BY `photos`.`user_id`) AS `photos_external`
INNER JOIN (SELECT `photos`.`user_id`, COUNT(`photos`.`id`) AS `cnt` FROM `photos` GROUP BY `photos`.`user_id`) AS `photos_external_2`
ON `photos_external_2`.`user_id` = `photos_external`.`user_id`
")
end
end
describe 'when the aggration has a where' do
describe 'with the aggregation on the left' do
it "manufactures sql keeping wheres on the aggregation within the derived table" do
@relation1.join(@aggregation.where(@aggregation[:user_id].eq(1))).on(@predicate).to_sql.should be_like("
SELECT `users`.`id`, `users`.`name`, `photos_external`.`user_id`, `photos_external`.`cnt`
FROM `users`
INNER JOIN (SELECT `photos`.`user_id`, COUNT(`photos`.`id`) AS `cnt` FROM `photos` WHERE `photos`.`user_id` = 1 GROUP BY `photos`.`user_id`) AS `photos_external`
ON `users`.`id` = `photos_external`.`user_id`
")
end
end
describe 'with the aggregation on the right' do
it "manufactures sql keeping wheres on the aggregation within the derived table" do
@aggregation.where(@aggregation[:user_id].eq(1)).join(@relation1).on(@predicate).to_sql.should be_like("
SELECT `photos_external`.`user_id`, `photos_external`.`cnt`, `users`.`id`, `users`.`name`
FROM (SELECT `photos`.`user_id`, COUNT(`photos`.`id`) AS `cnt` FROM `photos` WHERE `photos`.`user_id` = 1 GROUP BY `photos`.`user_id`) AS `photos_external`
INNER JOIN `users`
ON `users`.`id` = `photos_external`.`user_id`
")
end
end
end
end
end
end
end
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