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require File.join(File.dirname(__FILE__), '..', '..', '..', 'spec_helper')
module Arel
describe Join do
before do
@relation1 = Table.new(:users)
@relation2 = @relation1.alias
@predicate = @relation1[:id].eq(@relation2[:id])
end
describe 'when joining a relation to itself' do
describe '#to_sql' do
it 'manufactures sql aliasing the table and attributes properly in the join predicate and the where clause' do
@relation1.join(@relation2).on(@predicate).to_sql.should be_like("
SELECT `users`.`id`, `users`.`name`, `users_2`.`id`, `users_2`.`name`
FROM `users`
INNER JOIN `users` AS `users_2`
ON `users`.`id` = `users_2`.`id`
")
end
describe 'when joining with a selection on the same relation' do
it 'manufactures sql aliasing the tables properly' do
@relation1 \
.join(@relation2.select(@relation2[:id].eq(1))) \
.on(@predicate) \
.to_sql.should be_like("
SELECT `users`.`id`, `users`.`name`, `users_2`.`id`, `users_2`.`name`
FROM `users`
INNER JOIN `users` AS `users_2`
ON `users`.`id` = `users_2`.`id` AND `users_2`.`id` = 1
")
end
describe 'when the selection occurs before the alias' do
it 'manufactures sql aliasing the predicates properly' do
relation2 = @relation1.select(@relation1[:id].eq(1)).alias
@relation1 \
.join(relation2) \
.on(relation2[:id].eq(@relation1[:id])) \
.to_sql.should be_like("
SELECT `users`.`id`, `users`.`name`, `users_2`.`id`, `users_2`.`name`
FROM `users`
INNER JOIN `users` AS `users_2`
ON `users_2`.`id` = `users`.`id` AND `users_2`.`id` = 1
")
end
end
end
describe 'when joining the relation to itself multiple times' do
before do
@relation3 = @relation1.alias
end
describe 'when joining left-associatively' do
it 'manufactures sql aliasing the tables properly' do
@relation1 \
.join(@relation2 \
.join(@relation3) \
.on(@relation2[:id].eq(@relation3[:id]))) \
.on(@relation1[:id].eq(@relation2[:id])) \
.to_sql.should be_like("
SELECT `users`.`id`, `users`.`name`, `users_2`.`id`, `users_2`.`name`, `users_3`.`id`, `users_3`.`name`
FROM `users`
INNER JOIN `users` AS `users_2`
ON `users`.`id` = `users_2`.`id`
INNER JOIN `users` AS `users_3`
ON `users_2`.`id` = `users_3`.`id`
")
end
end
describe 'when joining right-associatively' do
it 'manufactures sql aliasing the tables properly' do
@relation1 \
.join(@relation2).on(@relation1[:id].eq(@relation2[:id])) \
.join(@relation3).on(@relation2[:id].eq(@relation3[:id])) \
.to_sql.should be_like("
SELECT `users`.`id`, `users`.`name`, `users_2`.`id`, `users_2`.`name`, `users_3`.`id`, `users_3`.`name`
FROM `users`
INNER JOIN `users` AS `users_2`
ON `users`.`id` = `users_2`.`id`
INNER JOIN `users` AS `users_3`
ON `users_2`.`id` = `users_3`.`id`
")
end
end
end
end
describe '[]' do
describe 'when given an attribute belonging to both sub-relations' do
it 'disambiguates the relation that serves as the ancestor to the attribute' do
@relation1 \
.join(@relation2) \
.on(@predicate) \
.should disambiguate_attributes(@relation1[:id], @relation2[:id])
end
describe 'when the left relation is extremely compound' do
it 'disambiguates the relation that serves as the ancestor to the attribute' do
@relation1 \
.select(@predicate) \
.select(@predicate) \
.join(@relation2) \
.on(@predicate) \
.should disambiguate_attributes(@relation1[:id], @relation2[:id])
end
it '' do
r0 = @relation1.select(@predicate)
r1 = r0.alias
r = r0.join(r1).on(@predicate)
r.should disambiguate_attributes(r0[:id], r1[:id])
end
end
describe 'when the right relation is extremely compound' do
it 'disambiguates the relation that serves as the ancestor to the attribute' do
@relation1 \
.join( \
@relation2 \
.select(@predicate) \
.select(@predicate) \
.select(@predicate)) \
.on(@predicate) \
.should disambiguate_attributes(@relation1[:id], @relation2[:id])
end
end
end
end
end
end
end
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