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require File.join(File.dirname(__FILE__), '..', '..', '..', 'spec_helper')
module Arel
describe Join do
before do
@relation1 = Table.new(:users)
@relation2 = Table.new(:photos)
@predicate = @relation1[:id].eq(@relation2[:user_id])
end
describe 'hashing' do
it 'implements hash equality' do
Join.new("INNER JOIN", @relation1, @relation2, @predicate) \
.should hash_the_same_as(Join.new("INNER JOIN", @relation1, @relation2, @predicate))
end
end
describe '#engine' do
it "delegates to a relation's engine" do
Join.new("INNER JOIN", @relation1, @relation2, @predicate).engine.should == @relation1.engine
end
end
describe '#attributes' do
it 'combines the attributes of the two relations' do
join = Join.new("INNER JOIN", @relation1, @relation2, @predicate)
join.attributes.should ==
(@relation1.attributes + @relation2.attributes).collect { |a| a.bind(join) }
end
end
describe '#to_sql' do
describe 'when joining with another relation' do
it 'manufactures sql joining the two tables on the predicate' do
Join.new("INNER JOIN", @relation1, @relation2, @predicate).to_sql.should be_like("
SELECT `users`.`id`, `users`.`name`, `photos`.`id`, `photos`.`user_id`, `photos`.`camera_id`
FROM `users`
INNER JOIN `photos` ON `users`.`id` = `photos`.`user_id`
")
end
end
describe 'when joining with a string' do
it "passes the string through to the where clause" do
Join.new("INNER JOIN asdf ON fdsa", @relation1).to_sql.should be_like("
SELECT `users`.`id`, `users`.`name`
FROM `users`
INNER JOIN asdf ON fdsa
")
end
end
end
end
end
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