additional testing

1 files changed, 78 insertions, 28 deletions

diff --git a/spec/arel/unit/relations/join_spec.rb b/spec/arel/unit/relations/join_spec.rb
index 52e1a93b8e..9cd7a13ed7 100644
--- a/spec/arel/unit/relations/join_spec.rb
+++ b/spec/arel/unit/relations/join_spec.rb
@@ -107,14 +107,28 @@ module Arel
           end
         end
 
-        # TESTME try other direction too!
-        it "keeps selects on the aggregation within the derived table" do
-          Join.new("INNER JOIN", @relation1, @aggregation.select(@aggregation[:user_id].eq(1)), @predicate).to_sql.should be_like("
-            SELECT `users`.`id`, `users`.`name`, `photos_aggregation`.`user_id`, `photos_aggregation`.`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_aggregation`
-                ON `users`.`id` = `photos_aggregation`.`user_id`
-          ")
+        describe 'when the aggration has a selection' do
+          describe 'with the aggregation on the left' do
+            it "manufactures sql keeping selects on the aggregation within the derived table" do
+              Join.new("INNER JOIN", @relation1, @aggregation.select(@aggregation[:user_id].eq(1)), @predicate).to_sql.should be_like("
+                SELECT `users`.`id`, `users`.`name`, `photos_aggregation`.`user_id`, `photos_aggregation`.`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_aggregation`
+                    ON `users`.`id` = `photos_aggregation`.`user_id`
+              ")
+            end
+          end
+          
+          describe 'with the aggregation on the right' do
+            it "manufactures sql keeping selects on the aggregation within the derived table" do
+              Join.new("INNER JOIN", @aggregation.select(@aggregation[:user_id].eq(1)), @relation1, @predicate).to_sql.should be_like("
+                SELECT `photos_aggregation`.`user_id`, `photos_aggregation`.`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_aggregation`
+                  INNER JOIN `users`
+                    ON `users`.`id` = `photos_aggregation`.`user_id`
+              ")
+            end
+          end
         end
       end
     end
@@ -127,38 +141,74 @@ module Arel
       
       describe 'when joining the same relation to itself' do
         describe '#to_sql' do
-          it '' do
-            relation2 = @relation1.alias
-            relation3 = @relation1.alias
-            @relation1 \
-              .join(relation2.join(relation3).on(relation2[:id].eq(relation3[:id]))) \
-                .on(@relation1[:id].eq(relation2[:id])) \
-              .select(@relation1[:id].eq(1)) \
-            .to_sql.should be_like("
-              SELECT `users`.`id`, `users`.`name`, `users_2`.`id`, `users_2`.`name`, `users_3`.`id`, `users_3`.`name`
+          it 'manufactures sql aliasing the table and attributes properly in the join predicate and the where clause' do
+            @relation1.join(@aliased_relation).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`
-                INNER JOIN `users` AS `users_3`
-                  ON `users_2`.`id` = `users_3`.`id`
-              WHERE `users`.`id` = 1
             ")
           end
           
-          it 'aliases the table and attributes properly in the join predicate and the where clause' do
-            @relation1.join(@aliased_relation).on(@relation1[:id].eq(@aliased_relation[: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`.`id` = `users_2`.`id`
-            ")
+          describe 'when joining with a selection on the same relation' do
+            it 'manufactures sql aliasing the tables properly' do
+              @relation1                                                      \
+                .join(@aliased_relation.select(@aliased_relation[: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`
+                WHERE `users_2`.`id` = 1
+              ")
+            end
+          end
+          
+          describe 'when joining the same relation to itself multiple times' do
+            before do
+              @relation2 = @relation1.alias
+              @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
-              relation = @relation1.join(@aliased_relation).on(@relation1[:id].eq(@aliased_relation[:id]))
+              relation = @relation1.join(@aliased_relation).on(@predicate)
               relation[@relation1[:id]].ancestor.should == @relation1[:id]
               relation[@aliased_relation[:id]].ancestor.should == @aliased_relation[:id]
             end