Refactor making join constraints

The only difference between `make_inner_joins` and
`make_left_outer_joins` is the `join_type`.

1 files changed, 6 insertions, 23 deletions

diff --git a/activerecord/lib/active_record/associations/join_dependency.rb b/activerecord/lib/active_record/associations/join_dependency.rb
index 8995b1e352..643226267c 100644
--- a/activerecord/lib/active_record/associations/join_dependency.rb
+++ b/activerecord/lib/active_record/associations/join_dependency.rb
@@ -106,12 +106,7 @@ module ActiveRecord
 
       def join_constraints(outer_joins, join_type)
         joins = join_root.children.flat_map { |child|
-
-          if join_type == Arel::Nodes::OuterJoin
-            make_left_outer_joins join_root, child
-          else
-            make_inner_joins join_root, child
-          end
+          make_join_constraints(join_root, child, join_type)
         }
 
         joins.concat outer_joins.flat_map { |oj|
@@ -175,27 +170,15 @@ module ActiveRecord
         end
 
         def make_outer_joins(parent, child)
-          tables    = table_aliases_for(parent, child)
-          join_type = Arel::Nodes::OuterJoin
-          info      = make_constraints parent, child, tables, join_type
-
-          [info] + child.children.flat_map { |c| make_outer_joins(child, c) }
-        end
-
-        def make_left_outer_joins(parent, child)
-          tables    = child.tables
           join_type = Arel::Nodes::OuterJoin
-          info      = make_constraints parent, child, tables, join_type
-
-          [info] + child.children.flat_map { |c| make_left_outer_joins(child, c) }
+          make_join_constraints(parent, child, join_type, true)
         end
 
-        def make_inner_joins(parent, child)
-          tables    = child.tables
-          join_type = Arel::Nodes::InnerJoin
-          info      = make_constraints parent, child, tables, join_type
+        def make_join_constraints(parent, child, join_type, aliasing = false)
+          tables = aliasing ? table_aliases_for(parent, child) : child.tables
+          info   = make_constraints(parent, child, tables, join_type)
 
-          [info] + child.children.flat_map { |c| make_inner_joins(child, c) }
+          [info] + child.children.flat_map { |c| make_join_constraints(child, c, join_type, aliasing) }
         end
 
         def table_aliases_for(parent, node)