PERF: eliminating method_missing

5 files changed, 12 insertions, 20 deletions

diff --git a/lib/arel/engines/sql/compilers/oracle_compiler.rb b/lib/arel/engines/sql/compilers/oracle_compiler.rb
index 66a91cecb5..1963454d36 100644
--- a/lib/arel/engines/sql/compilers/oracle_compiler.rb
+++ b/lib/arel/engines/sql/compilers/oracle_compiler.rb
@@ -16,7 +16,7 @@ module Arel
         # when limit or offset subquery is used then cannot use FOR UPDATE directly
         # and need to construct separate subquery for primary key
         if use_subquery_for_lock = limit_or_offset && !locked.blank?
-          quoted_primary_key = engine.quote_column_name(primary_key)
+          quoted_primary_key = engine.connection.quote_column_name(primary_key)
         end
         select_attributes_string = use_subquery_for_lock ? quoted_primary_key : select_clauses.join(', ')
 
@@ -39,7 +39,7 @@ module Arel
           ("ORDER BY  #{order_clauses_array.join(', ')}" unless order_clauses_array.blank? )
 
         # Use existing method from oracle_enhanced adapter to implement limit and offset using subqueries
-        engine.add_limit_offset!(query, :limit => taken, :offset => skipped) if limit_or_offset
+        engine.connection.add_limit_offset!(query, :limit => taken, :offset => skipped) if limit_or_offset
 
         if use_subquery_for_lock
           build_query \
@@ -83,10 +83,10 @@ module Arel
       def limited_update_conditions(conditions, taken)
         # need to add ORDER BY only if just taken ones should be updated
         conditions << " ORDER BY #{order_clauses.join(', ')}" unless orders.blank?
-        quoted_primary_key = engine.quote_column_name(primary_key)
-        subquery = "SELECT #{quoted_primary_key} FROM #{engine.connection.quote_table_name table.name} #{conditions}"
+        quoted_primary_key = engine.connection.quote_column_name(primary_key)
+        subquery = "SELECT #{quoted_primary_key} FROM #{engine.connection.connection.quote_table_name table.name} #{conditions}"
         # Use existing method from oracle_enhanced adapter to get taken records when ORDER BY is used
-        engine.add_limit_offset!(subquery, :limit => taken) unless orders.blank?
+        engine.connection.add_limit_offset!(subquery, :limit => taken) unless orders.blank?
         "WHERE #{quoted_primary_key} IN (#{subquery})"
       end
 
diff --git a/lib/arel/engines/sql/compilers/postgresql_compiler.rb b/lib/arel/engines/sql/compilers/postgresql_compiler.rb
index 1f6e74d57a..3f814255e9 100644
--- a/lib/arel/engines/sql/compilers/postgresql_compiler.rb
+++ b/lib/arel/engines/sql/compilers/postgresql_compiler.rb
@@ -35,7 +35,7 @@ module Arel
       end
 
       def supports_insert_with_returning?
-        engine.postgresql_version >= 80200
+        engine.connection.send(:postgresql_version) >= 80200
       end
     end
   end
diff --git a/lib/arel/engines/sql/engine.rb b/lib/arel/engines/sql/engine.rb
index 8504fec3c5..7e841d68bb 100644
--- a/lib/arel/engines/sql/engine.rb
+++ b/lib/arel/engines/sql/engine.rb
@@ -19,14 +19,6 @@ module Arel
         end
       end
 
-      def method_missing(method, *args)
-        if block_given?
-          connection.send(method, *args)  { |*block_args| yield(*block_args) }
-        else
-          connection.send(method, *args)
-        end
-      end
-
       def create(relation)
         primary_key_value = if relation.primary_key.blank?
           nil
diff --git a/lib/arel/engines/sql/relations/compiler.rb b/lib/arel/engines/sql/relations/compiler.rb
index 2941fc2a06..9691c8518c 100644
--- a/lib/arel/engines/sql/relations/compiler.rb
+++ b/lib/arel/engines/sql/relations/compiler.rb
@@ -68,7 +68,7 @@ module Arel
           end
 
           first = attributes.collect do |key|
-            engine.quote_column_name(key.name)
+            engine.connection.quote_column_name(key.name)
           end.join(', ')
 
           second = attributes.collect do |key|
@@ -82,7 +82,7 @@ module Arel
           "INSERT",
           "INTO #{table_sql}",
           insertion_attributes_values_sql,
-          ("RETURNING #{engine.quote_column_name(primary_key)}" if include_returning && compiler.supports_insert_with_returning?)
+          ("RETURNING #{engine.connection.quote_column_name(primary_key)}" if include_returning && compiler.supports_insert_with_returning?)
       end
 
       def supports_insert_with_returning?
@@ -117,7 +117,7 @@ module Arel
 
           attributes.map do |attribute|
             value = assignments[attribute]
-            "#{engine.quote_column_name(attribute.name)} = #{attribute.format(value)}"
+            "#{engine.connection.quote_column_name(attribute.name)} = #{attribute.format(value)}"
           end.join(", ")
         else
           assignments.value
@@ -138,7 +138,7 @@ module Arel
 
       def limited_update_conditions(conditions, taken)
         conditions << " LIMIT #{taken}"
-        quoted_primary_key = engine.quote_column_name(primary_key)
+        quoted_primary_key = engine.connection.quote_column_name(primary_key)
         "WHERE #{quoted_primary_key} IN (SELECT #{quoted_primary_key} FROM #{engine.connection.quote_table_name table.name} #{conditions})"
       end
 
diff --git a/lib/arel/engines/sql/relations/table.rb b/lib/arel/engines/sql/relations/table.rb
index 94843ec62d..236a36c7a7 100644
--- a/lib/arel/engines/sql/relations/table.rb
+++ b/lib/arel/engines/sql/relations/table.rb
@@ -42,7 +42,7 @@ module Arel
           end
         end
 
-        @@tables ||= engine.tables
+        @@tables ||= engine.connection.tables
       end
     end
 
@@ -85,7 +85,7 @@ module Arel
     end
 
     def columns
-      @columns ||= engine.columns(name, "#{name} Columns")
+      @columns ||= engine.connection.columns(name, "#{name} Columns")
     end
 
     def reset