Extract a Relation#arel_attribute

activerecord/lib/active_record/core.rb

@@ -256,7 +256,7 @@ module ActiveRecord
           end
       end
 
-      def arel_attribute(name, table) # :nodoc:
+      def arel_attribute(name, table = arel_table) # :nodoc:
         name = attribute_alias(name) if attribute_alias?(name)
         table[name]
       end

activerecord/lib/active_record/relation.rb

@@ -47,7 +47,7 @@ module ActiveRecord
 
         if !primary_key_value && connection.prefetch_primary_key?(klass.table_name)
           primary_key_value = connection.next_sequence_value(klass.sequence_name)
-          values[klass.arel_attribute(klass.primary_key, table)] = primary_key_value
+          values[arel_attribute(klass.primary_key)] = primary_key_value
         end
       end
 
@@ -105,6 +105,10 @@ module ActiveRecord
       [substitutes, binds]
     end
 
+    def arel_attribute(name) # :nodoc:
+      klass.arel_attribute(name, table)
+    end
+
     # Initializes new record from relation while maintaining the current
     # scope.
     #
@@ -373,9 +377,9 @@ module ActiveRecord
       stmt.table(table)
 
       if joins_values.any?
-        @klass.connection.join_to_update(stmt, arel, @klass.arel_attribute(primary_key, table))
+        @klass.connection.join_to_update(stmt, arel, arel_attribute(primary_key))
       else
-        stmt.key = @klass.arel_attribute(primary_key, table)
+        stmt.key = arel_attribute(primary_key)
         stmt.take(arel.limit)
         stmt.order(*arel.orders)
         stmt.wheres = arel.constraints
@@ -527,7 +531,7 @@ module ActiveRecord
         stmt.from(table)
 
         if joins_values.any?
-          @klass.connection.join_to_delete(stmt, arel, @klass.arel_attribute(primary_key, table))
+          @klass.connection.join_to_delete(stmt, arel, arel_attribute(primary_key))
         else
           stmt.wheres = arel.constraints
         end

activerecord/lib/active_record/relation/batches.rb

@@ -204,15 +204,15 @@ module ActiveRecord
         yield yielded_relation
 
         break if ids.length < of
-        batch_relation = relation.where(klass.arel_attribute(primary_key, table).gt(primary_key_offset))
+        batch_relation = relation.where(arel_attribute(primary_key).gt(primary_key_offset))
       end
     end
 
     private
 
     def apply_limits(relation, start, finish)
-      relation = relation.where(klass.arel_attribute(primary_key, table).gteq(start)) if start
-      relation = relation.where(klass.arel_attribute(primary_key, table).lteq(finish)) if finish
+      relation = relation.where(arel_attribute(primary_key).gteq(start)) if start
+      relation = relation.where(arel_attribute(primary_key).lteq(finish)) if finish
       relation
     end
 

activerecord/lib/active_record/relation/calculations.rb

@@ -164,7 +164,7 @@ module ActiveRecord
       else
         relation = spawn
         relation.select_values = column_names.map { |cn|
-          @klass.has_attribute?(cn) || @klass.attribute_alias?(cn) ? klass.arel_attribute(cn, table) : cn
+          @klass.has_attribute?(cn) || @klass.attribute_alias?(cn) ? arel_attribute(cn) : cn
         }
         result = klass.connection.select_all(relation.arel, nil, bound_attributes)
         result.cast_values(klass.attribute_types)

activerecord/lib/active_record/relation/finder_methods.rb

@@ -147,7 +147,7 @@ module ActiveRecord
     def last(limit = nil)
       if limit
         if order_values.empty? && primary_key
-          order(klass.arel_attribute(primary_key, table).desc).limit(limit).reverse
+          order(arel_attribute(primary_key).desc).limit(limit).reverse
         else
           to_a.last(limit)
         end
@@ -514,7 +514,7 @@ module ActiveRecord
       # TODO: once the offset argument is removed from find_nth,
       # find_nth_with_limit_and_offset can be merged into this method
       relation = if order_values.empty? && primary_key
-                   order(klass.arel_attribute(primary_key, table).asc)
+                   order(arel_attribute(primary_key).asc)
                  else
                    self
                  end

activerecord/lib/active_record/relation/predicate_builder/relation_handler.rb

@@ -3,7 +3,7 @@ module ActiveRecord
     class RelationHandler # :nodoc:
       def call(attribute, value)
         if value.select_values.empty?
-          value = value.select(value.klass.arel_attribute(value.klass.primary_key, value.klass.arel_table))
+          value = value.select(value.arel_attribute(value.klass.primary_key))
         end
 
         attribute.in(value.arel)

activerecord/lib/active_record/relation/query_methods.rb

@@ -1094,7 +1094,7 @@ module ActiveRecord
     def arel_columns(columns)
       columns.map do |field|
         if (Symbol === field || String === field) && (klass.has_attribute?(field) || klass.attribute_alias?(field)) && !from_clause.value
-          klass.arel_attribute(field, table)
+          arel_attribute(field)
         elsif Symbol === field
           connection.quote_table_name(field.to_s)
         else
@@ -1105,7 +1105,7 @@ module ActiveRecord
 
     def reverse_sql_order(order_query)
       if order_query.empty?
-        return [klass.arel_attribute(primary_key, table).desc] if primary_key
+        return [arel_attribute(primary_key).desc] if primary_key
         raise IrreversibleOrderError,
           "Relation has no current order and table has no primary key to be used as default order"
       end
@@ -1170,10 +1170,10 @@ module ActiveRecord
       order_args.map! do |arg|
         case arg
         when Symbol
-          klass.arel_attribute(arg, table).asc
+          arel_attribute(arg).asc
         when Hash
           arg.map { |field, dir|
-            klass.arel_attribute(field, table).send(dir.downcase)
+            arel_attribute(field).send(dir.downcase)
           }
         else
           arg