fixing column escape for IN nodes. [resolves:5732]

2 files changed, 12 insertions, 6 deletions

diff --git a/lib/arel/visitors/dot.rb b/lib/arel/visitors/dot.rb
index a65a7f7301..3d25d5f012 100644
--- a/lib/arel/visitors/dot.rb
+++ b/lib/arel/visitors/dot.rb
@@ -28,6 +28,10 @@ module Arel
       end
 
       private
+      def visit_Arel_Nodes_Grouping o
+        visit_edge o, "expr"
+      end
+
       def visit_Arel_Nodes_TableAlias o
         visit_edge o, "name"
         visit_edge o, "relation"
@@ -104,6 +108,7 @@ module Arel
       alias :visit_Arel_Nodes_GreaterThan        :visit_Arel_Nodes_Equality
       alias :visit_Arel_Nodes_GreaterThanOrEqual :visit_Arel_Nodes_Equality
       alias :visit_Arel_Nodes_Assignment         :visit_Arel_Nodes_Equality
+      alias :visit_Arel_Nodes_In                 :visit_Arel_Nodes_Equality
 
       def visit_String o
         @node_stack.last.fields << o
diff --git a/lib/arel/visitors/to_sql.rb b/lib/arel/visitors/to_sql.rb
index 7f9186d28c..974f9f5341 100644
--- a/lib/arel/visitors/to_sql.rb
+++ b/lib/arel/visitors/to_sql.rb
@@ -7,13 +7,13 @@ module Arel
       def initialize engine
         @engine         = engine
         @connection     = nil
-        @last_column    = []
+        @last_column    = nil
         @quoted_tables  = {}
         @quoted_columns = {}
       end
 
       def accept object
-        @last_column = []
+        @last_column = nil
         @engine.connection_pool.with_connection do |conn|
           @connection = conn
           visit object
@@ -195,8 +195,9 @@ module Arel
 
       def visit_Arel_Nodes_In o
         right = o.right
-        right = right.empty? ? 'NULL' : right.map { |x| visit x }.join(', ')
-        "#{visit o.left} IN (#{right})"
+        "#{visit o.left} IN (#{
+          right.empty? ? 'NULL' : right.map { |x| visit x }.join(', ')
+        })"
       end
 
       def visit_Arel_Nodes_NotIn o
@@ -243,7 +244,7 @@ module Arel
       end
 
       def visit_Arel_Attributes_Attribute o
-        @last_column.push o.column
+        @last_column = o.column
         join_name = o.relation.table_alias || o.relation.name
         "#{quote_table_name join_name}.#{quote_column_name o.name}"
       end
@@ -257,7 +258,7 @@ module Arel
       alias :visit_Arel_Nodes_SqlLiteral :visit_Fixnum
       alias :visit_Arel_SqlLiteral :visit_Fixnum # This is deprecated
 
-      def visit_String o; quote(o, @last_column.pop) end
+      def visit_String o; quote(o, @last_column) end
 
       alias :visit_ActiveSupport_Multibyte_Chars :visit_String
       alias :visit_BigDecimal :visit_String