Index: test/schema/frontbase.drop.sql
===================================================================
--- test/schema/frontbase.drop.sql	(revision 9248)
+++ test/schema/frontbase.drop.sql	(working copy)
@@ -31,3 +31,4 @@
 DROP TABLE numeric_data CASCADE;
 DROP TABLE mixed_case_monkeys CASCADE;
 DROP TABLE minimalistics CASCADE;
+DROP TABLE nonnum_id_col_nopk CASCADE;
Index: test/schema/sybase.drop.sql
===================================================================
--- test/schema/sybase.drop.sql	(revision 9248)
+++ test/schema/sybase.drop.sql	(working copy)
@@ -32,4 +32,5 @@
 DROP TABLE mixed_case_monkeys
 DROP TABLE minimalistics
 DROP TABLE schema_migrations
+DROP TABLE nonnum_id_col_nopk;
 go
Index: test/schema/firebird.drop.sql
===================================================================
--- test/schema/firebird.drop.sql	(revision 9248)
+++ test/schema/firebird.drop.sql	(working copy)
@@ -32,6 +32,7 @@
 DROP TABLE numeric_data;
 DROP TABLE mixed_case_monkeys;
 DROP TABLE minimalistics;
+DROP TABLE nonnum_id_col_nopk;
 
 DROP DOMAIN D_BOOLEAN;
 
Index: test/schema/sqlite.drop.sql
===================================================================
--- test/schema/sqlite.drop.sql	(revision 9248)
+++ test/schema/sqlite.drop.sql	(working copy)
@@ -31,3 +31,4 @@
 DROP TABLE numeric_data;
 DROP TABLE mixed_case_monkeys;
 DROP TABLE minimalistics;
+DROP TABLE nonnum_id_col_nopk;
Index: test/schema/schema.rb
===================================================================
--- test/schema/schema.rb	(revision 9248)
+++ test/schema/schema.rb	(working copy)
@@ -424,4 +424,9 @@
     t.integer :sponsorable_id
     t.string :sponsorable_type
   end
+  
+  create_table :nonnum_id_col_nopk, :id => false do |t|
+    t.text :id, :null => false
+    t.text :description, :null => false
+  end
 end
Index: test/schema/oracle.drop.sql
===================================================================
--- test/schema/oracle.drop.sql	(revision 9248)
+++ test/schema/oracle.drop.sql	(working copy)
@@ -32,6 +32,7 @@
 drop table numeric_data;
 drop table mixed_case_monkeys;
 drop table minimalistics;
+drop table nonnum_id_col_nopk;
 
 drop sequence accounts_seq;
 drop sequence funny_jokes_seq;
Index: test/schema/db2.drop.sql
===================================================================
--- test/schema/db2.drop.sql	(revision 9248)
+++ test/schema/db2.drop.sql	(working copy)
@@ -31,3 +31,4 @@
 DROP TABLE numeric_data;
 DROP TABLE mixed_case_monkeys;
 DROP TABLE minimalistics;
+DROP TABLE nonnum_id_col_nopk;
Index: test/schema/postgresql.drop.sql
===================================================================
--- test/schema/postgresql.drop.sql	(revision 9248)
+++ test/schema/postgresql.drop.sql	(working copy)
@@ -35,6 +35,7 @@
 DROP TABLE numeric_data;
 DROP TABLE column_data;
 DROP TABLE mixed_case_monkeys;
+DROP TABLE nonnum_id_col_nopk;
 DROP TABLE postgresql_arrays;
 DROP TABLE postgresql_moneys;
 DROP TABLE postgresql_numbers;
Index: test/cases/schema_dumper_test.rb
===================================================================
--- test/cases/schema_dumper_test.rb	(revision 9248)
+++ test/cases/schema_dumper_test.rb	(working copy)
@@ -102,7 +102,15 @@
         ActiveRecord::SchemaDumper.dump(ActiveRecord::Base.connection, stream)
       end
     end
-
+    
+    def test_schema_dump_preserves_nonnumeric_column_named_id_on_table_with_no_pk
+      output = standard_dump
+      match = output.match(%r{create_table "nonnum_id_col_nopk"(.*)do})
+      assert_not_nil(match, "table with non-numeric id column and no primary key not found")
+      assert_match %r(:id => false), match[1], "explicit primary key disable not preserved"
+      assert_match %r{t.text\s+"id",\s+:null => false}, output, "non-numeric id column not preserved"
+    end
+    
     if current_adapter?(:MysqlAdapter)
       def test_schema_dump_should_not_add_default_value_for_mysql_text_field
         output = standard_dump
Index: lib/active_record/schema_dumper.rb
===================================================================
--- lib/active_record/schema_dumper.rb	(revision 9248)
+++ lib/active_record/schema_dumper.rb	(working copy)
@@ -78,8 +78,17 @@
 
           if @connection.respond_to?(:pk_and_sequence_for)
             pk, pk_seq = @connection.pk_and_sequence_for(table)
+          else
+            pk = 'id'
+            # preserve non-numeric columns named 'id' on tables when we do not know if the table has a primary key
+            columns.map do |column|
+              next if column.name != pk
+              unless column.number?
+                pk = nil
+                break
+              end
+            end
           end
-          pk ||= 'id'
 
           tbl.print "  create_table #{table.inspect}"
           if columns.detect { |c| c.name == pk }