Add support for dumping non-standard primary keys when using the SQLite3 adapter. Fix unit tests so that this feature is tested for all adapters. [#2868 state:resolved]

Signed-off-by: Yehuda Katz <wycats@yehuda-katzs-macbookpro41.local>

activerecord/lib/active_record/schema_dumper.rb

@@ -78,11 +78,14 @@ HEADER
         begin
           tbl = StringIO.new
 
+          # first dump primary key column
           if @connection.respond_to?(:pk_and_sequence_for)
             pk, pk_seq = @connection.pk_and_sequence_for(table)
+          elsif @connection.respond_to?(:primary_key)
+            pk = @connection.primary_key(table)
           end
           pk ||= 'id'
-
+          
           tbl.print "  create_table #{table.inspect}"
           if columns.detect { |c| c.name == pk }
             if pk != 'id'
@@ -94,6 +97,7 @@ HEADER
           tbl.print ", :force => true"
           tbl.puts " do |t|"
 
+          # then dump all non-primary key columns
           column_specs = columns.map do |column|
             raise StandardError, "Unknown type '#{column.sql_type}' for column '#{column.name}'" if @types[column.type].nil?
             next if column.name == pk

activerecord/test/cases/schema_dumper_test.rb

@@ -156,6 +156,13 @@ class SchemaDumperTest < ActiveRecord::TestCase
     index_definition = standard_dump.split(/\n/).grep(/add_index.*companies/).first.strip
     assert_equal 'add_index "companies", ["firm_id", "type", "rating", "ruby_type"], :name => "company_index"', index_definition
   end
+  
+  def test_schema_dump_should_honor_nonstandard_primary_keys
+    output = standard_dump
+    match = output.match(%r{create_table "movies"(.*)do})
+    assert_not_nil(match, "nonstandardpk table not found")
+    assert_match %r(:primary_key => "movieid"), match[1], "non-standard primary key not preserved"
+  end
 
   if current_adapter?(:MysqlAdapter)
     def test_schema_dump_should_not_add_default_value_for_mysql_text_field
@@ -163,13 +170,6 @@ class SchemaDumperTest < ActiveRecord::TestCase
       assert_match %r{t.text\s+"body",\s+:null => false$}, output
     end
 
-    def test_mysql_schema_dump_should_honor_nonstandard_primary_keys
-      output = standard_dump
-      match = output.match(%r{create_table "movies"(.*)do})
-      assert_not_nil(match, "nonstandardpk table not found")
-      assert_match %r(:primary_key => "movieid"), match[1], "non-standard primary key not preserved"
-    end
-
     def test_schema_dump_includes_length_for_mysql_blob_and_text_fields
       output = standard_dump
       assert_match %r{t.binary\s+"tiny_blob",\s+:limit => 255$}, output