diff options
-rw-r--r-- | activerecord/CHANGELOG.md | 4 | ||||
-rw-r--r-- | activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb | 13 | ||||
-rw-r--r-- | activerecord/test/cases/schema_dumper_test.rb | 5 |
3 files changed, 20 insertions, 2 deletions
diff --git a/activerecord/CHANGELOG.md b/activerecord/CHANGELOG.md index 2524082062..6b1cf4c841 100644 --- a/activerecord/CHANGELOG.md +++ b/activerecord/CHANGELOG.md @@ -85,6 +85,10 @@ *Jon Leighton* +* MySQL: use the information_schema than the describe command when we look for a primary key. *GH #3440* + + *Kenny J* + ## Rails 3.1.1 (October 7, 2011) ## * Add deprecation for the preload_associations method. Fixes #3022. diff --git a/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb b/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb index 35c2118190..306b185c5e 100644 --- a/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb +++ b/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb @@ -502,8 +502,17 @@ module ActiveRecord # Returns a table's primary key and belonging sequence. def pk_and_sequence_for(table) - execute_and_free("DESCRIBE #{quote_table_name(table)}", 'SCHEMA') do |result| - keys = each_hash(result).select { |row| row[:Key] == 'PRI' }.map { |row| row[:Field] } + sql = <<-SQL + SELECT t.constraint_type, k.column_name + FROM information_schema.table_constraints t + JOIN information_schema.key_column_usage k + USING (constraint_name, table_schema, table_name) + WHERE t.table_schema = DATABASE() + AND t.table_name = '#{table}' + SQL + + execute_and_free(sql, 'SCHEMA') do |result| + keys = each_hash(result).select { |row| row[:constraint_type] == 'PRIMARY KEY' }.map { |row| row[:column_name] } keys.length == 1 ? [keys.first, nil] : nil end end diff --git a/activerecord/test/cases/schema_dumper_test.rb b/activerecord/test/cases/schema_dumper_test.rb index 71ff727b7f..5c3a78688e 100644 --- a/activerecord/test/cases/schema_dumper_test.rb +++ b/activerecord/test/cases/schema_dumper_test.rb @@ -238,4 +238,9 @@ class SchemaDumperTest < ActiveRecord::TestCase assert_match %r(:id => false), match[1], "no table id not preserved" assert_match %r{t.string[[:space:]]+"id",[[:space:]]+:null => false$}, match[2], "non-primary key id column not preserved" end + + def test_schema_dump_keeps_id_false_when_id_is_false_and_unique_not_null_column_added + output = standard_dump + assert_match %r{create_table "subscribers", :id => false}, output + end end |