Add metadata to schema_migrations

migrated_at: timestamp when migration run
fingerprint: md5 hash of migration source
name: filename without version or extension

activerecord/CHANGELOG.md

@@ -1,5 +1,12 @@
 ## Rails 4.0.0 (unreleased) ##
 
+*   Add metadata columns to schema_migrations table.
+    New columns are: migrated_at (timestamp),
+    fingerprint (md5 hash of migration source), and
+    name (filename minus version and extension)
+    
+    *Josh Susser*
+
 *   Add STI support to init and building associations.
     Allows you to do BaseClass.new(:type => "SubClass") as well as
     parent.children.build(:type => "SubClass") or parent.build_child

activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb

@@ -490,7 +490,7 @@ module ActiveRecord
         sm_table = ActiveRecord::Migrator.schema_migrations_table_name
 
         ActiveRecord::SchemaMigration.order('version').map { |sm|
-          "INSERT INTO #{sm_table} (version) VALUES ('#{sm.version}');"
+          "INSERT INTO #{sm_table} (version, migrated_at, name) VALUES ('#{sm.version}',LOCALTIMESTAMP,'#{sm.name}');"
         }.join "\n\n"
       end
 
@@ -512,7 +512,7 @@ module ActiveRecord
         end
 
         unless migrated.include?(version)
-          execute "INSERT INTO #{sm_table} (version) VALUES ('#{version}')"
+          ActiveRecord::SchemaMigration.create!(:version => version, :migrated_at => Time.now)
         end
 
         inserted = Set.new
@@ -520,7 +520,7 @@ module ActiveRecord
           if inserted.include?(v)
             raise "Duplicate migration #{v}. Please renumber your migrations to resolve the conflict."
           elsif v < version
-            execute "INSERT INTO #{sm_table} (version) VALUES ('#{v}')"
+            ActiveRecord::SchemaMigration.create!(:version => v, :migrated_at => Time.now)
             inserted << v
           end
         end

activerecord/lib/active_record/migration.rb

@@ -1,5 +1,6 @@
 require "active_support/core_ext/class/attribute_accessors"
 require 'set'
+require 'digest/md5'
 
 module ActiveRecord
   # Exception that can be raised to stop migrations from going backwards.
@@ -554,6 +555,10 @@ module ActiveRecord
 
     delegate :migrate, :announce, :write, :to => :migration
 
+    def fingerprint
+      @fingerprint ||= Digest::MD5.hexdigest(File.read(filename))
+    end
+
     private
 
       def migration
@@ -724,7 +729,7 @@ module ActiveRecord
       raise UnknownMigrationVersionError.new(@target_version) if target.nil?
       unless (up? && migrated.include?(target.version.to_i)) || (down? && !migrated.include?(target.version.to_i))
         target.migrate(@direction)
-        record_version_state_after_migrating(target.version)
+        record_version_state_after_migrating(target)
       end
     end
 
@@ -747,7 +752,7 @@ module ActiveRecord
         begin
           ddl_transaction do
             migration.migrate(@direction)
-            record_version_state_after_migrating(migration.version)
+            record_version_state_after_migrating(migration)
           end
         rescue => e
           canceled_msg = Base.connection.supports_ddl_transactions? ? "this and " : ""
@@ -805,13 +810,18 @@ module ActiveRecord
       raise DuplicateMigrationVersionError.new(version) if version
     end
 
-    def record_version_state_after_migrating(version)
+    def record_version_state_after_migrating(target)
       if down?
-        migrated.delete(version)
-        ActiveRecord::SchemaMigration.where(:version => version.to_s).delete_all
+        migrated.delete(target.version)
+        ActiveRecord::SchemaMigration.where(:version => target.version.to_s).delete_all
       else
-        migrated << version
-        ActiveRecord::SchemaMigration.create!(:version => version.to_s)
+        migrated << target.version
+        ActiveRecord::SchemaMigration.create!(
+          :version => target.version.to_s,
+          :migrated_at => Time.now,
+          :fingerprint => target.fingerprint,
+          :name => File.basename(target.filename,'.rb').gsub(/^\d+_/,'')
+        )
       end
     end
 

activerecord/lib/active_record/schema_migration.rb

@@ -14,17 +14,38 @@ module ActiveRecord
     end
 
     def self.create_table
-      unless connection.table_exists?(table_name)
-        connection.create_table(table_name, :id => false) do |t|
-          t.column :version, :string, :null => false
+      if connection.table_exists?(table_name)
+        cols = connection.columns(table_name).collect { |col| col.name }
+        unless cols.include?("migrated_at")
+          connection.add_column(table_name, "migrated_at", :datetime)
+          q_table_name = connection.quote_table_name(table_name)
+          q_timestamp = connection.quoted_date(Time.now)
+          connection.update("UPDATE #{q_table_name} SET migrated_at = '#{q_timestamp}' WHERE migrated_at IS NULL")
+          connection.change_column(table_name, "migrated_at", :datetime, :null => false)
         end
-        connection.add_index table_name, :version, :unique => true, :name => index_name
+        unless cols.include?("fingerprint")
+          connection.add_column(table_name, "fingerprint", :string, :limit => 32)
+        end
+        unless cols.include?("name")
+          connection.add_column(table_name, "name", :string)
+        end
+      else
+        connection.create_table(table_name, :id => false) do |t|
+          t.column "version", :string, :null => false
+          t.column "migrated_at", :datetime, :null => false
+          t.column "fingerprint", :string, :limit => 32
+          t.column "name", :string
+        end
+        connection.add_index(table_name, "version", :unique => true, :name => index_name)
       end
+      reset_column_information
     end
 
     def self.drop_table
+      if connection.index_exists?(table_name, "version", :unique => true, :name => index_name)
+        connection.remove_index(table_name, :name => index_name)
+      end
       if connection.table_exists?(table_name)
-        connection.remove_index table_name, :name => index_name
         connection.drop_table(table_name)
       end
     end

activerecord/test/cases/migration/logger_test.rb

@@ -6,10 +6,12 @@ module ActiveRecord
       # mysql can't roll back ddl changes
       self.use_transactional_fixtures = false
 
-      Migration = Struct.new(:name, :version) do
+      Migration = Struct.new(:name, :version, :filename, :fingerprint) do
         def migrate direction
           # do nothing
         end
+        def filename; "anon.rb"; end
+        def fingerprint; "123456789012345678901234567890ab"; end
       end
 
       def setup

activerecord/test/cases/migration/table_and_index_test.rb

@@ -1,24 +0,0 @@
-require "cases/helper"
-
-module ActiveRecord
-  class Migration
-    class TableAndIndexTest < ActiveRecord::TestCase
-      def test_add_schema_info_respects_prefix_and_suffix
-        conn = ActiveRecord::Base.connection
-
-        conn.drop_table(ActiveRecord::Migrator.schema_migrations_table_name) if conn.table_exists?(ActiveRecord::Migrator.schema_migrations_table_name)
-        # Use shorter prefix and suffix as in Oracle database identifier cannot be larger than 30 characters
-        ActiveRecord::Base.table_name_prefix = 'p_'
-        ActiveRecord::Base.table_name_suffix = '_s'
-        conn.drop_table(ActiveRecord::Migrator.schema_migrations_table_name) if conn.table_exists?(ActiveRecord::Migrator.schema_migrations_table_name)
-
-        conn.initialize_schema_migrations_table
-
-        assert_equal "p_unique_schema_migrations_s", conn.indexes(ActiveRecord::Migrator.schema_migrations_table_name)[0][:name]
-      ensure
-        ActiveRecord::Base.table_name_prefix = ""
-        ActiveRecord::Base.table_name_suffix = ""
-      end
-    end
-  end
-end

activerecord/test/cases/migration_test.rb

@@ -59,12 +59,21 @@ class MigrationTest < ActiveRecord::TestCase
   def test_migrator_versions
     migrations_path = MIGRATIONS_ROOT + "/valid"
     ActiveRecord::Migrator.migrations_paths = migrations_path
+    m0_path = File.join(migrations_path, "1_valid_people_have_last_names.rb")
+    m0_fingerprint = Digest::MD5.hexdigest(File.read(m0_path))
 
     ActiveRecord::Migrator.up(migrations_path)
     assert_equal 3, ActiveRecord::Migrator.current_version
     assert_equal 3, ActiveRecord::Migrator.last_version
     assert_equal false, ActiveRecord::Migrator.needs_migration?
 
+    rows = connection.select_all("SELECT * FROM #{connection.quote_table_name(ActiveRecord::Migrator.schema_migrations_table_name)}")
+    assert_equal m0_fingerprint, rows[0]["fingerprint"]
+    assert_equal "valid_people_have_last_names", rows[0]["name"]
+    rows.each do |row|
+      assert_match(/\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}/, row["migrated_at"], "missing migrated_at")
+    end
+
     ActiveRecord::Migrator.down(MIGRATIONS_ROOT + "/valid")
     assert_equal 0, ActiveRecord::Migrator.current_version
     assert_equal 3, ActiveRecord::Migrator.last_version

activerecord/test/cases/migrator_test.rb

@@ -18,6 +18,9 @@ module ActiveRecord
 
       def up; @went_up = true; end
       def down; @went_down = true; end
+      # also used in place of a MigrationProxy
+      def filename; "anon.rb"; end
+      def fingerprint; "123456789012345678901234567890ab"; end
     end
 
     def setup
@@ -102,7 +105,7 @@ module ActiveRecord
     end
 
     def test_finds_pending_migrations
-      ActiveRecord::SchemaMigration.create!(:version => '1')
+      ActiveRecord::SchemaMigration.create!(:version => '1', :name => "anon", :migrated_at => Time.now)
       migration_list = [ Migration.new('foo', 1), Migration.new('bar', 3) ]
       migrations = ActiveRecord::Migrator.new(:up, migration_list).pending_migrations
 
@@ -152,7 +155,7 @@ module ActiveRecord
     end
 
     def test_current_version
-      ActiveRecord::SchemaMigration.create!(:version => '1000')
+      ActiveRecord::SchemaMigration.create!(:version => '1000', :name => "anon", :migrated_at => Time.now)
       assert_equal 1000, ActiveRecord::Migrator.current_version
     end
 
@@ -320,7 +323,7 @@ module ActiveRecord
 
     def test_only_loads_pending_migrations
       # migrate up to 1
-      ActiveRecord::SchemaMigration.create!(:version => '1')
+      ActiveRecord::SchemaMigration.create!(:version => '1', :name => "anon", :migrated_at => Time.now)
 
       calls, migrator = migrator_class(3)
       migrator.migrate("valid", nil)

activerecord/test/cases/schema_dumper_test.rb

@@ -18,7 +18,7 @@ class SchemaDumperTest < ActiveRecord::TestCase
   def test_dump_schema_information_outputs_lexically_ordered_versions
     versions = %w{ 20100101010101 20100201010101 20100301010101 }
     versions.reverse.each do |v|
-      ActiveRecord::SchemaMigration.create!(:version => v)
+      ActiveRecord::SchemaMigration.create!(:version => v, :name => "anon", :migrated_at => Time.now)
     end
 
     schema_info = ActiveRecord::Base.connection.dump_schema_information

activerecord/test/cases/schema_migration_test.rb

@@ -0,0 +1,54 @@
+require "cases/helper"
+
+class SchemaMigrationTest < ActiveRecord::TestCase
+  def sm_table_name
+    ActiveRecord::SchemaMigration.table_name
+  end
+
+  def connection
+    ActiveRecord::Base.connection
+  end
+
+  def test_add_schema_info_respects_prefix_and_suffix
+    connection.drop_table(sm_table_name) if connection.table_exists?(sm_table_name)
+    # Use shorter prefix and suffix as in Oracle database identifier cannot be larger than 30 characters
+    ActiveRecord::Base.table_name_prefix = 'p_'
+    ActiveRecord::Base.table_name_suffix = '_s'
+    connection.drop_table(sm_table_name) if connection.table_exists?(sm_table_name)
+
+    ActiveRecord::SchemaMigration.create_table
+
+    assert_equal "p_unique_schema_migrations_s", connection.indexes(sm_table_name)[0][:name]
+  ensure
+    ActiveRecord::Base.table_name_prefix = ""
+    ActiveRecord::Base.table_name_suffix = ""
+  end
+
+  def test_add_metadata_columns_to_exisiting_schema_migrations
+    # creates the old table schema from pre-Rails4.0, so we can test adding to it below
+    if connection.table_exists?(sm_table_name)
+      connection.drop_table(sm_table_name)
+    end
+    connection.create_table(sm_table_name, :id => false) do |schema_migrations_table|
+      schema_migrations_table.column("version", :string, :null => false)
+    end
+
+    connection.insert "INSERT INTO #{connection.quote_table_name(sm_table_name)} (version) VALUES (100)"
+    connection.insert "INSERT INTO #{connection.quote_table_name(sm_table_name)} (version) VALUES (200)"
+
+    ActiveRecord::SchemaMigration.create_table
+
+    rows = connection.select_all("SELECT * FROM #{connection.quote_table_name(sm_table_name)}")
+    assert rows[0].has_key?("migrated_at"), "missing column `migrated_at`"
+    assert_match(/\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}/, rows[0]["migrated_at"])
+    assert rows[0].has_key?("fingerprint"), "missing column `fingerprint`"
+    assert rows[0].has_key?("name"), "missing column `name`"
+  end
+
+  def test_schema_migrations_columns
+    ActiveRecord::SchemaMigration.create_table
+
+    columns =  connection.columns(sm_table_name).collect(&:name)
+    %w[version migrated_at fingerprint name].each { |col| assert columns.include?(col), "missing column `#{col}`" }
+  end
+end