From 0a5afa229d769bce9e221f34053bb93b60817a5a Mon Sep 17 00:00:00 2001
From: Josh Susser <josh@hasmanythrough.com>
Date: Sat, 1 Dec 2012 18:32:23 -0800
Subject: [PATCH 1/3] 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                     |  7 +++
 .../abstract/schema_statements.rb             |  6 +--
 activerecord/lib/active_record/migration.rb   | 24 ++++++---
 .../lib/active_record/schema_migration.rb     | 31 +++++++++--
 .../test/cases/migration/logger_test.rb       |  4 +-
 .../cases/migration/table_and_index_test.rb   | 24 ---------
 activerecord/test/cases/migration_test.rb     |  9 ++++
 activerecord/test/cases/migrator_test.rb      |  9 ++--
 activerecord/test/cases/schema_dumper_test.rb |  2 +-
 .../test/cases/schema_migration_test.rb       | 54 +++++++++++++++++++
 10 files changed, 126 insertions(+), 44 deletions(-)
 delete mode 100644 activerecord/test/cases/migration/table_and_index_test.rb
 create mode 100644 activerecord/test/cases/schema_migration_test.rb

diff --git a/activerecord/CHANGELOG.md b/activerecord/CHANGELOG.md
index 130d0f05d2..ecec187329 100644
--- a/activerecord/CHANGELOG.md
+++ b/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
diff --git a/activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb b/activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb
index f1e42dfbbe..7802cb02d8 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb
@@ -490,7 +490,7 @@ def dump_schema_information #:nodoc:
         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 @@ def assume_migrated_upto_version(version, migrations_paths = ActiveRecord::Migra
         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 @@ def assume_migrated_upto_version(version, migrations_paths = ActiveRecord::Migra
           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
diff --git a/activerecord/lib/active_record/migration.rb b/activerecord/lib/active_record/migration.rb
index 22347fcaef..4ce276d4bf 100644
--- a/activerecord/lib/active_record/migration.rb
+++ b/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 @@ def basename
 
     delegate :migrate, :announce, :write, :to => :migration
 
+    def fingerprint
+      @fingerprint ||= Digest::MD5.hexdigest(File.read(filename))
+    end
+
     private
 
       def migration
@@ -724,7 +729,7 @@ def run
       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 @@ def migrate
         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 @@ def validate(migrations)
       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
 
diff --git a/activerecord/lib/active_record/schema_migration.rb b/activerecord/lib/active_record/schema_migration.rb
index 9830abe7d8..fd226d5eba 100644
--- a/activerecord/lib/active_record/schema_migration.rb
+++ b/activerecord/lib/active_record/schema_migration.rb
@@ -14,17 +14,38 @@ def self.index_name
     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
diff --git a/activerecord/test/cases/migration/logger_test.rb b/activerecord/test/cases/migration/logger_test.rb
index ee0c20747e..6e62c1fcbe 100644
--- a/activerecord/test/cases/migration/logger_test.rb
+++ b/activerecord/test/cases/migration/logger_test.rb
@@ -6,10 +6,12 @@ class LoggerTest < ActiveRecord::TestCase
       # 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
diff --git a/activerecord/test/cases/migration/table_and_index_test.rb b/activerecord/test/cases/migration/table_and_index_test.rb
deleted file mode 100644
index 8fd770abd1..0000000000
--- a/activerecord/test/cases/migration/table_and_index_test.rb
+++ /dev/null
@@ -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
diff --git a/activerecord/test/cases/migration_test.rb b/activerecord/test/cases/migration_test.rb
index c155f29973..2c74bb6719 100644
--- a/activerecord/test/cases/migration_test.rb
+++ b/activerecord/test/cases/migration_test.rb
@@ -59,12 +59,21 @@ def teardown
   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
diff --git a/activerecord/test/cases/migrator_test.rb b/activerecord/test/cases/migrator_test.rb
index 1e16addcf3..0f0384382f 100644
--- a/activerecord/test/cases/migrator_test.rb
+++ b/activerecord/test/cases/migrator_test.rb
@@ -18,6 +18,9 @@ def initialize name = self.class.name, version = nil
 
       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 @@ def test_relative_migrations
     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 @@ def test_down_calls_down
     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 @@ def test_migrator_forward
 
     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)
diff --git a/activerecord/test/cases/schema_dumper_test.rb b/activerecord/test/cases/schema_dumper_test.rb
index 7ff0044bd4..2f75eb0995 100644
--- a/activerecord/test/cases/schema_dumper_test.rb
+++ b/activerecord/test/cases/schema_dumper_test.rb
@@ -18,7 +18,7 @@ def standard_dump
   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
diff --git a/activerecord/test/cases/schema_migration_test.rb b/activerecord/test/cases/schema_migration_test.rb
new file mode 100644
index 0000000000..34b9fa520a
--- /dev/null
+++ b/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

From f02d2185ebbe01f455a9a91216ff7094b014ea72 Mon Sep 17 00:00:00 2001
From: Josh Susser <josh@hasmanythrough.com>
Date: Sun, 2 Dec 2012 21:16:32 -0800
Subject: [PATCH 2/3] Add migration history to schema.rb dump

---
 activerecord/CHANGELOG.md                     | 11 ++++
 .../abstract/schema_statements.rb             |  4 +-
 activerecord/lib/active_record/schema.rb      | 40 +++++++++++----
 .../lib/active_record/schema_dumper.rb        | 17 ++++++-
 .../lib/active_record/schema_migration.rb     | 12 +++++
 activerecord/test/cases/ar_schema_test.rb     | 51 +++++++++++++++++++
 activerecord/test/cases/schema_dumper_test.rb | 18 ++++++-
 .../always_safe/1001_always_safe.rb           |  5 ++
 .../migrations/always_safe/1002_still_safe.rb |  5 ++
 9 files changed, 146 insertions(+), 17 deletions(-)
 create mode 100644 activerecord/test/migrations/always_safe/1001_always_safe.rb
 create mode 100644 activerecord/test/migrations/always_safe/1002_still_safe.rb

diff --git a/activerecord/CHANGELOG.md b/activerecord/CHANGELOG.md
index ecec187329..fdeefa4f7b 100644
--- a/activerecord/CHANGELOG.md
+++ b/activerecord/CHANGELOG.md
@@ -1,5 +1,16 @@
 ## Rails 4.0.0 (unreleased) ##
 
+*   Add migration history to schema.rb dump.
+    Loading schema.rb with full migration history
+    restores the exact list of migrations that created
+    that schema (including names and fingerprints). This
+    avoids possible mistakes caused by assuming all
+    migrations with a lower version have been run when
+    loading schema.rb. Old schema.rb files without migration
+    history but with the :version setting still work as before.
+
+    *Josh Susser*
+
 *   Add metadata columns to schema_migrations table.
     New columns are: migrated_at (timestamp),
     fingerprint (md5 hash of migration source), and
diff --git a/activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb b/activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb
index 7802cb02d8..a470e8de07 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb
@@ -490,8 +490,8 @@ def dump_schema_information #:nodoc:
         sm_table = ActiveRecord::Migrator.schema_migrations_table_name
 
         ActiveRecord::SchemaMigration.order('version').map { |sm|
-          "INSERT INTO #{sm_table} (version, migrated_at, name) VALUES ('#{sm.version}',LOCALTIMESTAMP,'#{sm.name}');"
-        }.join "\n\n"
+          "INSERT INTO #{sm_table} (version, migrated_at, fingerprint, name) VALUES ('#{sm.version}',LOCALTIMESTAMP,'#{sm.fingerprint}','#{sm.name}');"
+        }.join("\n\n")
       end
 
       # Should not be called normally, but this operation is non-destructive.
diff --git a/activerecord/lib/active_record/schema.rb b/activerecord/lib/active_record/schema.rb
index eaa4aa7086..7ec06e699b 100644
--- a/activerecord/lib/active_record/schema.rb
+++ b/activerecord/lib/active_record/schema.rb
@@ -34,27 +34,45 @@ def migrations_paths
     end
 
     def define(info, &block)
+      @using_deprecated_version_setting = info[:version].present?
+      SchemaMigration.drop_table
+      initialize_schema_migrations_table
+
       instance_eval(&block)
 
-      unless info[:version].blank?
-        initialize_schema_migrations_table
-        assume_migrated_upto_version(info[:version], migrations_paths)
-      end
+      # handle files from pre-4.0 that used :version option instead of dumping migration table
+      assume_migrated_upto_version(info[:version], migrations_paths) if @using_deprecated_version_setting
     end
 
     # Eval the given block. All methods available to the current connection
     # adapter are available within the block, so you can easily use the
     # database definition DSL to build up your schema (+create_table+,
     # +add_index+, etc.).
-    #
-    # The +info+ hash is optional, and if given is used to define metadata
-    # about the current schema (currently, only the schema's version):
-    #
-    #   ActiveRecord::Schema.define(version: 20380119000001) do
-    #     ...
-    #   end
     def self.define(info={}, &block)
       new.define(info, &block)
     end
+
+    # Create schema migration history. Include migration statements in a block to this method.
+    #
+    #   migrations do
+    #     migration 20121128235959, "44f1397e3b92442ca7488a029068a5ad", "add_horn_color_to_unicorns"
+    #     migration 20121129235959, "4a1eb3965d94406b00002b370854eae8", "add_magic_power_to_unicorns"
+    #   end
+    def migrations
+      raise(ArgumentError, "Can't set migrations while using :version option") if @using_deprecated_version_setting
+      yield
+    end
+
+    # Add a migration to the ActiveRecord::SchemaMigration table.
+    #
+    # The +version+ argument is an integer.
+    # The +fingerprint+ and +name+ arguments are required but may be empty strings.
+    # The migration's +migrated_at+ attribute is set to the current time,
+    # instead of being set explicitly as an argument to the method.
+    #
+    #   migration 20121129235959, "4a1eb3965d94406b00002b370854eae8", "add_magic_power_to_unicorns"
+    def migration(version, fingerprint, name)
+      SchemaMigration.create!(version: version, migrated_at: Time.now, fingerprint: fingerprint, name: name)
+    end
   end
 end
diff --git a/activerecord/lib/active_record/schema_dumper.rb b/activerecord/lib/active_record/schema_dumper.rb
index 36bde44e7c..73c0f5b9eb 100644
--- a/activerecord/lib/active_record/schema_dumper.rb
+++ b/activerecord/lib/active_record/schema_dumper.rb
@@ -24,6 +24,7 @@ def self.dump(connection=ActiveRecord::Base.connection, stream=STDOUT)
 
     def dump(stream)
       header(stream)
+      migrations(stream)
       tables(stream)
       trailer(stream)
       stream
@@ -44,7 +45,7 @@ def header(stream)
           stream.puts "# encoding: #{stream.external_encoding.name}"
         end
 
-        stream.puts <<HEADER
+        header_text = <<HEADER_RUBY
 # This file is auto-generated from the current state of the database. Instead
 # of editing this file, please use the migrations feature of Active Record to
 # incrementally modify your database, and then regenerate this schema definition.
@@ -59,13 +60,25 @@ def header(stream)
 
 ActiveRecord::Schema.define(#{define_params}) do
 
-HEADER
+HEADER_RUBY
+        stream.puts header_text
       end
 
       def trailer(stream)
         stream.puts "end"
       end
 
+      def migrations(stream)
+        all_migrations = ActiveRecord::SchemaMigration.all.to_a
+        if all_migrations.any?
+          stream.puts("  migrations do")
+          all_migrations.each do |migration|
+            stream.puts(migration.schema_line("    "))
+          end
+          stream.puts("  end")
+        end
+      end
+
       def tables(stream)
         @connection.tables.sort.each do |tbl|
           next if ['schema_migrations', ignore_tables].flatten.any? do |ignored|
diff --git a/activerecord/lib/active_record/schema_migration.rb b/activerecord/lib/active_record/schema_migration.rb
index fd226d5eba..4464f54145 100644
--- a/activerecord/lib/active_record/schema_migration.rb
+++ b/activerecord/lib/active_record/schema_migration.rb
@@ -53,5 +53,17 @@ def self.drop_table
     def version
       super.to_i
     end
+
+    # Construct ruby source to include in schema.rb dump for this migration.
+    # Pass a string of spaces as +indent+ to allow calling code to control how deeply indented the line is.
+    # The generated line includes the migration version, fingerprint, and name. Either fingerprint or name
+    # can be an empty string.
+    #
+    # Example output:
+    #
+    #   migration 20121129235959, "ee4be703f9e6e2fc0f4baddebe6eb8f7", "add_magic_power_to_unicorns"
+    def schema_line(indent)
+      %Q(#{indent}migration %s, "%s", "%s") % [version, fingerprint, name]
+    end
   end
 end
diff --git a/activerecord/test/cases/ar_schema_test.rb b/activerecord/test/cases/ar_schema_test.rb
index b2eac0349b..bd47ba8741 100644
--- a/activerecord/test/cases/ar_schema_test.rb
+++ b/activerecord/test/cases/ar_schema_test.rb
@@ -46,4 +46,55 @@ def test_schema_subclass
     end
   end
 
+  class ActiveRecordSchemaMigrationsTest < ActiveRecordSchemaTest
+    def setup
+      super
+      ActiveRecord::SchemaMigration.delete_all
+    end
+
+    def test_migration_adds_row_to_migrations_table
+      schema = ActiveRecord::Schema.new
+      schema.migration(1001, "", "")
+      schema.migration(1002, "123456789012345678901234567890ab", "add_magic_power_to_unicorns")
+
+      migrations = ActiveRecord::SchemaMigration.all.to_a
+      assert_equal 2, migrations.length
+
+      assert_equal 1001, migrations[0].version
+      assert_match %r{^2\d\d\d-}, migrations[0].migrated_at.to_s(:db)
+      assert_equal "", migrations[0].fingerprint
+      assert_equal "", migrations[0].name
+
+      assert_equal 1002, migrations[1].version
+      assert_match %r{^2\d\d\d-}, migrations[1].migrated_at.to_s(:db)
+      assert_equal "123456789012345678901234567890ab", migrations[1].fingerprint
+      assert_equal "add_magic_power_to_unicorns", migrations[1].name
+    end
+
+    def test_define_clears_schema_migrations
+      assert_nothing_raised do
+        ActiveRecord::Schema.define do
+          migrations do
+            migration(123001, "", "")
+          end
+        end
+        ActiveRecord::Schema.define do
+          migrations do
+            migration(123001, "", "")
+          end
+        end
+      end
+    end
+
+    def test_define_raises_if_both_version_and_explicit_migrations
+      assert_raise(ArgumentError) do
+        ActiveRecord::Schema.define(version: 123001) do
+          migrations do
+            migration(123001, "", "")
+          end
+        end
+      end
+    end
+  end
+
 end
diff --git a/activerecord/test/cases/schema_dumper_test.rb b/activerecord/test/cases/schema_dumper_test.rb
index 2f75eb0995..373463c8ab 100644
--- a/activerecord/test/cases/schema_dumper_test.rb
+++ b/activerecord/test/cases/schema_dumper_test.rb
@@ -1,5 +1,5 @@
 require "cases/helper"
-
+# require "cases/migration/helper"
 
 class SchemaDumperTest < ActiveRecord::TestCase
   def setup
@@ -18,11 +18,15 @@ def standard_dump
   def test_dump_schema_information_outputs_lexically_ordered_versions
     versions = %w{ 20100101010101 20100201010101 20100301010101 }
     versions.reverse.each do |v|
-      ActiveRecord::SchemaMigration.create!(:version => v, :name => "anon", :migrated_at => Time.now)
+      ActiveRecord::SchemaMigration.create!(
+        :version => v, :migrated_at => Time.now,
+        :fingerprint => "123456789012345678901234567890ab", :name => "anon")
     end
 
     schema_info = ActiveRecord::Base.connection.dump_schema_information
     assert_match(/20100201010101.*20100301010101/m, schema_info)
+    target_line = %q{INSERT INTO schema_migrations (version, migrated_at, fingerprint, name) VALUES ('20100101010101',LOCALTIMESTAMP,'123456789012345678901234567890ab','anon');}
+    assert_match target_line, schema_info
   end
 
   def test_magic_comment
@@ -36,6 +40,16 @@ def test_schema_dump
     assert_no_match %r{create_table "schema_migrations"}, output
   end
 
+  def test_schema_dump_includes_migrations
+    ActiveRecord::SchemaMigration.delete_all
+    ActiveRecord::Migrator.migrate(MIGRATIONS_ROOT + "/always_safe")
+
+    output = standard_dump
+    assert_match %r{migrations do}, output, "Missing migrations block"
+    assert_match %r{migration 1001, "[0-9a-f]{32}", "always_safe"}, output, "Missing migration line"
+    assert_match %r{migration 1002, "[0-9a-f]{32}", "still_safe"},  output, "Missing migration line"
+  end
+
   def test_schema_dump_excludes_sqlite_sequence
     output = standard_dump
     assert_no_match %r{create_table "sqlite_sequence"}, output
diff --git a/activerecord/test/migrations/always_safe/1001_always_safe.rb b/activerecord/test/migrations/always_safe/1001_always_safe.rb
new file mode 100644
index 0000000000..454b972507
--- /dev/null
+++ b/activerecord/test/migrations/always_safe/1001_always_safe.rb
@@ -0,0 +1,5 @@
+class AlwaysSafe < ActiveRecord::Migration
+  def change
+    # do nothing to avoid side-effect conflicts from running multiple times
+  end
+end
diff --git a/activerecord/test/migrations/always_safe/1002_still_safe.rb b/activerecord/test/migrations/always_safe/1002_still_safe.rb
new file mode 100644
index 0000000000..7398ae27a2
--- /dev/null
+++ b/activerecord/test/migrations/always_safe/1002_still_safe.rb
@@ -0,0 +1,5 @@
+class StillSafe < ActiveRecord::Migration
+  def change
+    # do nothing to avoid side-effect conflicts from running multiple times
+  end
+end

From 94ef7b515b9bd026a0ed67ef7dabbf0b4ab554e3 Mon Sep 17 00:00:00 2001
From: Josh Susser <josh@hasmanythrough.com>
Date: Mon, 3 Dec 2012 21:26:35 -0800
Subject: [PATCH 3/3] style cleanup

---
 activerecord/lib/active_record/schema_migration.rb | 8 ++++----
 activerecord/test/cases/migration_test.rb          | 2 +-
 activerecord/test/cases/schema_dumper_test.rb      | 1 -
 3 files changed, 5 insertions(+), 6 deletions(-)

diff --git a/activerecord/lib/active_record/schema_migration.rb b/activerecord/lib/active_record/schema_migration.rb
index 4464f54145..b2ae369eb6 100644
--- a/activerecord/lib/active_record/schema_migration.rb
+++ b/activerecord/lib/active_record/schema_migration.rb
@@ -31,10 +31,10 @@ def self.create_table
         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
+          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
diff --git a/activerecord/test/cases/migration_test.rb b/activerecord/test/cases/migration_test.rb
index 2c74bb6719..60e5a29965 100644
--- a/activerecord/test/cases/migration_test.rb
+++ b/activerecord/test/cases/migration_test.rb
@@ -346,7 +346,7 @@ def test_create_table_with_binary_column
 
     assert_nothing_raised {
       Person.connection.create_table :binary_testings do |t|
-        t.column "data", :binary, :null => false
+        t.column :data, :binary, :null => false
       end
     }
 
diff --git a/activerecord/test/cases/schema_dumper_test.rb b/activerecord/test/cases/schema_dumper_test.rb
index 373463c8ab..9056b92d65 100644
--- a/activerecord/test/cases/schema_dumper_test.rb
+++ b/activerecord/test/cases/schema_dumper_test.rb
@@ -1,5 +1,4 @@
 require "cases/helper"
-# require "cases/migration/helper"
 
 class SchemaDumperTest < ActiveRecord::TestCase
   def setup