diff options
author | Xavier Noria <fxn@hashref.com> | 2010-05-01 02:23:47 -0700 |
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committer | Xavier Noria <fxn@hashref.com> | 2010-05-01 02:23:47 -0700 |
commit | efba1d4227514a6ce4880910a6531b0a6c3c75aa (patch) | |
tree | daff4155b8c19b915125ac0b0da458279358e743 /activerecord/lib | |
parent | 81807e0fe2879e08563c91ee6809ab6d1d0bd081 (diff) | |
parent | 6c280f3398966ffba45069500ff43d632513fe44 (diff) | |
download | rails-efba1d4227514a6ce4880910a6531b0a6c3c75aa.tar.gz rails-efba1d4227514a6ce4880910a6531b0a6c3c75aa.tar.bz2 rails-efba1d4227514a6ce4880910a6531b0a6c3c75aa.zip |
Merge commit 'rails/master'
Conflicts:
railties/guides/source/index.html.erb
Diffstat (limited to 'activerecord/lib')
10 files changed, 322 insertions, 131 deletions
diff --git a/activerecord/lib/active_record/associations.rb b/activerecord/lib/active_record/associations.rb index 6dbee9f4bf..6c64210c92 100755 --- a/activerecord/lib/active_record/associations.rb +++ b/activerecord/lib/active_record/associations.rb @@ -1737,6 +1737,14 @@ module ActiveRecord build(associations) end + def graft(*associations) + associations.each do |association| + join_associations.detect {|a| association == a} || + build(association.reflection.name, association.find_parent_in(self), association.join_class) + end + self + end + def join_associations @joins[1..-1].to_a end @@ -1745,6 +1753,16 @@ module ActiveRecord @joins[0] end + def count_aliases_from_table_joins(name) + quoted_name = join_base.active_record.connection.quote_table_name(name.downcase) + join_sql = join_base.table_joins.to_s.downcase + join_sql.blank? ? 0 : + # Table names + join_sql.scan(/join(?:\s+\w+)?\s+#{quoted_name}\son/).size + + # Table aliases + join_sql.scan(/join(?:\s+\w+)?\s+\S+\s+#{quoted_name}\son/).size + end + def instantiate(rows) rows.each_with_index do |row, i| primary_id = join_base.record_id(row) @@ -1789,22 +1807,22 @@ module ActiveRecord end protected - def build(associations, parent = nil) + def build(associations, parent = nil, join_class = Arel::InnerJoin) parent ||= @joins.last case associations when Symbol, String reflection = parent.reflections[associations.to_s.intern] or raise ConfigurationError, "Association named '#{ associations }' was not found; perhaps you misspelled it?" @reflections << reflection - @joins << build_join_association(reflection, parent) + @joins << build_join_association(reflection, parent).with_join_class(join_class) when Array associations.each do |association| - build(association, parent) + build(association, parent, join_class) end when Hash associations.keys.sort{|a,b|a.to_s<=>b.to_s}.each do |name| - build(name, parent) - build(associations[name]) + build(name, parent, join_class) + build(associations[name], nil, join_class) end else raise ConfigurationError, associations.inspect @@ -1881,6 +1899,12 @@ module ActiveRecord @table_joins = joins end + def ==(other) + other.is_a?(JoinBase) && + other.active_record == active_record && + other.table_joins == table_joins + end + def aliased_prefix "t0" end @@ -1946,6 +1970,27 @@ module ActiveRecord end end + def ==(other) + other.is_a?(JoinAssociation) && + other.reflection == reflection && + other.parent == parent + end + + def find_parent_in(other_join_dependency) + other_join_dependency.joins.detect do |join| + self.parent == join + end + end + + def join_class + @join_class ||= Arel::InnerJoin + end + + def with_join_class(join_class) + @join_class = join_class + self + end + def association_join return @join if @join @@ -2045,27 +2090,25 @@ module ActiveRecord end def join_relation(joining_relation, join = nil) - if (relations = relation).is_a?(Array) - joining_relation.joins(Relation::JoinOperation.new(relations.first, Arel::OuterJoin, association_join.first)). - joins(Relation::JoinOperation.new(relations.last, Arel::OuterJoin, association_join.last)) - else - joining_relation.joins(Relation::JoinOperation.new(relations, Arel::OuterJoin, association_join)) - end + joining_relation.joins(self.with_join_class(Arel::OuterJoin)) end protected def aliased_table_name_for(name, suffix = nil) - if !parent.table_joins.blank? && parent.table_joins.to_s.downcase =~ %r{join(\s+\w+)?\s+#{active_record.connection.quote_table_name name.downcase}\son} - @join_dependency.table_aliases[name] += 1 + if @join_dependency.table_aliases[name].zero? + @join_dependency.table_aliases[name] = @join_dependency.count_aliases_from_table_joins(name) end - unless @join_dependency.table_aliases[name].zero? - # if the table name has been used, then use an alias + if !@join_dependency.table_aliases[name].zero? # We need an alias name = active_record.connection.table_alias_for "#{pluralize(reflection.name)}_#{parent_table_name}#{suffix}" - table_index = @join_dependency.table_aliases[name] @join_dependency.table_aliases[name] += 1 - name = name[0..active_record.connection.table_alias_length-3] + "_#{table_index+1}" if table_index > 0 + if @join_dependency.table_aliases[name] == 1 # First time we've seen this name + # Also need to count the aliases from the table_aliases to avoid incorrect count + @join_dependency.table_aliases[name] += @join_dependency.count_aliases_from_table_joins(name) + end + table_index = @join_dependency.table_aliases[name] + name = name[0..active_record.connection.table_alias_length-3] + "_#{table_index}" if table_index > 1 else @join_dependency.table_aliases[name] += 1 end diff --git a/activerecord/lib/active_record/base.rb b/activerecord/lib/active_record/base.rb index 2d7cfad80d..9ed53cc4af 100755 --- a/activerecord/lib/active_record/base.rb +++ b/activerecord/lib/active_record/base.rb @@ -931,6 +931,10 @@ module ActiveRecord #:nodoc: subclasses.each { |klass| klass.reset_inheritable_attributes; klass.reset_column_information } end + def attribute_method?(attribute) + super || (table_exists? && column_names.include?(attribute.to_s.sub(/=$/, ''))) + end + # Set the lookup ancestors for ActiveModel. def lookup_ancestors #:nodoc: klass = self diff --git a/activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb b/activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb index 0c87e052c4..b9fb452eee 100644 --- a/activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb +++ b/activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb @@ -122,6 +122,8 @@ module ActiveRecord requires_new = options[:requires_new] || !last_transaction_joinable transaction_open = false + @_current_transaction_records ||= [] + begin if block_given? if requires_new || open_transactions == 0 @@ -132,6 +134,7 @@ module ActiveRecord end increment_open_transactions transaction_open = true + @_current_transaction_records.push([]) end yield end @@ -141,8 +144,10 @@ module ActiveRecord decrement_open_transactions if open_transactions == 0 rollback_db_transaction + rollback_transaction_records(true) else rollback_to_savepoint + rollback_transaction_records(false) end end raise unless database_transaction_rollback.is_a?(ActiveRecord::Rollback) @@ -157,20 +162,35 @@ module ActiveRecord begin if open_transactions == 0 commit_db_transaction + commit_transaction_records else release_savepoint + save_point_records = @_current_transaction_records.pop + unless save_point_records.blank? + @_current_transaction_records.push([]) if @_current_transaction_records.empty? + @_current_transaction_records.last.concat(save_point_records) + end end rescue Exception => database_transaction_rollback if open_transactions == 0 rollback_db_transaction + rollback_transaction_records(true) else rollback_to_savepoint + rollback_transaction_records(false) end raise end end end + # Register a record with the current transaction so that its after_commit and after_rollback callbacks + # can be called. + def add_transaction_record(record) + last_batch = @_current_transaction_records.last + last_batch << record if last_batch + end + # Begins the transaction (and turns off auto-committing). def begin_db_transaction() end @@ -268,6 +288,42 @@ module ActiveRecord limit.to_i end end + + # Send a rollback message to all records after they have been rolled back. If rollback + # is false, only rollback records since the last save point. + def rollback_transaction_records(rollback) #:nodoc + if rollback + records = @_current_transaction_records.flatten + @_current_transaction_records.clear + else + records = @_current_transaction_records.pop + end + + unless records.blank? + records.uniq.each do |record| + begin + record.rolledback!(rollback) + rescue Exception => e + record.logger.error(e) if record.respond_to?(:logger) + end + end + end + end + + # Send a commit message to all records after they have been committed. + def commit_transaction_records #:nodoc + records = @_current_transaction_records.flatten + @_current_transaction_records.clear + unless records.blank? + records.uniq.each do |record| + begin + record.committed! + rescue Exception => e + record.logger.error(e) if record.respond_to?(:logger) + end + end + end + end end end end diff --git a/activerecord/lib/active_record/migration.rb b/activerecord/lib/active_record/migration.rb index c163fb982a..940f825038 100644 --- a/activerecord/lib/active_record/migration.rb +++ b/activerecord/lib/active_record/migration.rb @@ -384,9 +384,13 @@ module ActiveRecord class << self def migrate(migrations_path, target_version = nil) case - when target_version.nil? then up(migrations_path, target_version) - when current_version > target_version then down(migrations_path, target_version) - else up(migrations_path, target_version) + when target_version.nil? + up(migrations_path, target_version) + when current_version == 0 && target_version == 0 + when current_version > target_version + down(migrations_path, target_version) + else + up(migrations_path, target_version) end end diff --git a/activerecord/lib/active_record/railtie.rb b/activerecord/lib/active_record/railtie.rb index f3d21d4969..898df0a67a 100644 --- a/activerecord/lib/active_record/railtie.rb +++ b/activerecord/lib/active_record/railtie.rb @@ -61,13 +61,8 @@ module ActiveRecord # Setup database middleware after initializers have run initializer "active_record.initialize_database_middleware", :after => "action_controller.set_configs" do |app| middleware = app.config.middleware - if middleware.include?("ActiveRecord::SessionStore") - middleware.insert_before "ActiveRecord::SessionStore", ActiveRecord::ConnectionAdapters::ConnectionManagement - middleware.insert_before "ActiveRecord::SessionStore", ActiveRecord::QueryCache - else - middleware.use ActiveRecord::ConnectionAdapters::ConnectionManagement - middleware.use ActiveRecord::QueryCache - end + middleware.insert_after "::ActionDispatch::Callbacks", ActiveRecord::QueryCache + middleware.insert_after "::ActionDispatch::Callbacks", ActiveRecord::ConnectionAdapters::ConnectionManagement end initializer "active_record.set_dispatch_hooks", :before => :set_clear_dependencies_hook do |app| diff --git a/activerecord/lib/active_record/relation/finder_methods.rb b/activerecord/lib/active_record/relation/finder_methods.rb index 3514d0a259..d6144dc206 100644 --- a/activerecord/lib/active_record/relation/finder_methods.rb +++ b/activerecord/lib/active_record/relation/finder_methods.rb @@ -188,7 +188,6 @@ module ActiveRecord def construct_relation_for_association_calculations including = (@eager_load_values + @includes_values).uniq join_dependency = ActiveRecord::Associations::ClassMethods::JoinDependency.new(@klass, including, arel.joins(arel)) - relation = except(:includes, :eager_load, :preload) apply_join_dependency(relation, join_dependency) end diff --git a/activerecord/lib/active_record/relation/query_methods.rb b/activerecord/lib/active_record/relation/query_methods.rb index 58af930446..7bca12d85e 100644 --- a/activerecord/lib/active_record/relation/query_methods.rb +++ b/activerecord/lib/active_record/relation/query_methods.rb @@ -80,6 +80,26 @@ module ActiveRecord @arel ||= build_arel end + def custom_join_sql(*joins) + arel = table + joins.each do |join| + next if join.blank? + + @implicit_readonly = true + + case join + when Hash, Array, Symbol + if array_of_strings?(join) + join_string = join.join(' ') + arel = arel.join(join_string) + end + else + arel = arel.join(join) + end + end + arel.joins(arel) + end + def build_arel arel = table @@ -88,50 +108,41 @@ module ActiveRecord joins = @joins_values.map {|j| j.respond_to?(:strip) ? j.strip : j}.uniq - # Build association joins first joins.each do |join| association_joins << join if [Hash, Array, Symbol].include?(join.class) && !array_of_strings?(join) end - if association_joins.any? - join_dependency = ActiveRecord::Associations::ClassMethods::JoinDependency.new(@klass, association_joins.uniq, nil) - to_join = [] + stashed_association_joins = joins.select {|j| j.is_a?(ActiveRecord::Associations::ClassMethods::JoinDependency::JoinAssociation)} - join_dependency.join_associations.each do |association| - if (association_relation = association.relation).is_a?(Array) - to_join << [association_relation.first, association.association_join.first] - to_join << [association_relation.last, association.association_join.last] - else - to_join << [association_relation, association.association_join] - end - end + non_association_joins = (joins - association_joins - stashed_association_joins).reject {|j| j.blank?} + custom_joins = custom_join_sql(*non_association_joins) - to_join.each do |tj| - unless joined_associations.detect {|ja| ja[0] == tj[0] && ja[1] == tj[1] } - joined_associations << tj - arel = arel.join(tj[0]).on(*tj[1]) - end - end - end + join_dependency = ActiveRecord::Associations::ClassMethods::JoinDependency.new(@klass, association_joins, custom_joins) - joins.each do |join| - next if join.blank? + join_dependency.graft(*stashed_association_joins) - @implicit_readonly = true + @implicit_readonly = true unless association_joins.empty? && stashed_association_joins.empty? - case join - when Relation::JoinOperation - arel = arel.join(join.relation, join.join_class).on(*join.on) - when Hash, Array, Symbol - if array_of_strings?(join) - join_string = join.join(' ') - arel = arel.join(join_string) - end + to_join = [] + + join_dependency.join_associations.each do |association| + if (association_relation = association.relation).is_a?(Array) + to_join << [association_relation.first, association.join_class, association.association_join.first] + to_join << [association_relation.last, association.join_class, association.association_join.last] else - arel = arel.join(join) + to_join << [association_relation, association.join_class, association.association_join] end end + to_join.each do |tj| + unless joined_associations.detect {|ja| ja[0] == tj[0] && ja[1] == tj[1] && ja[2] == tj[2] } + joined_associations << tj + arel = arel.join(tj[0], tj[1]).on(*tj[2]) + end + end + + arel = arel.join(custom_joins) + @where_values.uniq.each do |where| next if where.blank? diff --git a/activerecord/lib/active_record/serializers/xml_serializer.rb b/activerecord/lib/active_record/serializers/xml_serializer.rb index 255b03433d..b2d4a48945 100644 --- a/activerecord/lib/active_record/serializers/xml_serializer.rb +++ b/activerecord/lib/active_record/serializers/xml_serializer.rb @@ -182,16 +182,31 @@ module ActiveRecord #:nodoc: options[:except] |= Array.wrap(@serializable.class.inheritance_column) end + def add_extra_behavior + add_includes + end + + def add_includes + procs = options.delete(:procs) + @serializable.send(:serializable_add_includes, options) do |association, records, opts| + add_associations(association, records, opts) + end + options[:procs] = procs + end + + # TODO This can likely be cleaned up to simple use ActiveSupport::XmlMini.to_tag as well. def add_associations(association, records, opts) + association_name = association.to_s.singularize + merged_options = options.merge(opts).merge!(:root => association_name, :skip_instruct => true) + if records.is_a?(Enumerable) - tag = reformat_name(association.to_s) - type = options[:skip_types] ? {} : {:type => "array"} + tag = ActiveSupport::XmlMini.rename_key(association.to_s, options) + type = options[:skip_types] ? { } : {:type => "array"} if records.empty? - builder.tag!(tag, type) + @builder.tag!(tag, type) else - builder.tag!(tag, type) do - association_name = association.to_s.singularize + @builder.tag!(tag, type) do records.each do |record| if options[:skip_types] record_type = {} @@ -200,60 +215,30 @@ module ActiveRecord #:nodoc: record_type = {:type => record_class} end - record.to_xml opts.merge(:root => association_name).merge(record_type) + record.to_xml merged_options.merge(record_type) end end end - else - if record = @serializable.send(association) - record.to_xml(opts.merge(:root => association)) - end - end - end - - def serialize - args = [root] - if options[:namespace] - args << {:xmlns=>options[:namespace]} - end - - if options[:type] - args << {:type=>options[:type]} - end - - builder.tag!(*args) do - add_attributes - procs = options.delete(:procs) - @serializable.send(:serializable_add_includes, options) { |association, records, opts| - add_associations(association, records, opts) - } - options[:procs] = procs - add_procs - yield builder if block_given? + elsif record = @serializable.send(association) + record.to_xml(merged_options) end end class Attribute < ActiveModel::Serializers::Xml::Serializer::Attribute #:nodoc: - protected - def compute_type - type = @serializable.class.serialized_attributes.has_key?(name) ? :yaml : @serializable.class.columns_hash[name].type - - case type - when :text - :string - when :time - :datetime - else - type - end - end - end + def compute_type + type = @serializable.class.serialized_attributes.has_key?(name) ? + super : @serializable.class.columns_hash[name].type - class MethodAttribute < Attribute #:nodoc: - protected - def compute_type - Hash::XML_TYPE_NAMES[@serializable.send(name).class.name] || :string + case type + when :text + :string + when :time + :datetime + else + type end + end + protected :compute_type end end end diff --git a/activerecord/lib/active_record/transactions.rb b/activerecord/lib/active_record/transactions.rb index cf0fe8934d..796dd99f02 100644 --- a/activerecord/lib/active_record/transactions.rb +++ b/activerecord/lib/active_record/transactions.rb @@ -12,6 +12,9 @@ module ActiveRecord [:destroy, :save, :save!].each do |method| alias_method_chain method, :transactions end + + define_model_callbacks :commit, :commit_on_update, :commit_on_create, :commit_on_destroy, :only => :after + define_model_callbacks :rollback, :rollback_on_update, :rollback_on_create, :rollback_on_destroy end # Transactions are protective blocks where SQL statements are only permanent @@ -108,7 +111,7 @@ module ActiveRecord # rescue ActiveRecord::StatementInvalid # # ...which we ignore. # end - # + # # # On PostgreSQL, the transaction is now unusable. The following # # statement will cause a PostgreSQL error, even though the unique # # constraint is no longer violated: @@ -132,7 +135,7 @@ module ActiveRecord # raise ActiveRecord::Rollback # end # end - # + # # User.find(:all) # => empty # # It is also possible to requires a sub-transaction by passing @@ -147,7 +150,7 @@ module ActiveRecord # raise ActiveRecord::Rollback # end # end - # + # # User.find(:all) # => Returns only Kotori # # Most databases don't support true nested transactions. At the time of @@ -157,16 +160,31 @@ module ActiveRecord # http://dev.mysql.com/doc/refman/5.0/en/savepoints.html # for more information about savepoints. # + # === Callbacks + # + # There are two types of callbacks associated with committing and rolling back transactions: + # +after_commit+ and +after_rollback+. + # + # +after_commit+ callbacks are called on every record saved or destroyed within a + # transaction immediately after the transaction is committed. +after_rollback+ callbacks + # are called on every record saved or destroyed within a transaction immediately after the + # transaction or savepoint is rolled back. + # + # These callbacks are useful for interacting with other systems since you will be guaranteed + # that the callback is only executed when the database is in a permanent state. For example, + # +after_commit+ is a good spot to put in a hook to clearing a cache since clearing it from + # within a transaction could trigger the cache to be regenerated before the database is updated. + # # === Caveats # # If you're on MySQL, then do not use DDL operations in nested transactions # blocks that are emulated with savepoints. That is, do not execute statements # like 'CREATE TABLE' inside such blocks. This is because MySQL automatically - # releases all savepoints upon executing a DDL operation. When #transaction + # releases all savepoints upon executing a DDL operation. When +transaction+ # is finished and tries to release the savepoint it created earlier, a # database error will occur because the savepoint has already been # automatically released. The following example demonstrates the problem: - # + # # Model.connection.transaction do # BEGIN # Model.connection.transaction(:requires_new => true) do # CREATE SAVEPOINT active_record_1 # Model.connection.create_table(...) # active_record_1 now automatically released @@ -197,24 +215,55 @@ module ActiveRecord end def save_with_transactions! #:nodoc: - rollback_active_record_state! { self.class.transaction { save_without_transactions! } } + with_transaction_returning_status(:save_without_transactions!) end # Reset id and @new_record if the transaction rolls back. def rollback_active_record_state! - id_present = has_attribute?(self.class.primary_key) - previous_id = id - previous_new_record = new_record? + remember_transaction_record_state yield rescue Exception - @new_record = previous_new_record - if id_present - self.id = previous_id + restore_transaction_record_state + raise + ensure + clear_transaction_record_state + end + + # Call the after_commit callbacks + def committed! #:nodoc: + if transaction_record_state(:new_record) + _run_commit_on_create_callbacks + elsif transaction_record_state(:destroyed) + _run_commit_on_destroy_callbacks else - @attributes.delete(self.class.primary_key) - @attributes_cache.delete(self.class.primary_key) + _run_commit_on_update_callbacks + end + _run_commit_callbacks + ensure + clear_transaction_record_state + end + + # Call the after rollback callbacks. The restore_state argument indicates if the record + # state should be rolled back to the beginning or just to the last savepoint. + def rolledback!(force_restore_state = false) #:nodoc: + if transaction_record_state(:new_record) + _run_rollback_on_create_callbacks + elsif transaction_record_state(:destroyed) + _run_rollback_on_destroy_callbacks + else + _run_rollback_on_update_callbacks + end + _run_rollback_callbacks + ensure + restore_transaction_record_state(force_restore_state) + end + + # Add the record to the current transaction so that the :after_rollback and :after_commit callbacks + # can be called. + def add_to_transaction + if self.class.connection.add_transaction_record(self) + remember_transaction_record_state end - raise end # Executes +method+ within a transaction and captures its return value as a @@ -226,10 +275,59 @@ module ActiveRecord def with_transaction_returning_status(method, *args) status = nil self.class.transaction do + add_to_transaction status = send(method, *args) raise ActiveRecord::Rollback unless status end status end + + protected + + # Save the new record state and id of a record so it can be restored later if a transaction fails. + def remember_transaction_record_state #:nodoc + @_start_transaction_state ||= {} + unless @_start_transaction_state.include?(:new_record) + @_start_transaction_state[:id] = id if has_attribute?(self.class.primary_key) + @_start_transaction_state[:new_record] = @new_record + end + unless @_start_transaction_state.include?(:destroyed) + @_start_transaction_state[:destroyed] = @new_record + end + @_start_transaction_state[:level] = (@_start_transaction_state[:level] || 0) + 1 + end + + # Clear the new record state and id of a record. + def clear_transaction_record_state #:nodoc + if defined?(@_start_transaction_state) + @_start_transaction_state[:level] = (@_start_transaction_state[:level] || 0) - 1 + remove_instance_variable(:@_start_transaction_state) if @_start_transaction_state[:level] < 1 + end + end + + # Restore the new record state and id of a record that was previously saved by a call to save_record_state. + def restore_transaction_record_state(force = false) #:nodoc + if defined?(@_start_transaction_state) + @_start_transaction_state[:level] = (@_start_transaction_state[:level] || 0) - 1 + if @_start_transaction_state[:level] < 1 + restore_state = remove_instance_variable(:@_start_transaction_state) + if restore_state + @new_record = restore_state[:new_record] + @destroyed = restore_state[:destroyed] + if restore_state[:id] + self.id = restore_state[:id] + else + @attributes.delete(self.class.primary_key) + @attributes_cache.delete(self.class.primary_key) + end + end + end + end + end + + # Determine if a record was created or destroyed in a transaction. State should be one of :new_record or :destroyed. + def transaction_record_state(state) #:nodoc + @_start_transaction_state[state] if defined?(@_start_transaction_state) + end end end diff --git a/activerecord/lib/rails/generators/active_record.rb b/activerecord/lib/rails/generators/active_record.rb index d2b1e86857..5d8a8e81bc 100644 --- a/activerecord/lib/rails/generators/active_record.rb +++ b/activerecord/lib/rails/generators/active_record.rb @@ -8,16 +8,12 @@ module ActiveRecord class Base < Rails::Generators::NamedBase #:nodoc: include Rails::Generators::Migration - def self.source_root - @_ar_source_root ||= begin - if base_name && generator_name - File.expand_path(File.join(base_name, generator_name, 'templates'), File.dirname(__FILE__)) - end - end + # Set the current directory as base for the inherited generators. + def self.base_root + File.dirname(__FILE__) end # Implement the required interface for Rails::Generators::Migration. - # def self.next_migration_number(dirname) #:nodoc: next_migration_number = current_migration_number(dirname) + 1 if ActiveRecord::Base.timestamped_migrations |