diff options
Diffstat (limited to 'activerecord/lib/active_record/migration.rb')
| -rw-r--r-- | activerecord/lib/active_record/migration.rb | 34 |
1 files changed, 25 insertions, 9 deletions
diff --git a/activerecord/lib/active_record/migration.rb b/activerecord/lib/active_record/migration.rb index 42220b9a5e..360bf25a8c 100644 --- a/activerecord/lib/active_record/migration.rb +++ b/activerecord/lib/active_record/migration.rb @@ -1,3 +1,5 @@ +# frozen_string_literal: true + require "set" require "zlib" require "active_support/core_ext/module/attribute_accessors" @@ -352,9 +354,9 @@ module ActiveRecord # to match the structure of your database. # # To roll the database back to a previous migration version, use - # <tt>rails db:migrate VERSION=X</tt> where <tt>X</tt> is the version to which + # <tt>rails db:rollback VERSION=X</tt> where <tt>X</tt> is the version to which # you wish to downgrade. Alternatively, you can also use the STEP option if you - # wish to rollback last few migrations. <tt>rails db:migrate STEP=2</tt> will rollback + # wish to rollback last few migrations. <tt>rails db:rollback STEP=2</tt> will rollback # the latest two migrations. # # If any of the migrations throw an <tt>ActiveRecord::IrreversibleMigration</tt> exception, @@ -579,7 +581,8 @@ module ActiveRecord def load_schema_if_pending! if ActiveRecord::Migrator.needs_migration? || !ActiveRecord::Migrator.any_migrations? # Roundtrip to Rake to allow plugins to hook into database initialization. - FileUtils.cd Rails.root do + root = defined?(ENGINE_ROOT) ? ENGINE_ROOT : Rails.root + FileUtils.cd(root) do current_config = Base.connection_config Base.clear_all_connections! system("bin/rails db:test:prepare") @@ -731,6 +734,24 @@ module ActiveRecord execute_block { yield helper } end + # Used to specify an operation that is only run when migrating up + # (for example, populating a new column with its initial values). + # + # In the following example, the new column `published` will be given + # the value `true` for all existing records. + # + # class AddPublishedToPosts < ActiveRecord::Migration[5.2] + # def change + # add_column :posts, :published, :boolean, default: false + # up_only do + # execute "update posts set published = 'true'" + # end + # end + # end + def up_only + execute_block { yield } unless reverting? + end + # Runs the given migration classes. # Last argument can specify options: # - :direction (default is :up) @@ -1024,11 +1045,6 @@ module ActiveRecord new(:up, migrations(migrations_paths), nil) end - def schema_migrations_table_name - SchemaMigration.table_name - end - deprecate :schema_migrations_table_name - def get_all_versions(connection = Base.connection) if SchemaMigration.table_exists? SchemaMigration.all_versions.map(&:to_i) @@ -1227,7 +1243,7 @@ module ActiveRecord # Return true if a valid version is not provided. def invalid_target? - !target && @target_version && @target_version > 0 + @target_version && @target_version != 0 && !target end def execute_migration_in_transaction(migration, direction) |