Module: ActiveRecord::Tasks::DatabaseTasks

Extended by:
DatabaseTasks
Included in:
DatabaseTasks
Defined in:
activerecord/lib/active_record/tasks/database_tasks.rb

Overview

Active Record DatabaseTasks

ActiveRecord::Tasks::DatabaseTasks is a utility class, which encapsulates logic behind common tasks used to manage database and migrations.

The tasks defined here are used with Rails commands provided by Active Record.

In order to use DatabaseTasks, a few config values need to be set. All the needed config values are set by Rails already, so it’s necessary to do it only if you want to change the defaults or when you want to use Active Record outside of Rails (in such case after configuring the database tasks, you can also use the rake tasks defined in Active Record).

The possible config values are:

  • env: current environment (like Rails.env).

  • database_configuration: configuration of your databases (as in config/database.yml).

  • db_dir: your db directory.

  • fixtures_path: a path to fixtures directory.

  • migrations_paths: a list of paths to directories with migrations.

  • seed_loader: an object which will load seeds, it needs to respond to the load_seed method.

  • root: a path to the root of the application.

Example usage of DatabaseTasks outside Rails could look as such:

include ActiveRecord::Tasks
DatabaseTasks.database_configuration = YAML.load_file('my_database_config.yml')
DatabaseTasks.db_dir = 'db'
# other settings...

DatabaseTasks.create_current('production')

Constant Summary collapse

LOCAL_HOSTS = 
["127.0.0.1", "localhost"]

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#database_configuration ⇒ Object

Returns the value of attribute database_configuration.



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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 61

def database_configuration
  @database_configuration
end

#db_dir ⇒ Object 



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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 83

def db_dir
  @db_dir ||= Rails.application.config.paths["db"].first
end

#env ⇒ Object 



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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 103

def env
  @env ||= Rails.env
end

#fixtures_path ⇒ Object 



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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 91

def fixtures_path
  @fixtures_path ||= if ENV["FIXTURES_PATH"]
    File.join(root, ENV["FIXTURES_PATH"])
  else
    File.join(root, "test", "fixtures")
  end
end

#migrations_paths ⇒ Object 



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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 87

def migrations_paths
  @migrations_paths ||= Rails.application.paths["db/migrate"].to_a
end

#root ⇒ Object 



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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 99

def root
  @root ||= Rails.root
end

#seed_loader ⇒ Object 



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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 111

def seed_loader
  @seed_loader ||= Rails.application
end

Instance Method Details

#cache_dump_filename(db_config, schema_cache_path: nil) ⇒ Object 



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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 491

def cache_dump_filename(db_config, schema_cache_path: nil)
  schema_cache_path ||
    db_config.schema_cache_path ||
    db_config.default_schema_cache_path(ActiveRecord::Tasks::DatabaseTasks.db_dir)
end

#charset(configuration, *arguments) ⇒ Object 



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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 337

def charset(configuration, *arguments)
  db_config = resolve_configuration(configuration)
  database_adapter_for(db_config, *arguments).charset
end

#charset_current(env_name = env, db_name = name) ⇒ Object 



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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 332

def charset_current(env_name = env, db_name = name)
  db_config = configs_for(env_name: env_name, name: db_name)
  charset(db_config)
end

#check_protected_environments!(environment = env) ⇒ Object 



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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 65

def check_protected_environments!(environment = env)
  return if ENV["DISABLE_DATABASE_ENVIRONMENT_CHECK"]

  configs_for(env_name: environment).each do |db_config|
    database_adapter_for(db_config).check_current_protected_environment!(db_config, migration_class)
  end
end

#check_schema_file(filename) ⇒ Object 



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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 505

def check_schema_file(filename)
  unless File.exist?(filename)
    message = +%{#{filename} doesn't exist yet. Run `bin/rails db:migrate` to create it, then try again.}
    message << %{ If you do not intend to use a database, you should instead alter #{Rails.root}/config/application.rb to limit the frameworks that will be loaded.} if defined?(::Rails.root)
    Kernel.abort message
  end
end

#check_target_version ⇒ Object 



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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 322

def check_target_version
  if target_version && !Migration.valid_version_format?(ENV["VERSION"])
    raise "Invalid format of target version: `VERSION=#{ENV['VERSION']}`"
  end
end

#clear_schema_cache(filename) ⇒ Object 



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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 531

def clear_schema_cache(filename)
  FileUtils.rm_f filename, verbose: false
end

#collation(configuration, *arguments) ⇒ Object 



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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 347

def collation(configuration, *arguments)
  db_config = resolve_configuration(configuration)
  database_adapter_for(db_config, *arguments).collation
end

#collation_current(env_name = env, db_name = name) ⇒ Object 



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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 342

def collation_current(env_name = env, db_name = name)
  db_config = configs_for(env_name: env_name, name: db_name)
  collation(db_config)
end

#create(configuration, *arguments) ⇒ Object 



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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 115

def create(configuration, *arguments)
  db_config = resolve_configuration(configuration)
  database_adapter_for(db_config, *arguments).create
  $stdout.puts "Created database '#{db_config.database}'" if verbose?
rescue DatabaseAlreadyExists
  $stderr.puts "Database '#{db_config.database}' already exists" if verbose?
rescue Exception => error
  $stderr.puts error
  $stderr.puts "Couldn't create '#{db_config.database}' database. Please check your configuration."
  raise
end

#create_all ⇒ Object 



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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 127

def create_all
  db_config = migration_connection.pool.db_config

  each_local_configuration { |db_config| create(db_config) }

  migration_class.establish_connection(db_config)
end

#create_current(environment = env, name = nil) ⇒ Object 



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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 168

def create_current(environment = env, name = nil)
  each_current_configuration(environment, name) { |db_config| create(db_config) }

  migration_class.establish_connection(environment.to_sym)
end

#db_configs_with_versions(environment = env) ⇒ Object

:nodoc:



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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 290

def db_configs_with_versions(environment = env) # :nodoc:
  db_configs_with_versions = Hash.new { |h, k| h[k] = [] }

  with_temporary_pool_for_each(env: environment) do |pool|
    db_config = pool.db_config
    versions_to_run = pool.migration_context.pending_migration_versions
    target_version = ActiveRecord::Tasks::DatabaseTasks.target_version

    versions_to_run.each do |version|
      next if target_version && target_version != version
      db_configs_with_versions[version] << db_config
    end
  end

  db_configs_with_versions
end

#drop(configuration, *arguments) ⇒ Object 



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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 208

def drop(configuration, *arguments)
  db_config = resolve_configuration(configuration)
  database_adapter_for(db_config, *arguments).drop
  $stdout.puts "Dropped database '#{db_config.database}'" if verbose?
rescue ActiveRecord::NoDatabaseError
  $stderr.puts "Database '#{db_config.database}' does not exist"
rescue Exception => error
  $stderr.puts error
  $stderr.puts "Couldn't drop database '#{db_config.database}'"
  raise
end

#drop_all ⇒ Object 



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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 220

def drop_all
  each_local_configuration { |db_config| drop(db_config) }
end

#drop_current(environment = env) ⇒ Object 



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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 224

def drop_current(environment = env)
  each_current_configuration(environment) { |db_config| drop(db_config) }
end

#dump_all ⇒ Object 



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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 437

def dump_all
  seen_schemas = []

  ActiveRecord::Base.configurations.configs_for(env_name: ActiveRecord::Tasks::DatabaseTasks.env).each do |db_config|
    schema_path = schema_dump_path(db_config, ENV["SCHEMA_FORMAT"] || db_config.schema_format)

    next if seen_schemas.include?(schema_path)

    ActiveRecord::Tasks::DatabaseTasks.dump_schema(db_config, ENV["SCHEMA_FORMAT"] || db_config.schema_format)
    seen_schemas << schema_path
  end
end

#dump_schema(db_config, format = db_config.schema_format) ⇒ Object

:nodoc:



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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 450

def dump_schema(db_config, format = db_config.schema_format) # :nodoc:
  return unless db_config.schema_dump

  require "active_record/schema_dumper"
  filename = schema_dump_path(db_config, format)
  return unless filename

  with_temporary_pool(db_config) do |pool|
    FileUtils.mkdir_p(db_dir)
    case format.to_sym
    when :ruby
      File.open(filename, "w:utf-8") do |file|
        ActiveRecord::SchemaDumper.dump(pool, file)
      end
    when :sql
      structure_dump(db_config, filename)
      if pool.schema_migration.table_exists?
        File.open(filename, "a") do |f|
          pool.with_connection do |connection|
            f.puts connection.dump_schema_versions
          end
          f.print "\n"
        end
      end
    end
  end
end

#dump_schema_cache(conn_or_pool, filename) ⇒ Object

Dumps the schema cache in YAML format for the connection into the file

Examples

ActiveRecord::Tasks::DatabaseTasks.dump_schema_cache(ActiveRecord::Base.lease_connection, "tmp/schema_dump.yaml")



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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 527

def dump_schema_cache(conn_or_pool, filename)
  conn_or_pool.schema_cache.dump_to(filename)
end

#for_each(databases) ⇒ Object

:nodoc:



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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 141

def for_each(databases) # :nodoc:
  return {} unless defined?(Rails)

  database_configs = ActiveRecord::DatabaseConfigurations.new(databases).configs_for(env_name: Rails.env)

  # if this is a single database application we don't want tasks for each primary database
  return if database_configs.count == 1

  database_configs.each do |db_config|
    yield db_config.name
  end
end

#load_schema(db_config, format = db_config.schema_format, file = nil) ⇒ Object

:nodoc:



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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 381

def load_schema(db_config, format = db_config.schema_format, file = nil) # :nodoc:
  format = format.to_sym
  file ||= schema_dump_path(db_config, format)
  return unless file

  verbose_was, Migration.verbose = Migration.verbose, verbose? && ENV["VERBOSE"]
  check_schema_file(file)

  case format
  when :ruby
    load(file)
  when :sql
    structure_load(db_config, file)
  else
    raise ArgumentError, "unknown format #{format.inspect}"
  end

  migration_connection_pool.internal_metadata.create_table_and_set_flags(db_config.env_name, schema_sha1(file))
ensure
  Migration.verbose = verbose_was
end

#load_schema_current(format = nil, file = nil, environment = env) ⇒ Object 



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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 497

def load_schema_current(format = nil, file = nil, environment = env)
  each_current_configuration(environment) do |db_config|
    with_temporary_connection(db_config) do
      load_schema(db_config, format || db_config.schema_format, file)
    end
  end
end

#load_seed ⇒ Object 



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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 513

def load_seed
  if seed_loader
    seed_loader.load_seed
  else
    raise "You tried to load seed data, but no seed loader is specified. Please specify seed " \
          "loader with ActiveRecord::Tasks::DatabaseTasks.seed_loader = your_seed_loader\n" \
          "Seed loader should respond to load_seed method"
  end
end

#migrate(version = nil, skip_initialize: false) ⇒ Object 



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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 267

def migrate(version = nil, skip_initialize: false)
  scope = ENV["SCOPE"]
  verbose_was, Migration.verbose = Migration.verbose, verbose?

  check_target_version

  initialize_database(migration_connection_pool.db_config) unless skip_initialize

  migration_connection_pool.migration_context.migrate(target_version) do |migration|
    if version.blank?
      scope.blank? || scope == migration.scope
    else
      migration.version == version
    end
  end.tap do |migrations_ran|
    Migration.write("No migrations ran. (using #{scope} scope)") if scope.present? && migrations_ran.empty?
  end

  migration_connection_pool.schema_cache.clear!
ensure
  Migration.verbose = verbose_was
end

#migrate_all ⇒ Object 



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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 248

def migrate_all
  db_configs = ActiveRecord::Base.configurations.configs_for(env_name: ActiveRecord::Tasks::DatabaseTasks.env)
  db_configs.each { |db_config| initialize_database(db_config) }

  if db_configs.size == 1 && db_configs.first.primary?
    ActiveRecord::Tasks::DatabaseTasks.migrate(skip_initialize: true)
  else
    mapped_versions = ActiveRecord::Tasks::DatabaseTasks.db_configs_with_versions

    mapped_versions.sort.each do |version, db_configs|
      db_configs.each do |db_config|
        ActiveRecord::Tasks::DatabaseTasks.with_temporary_connection(db_config) do
          ActiveRecord::Tasks::DatabaseTasks.migrate(version, skip_initialize: true)
        end
      end
    end
  end
end

#migrate_status ⇒ Object 



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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 307

def migrate_status
  unless migration_connection_pool.schema_migration.table_exists?
    Kernel.abort "Schema migrations table does not exist yet."
  end

  # output
  puts "\ndatabase: #{migration_connection_pool.db_config.database}\n\n"
  puts "#{'Status'.center(8)}  #{'Migration ID'.ljust(14)}  Migration Name"
  puts "-" * 50
  migration_connection_pool.migration_context.migrations_status.each do |status, version, name|
    puts "#{status.center(8)}  #{version.ljust(14)}  #{name}"
  end
  puts
end

#migration_class ⇒ Object

:nodoc:



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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 552

def migration_class # :nodoc:
  ActiveRecord::Base
end

#migration_connection ⇒ Object

:nodoc:



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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 556

def migration_connection # :nodoc:
  migration_class.lease_connection
end

#migration_connection_pool ⇒ Object

:nodoc:



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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 560

def migration_connection_pool # :nodoc:
  migration_class.connection_pool
end

#name ⇒ Object 



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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 107

def name
  @name ||= "primary"
end

#prepare_all ⇒ Object 



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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 174

def prepare_all
  seed = false
  dump_db_configs = []

  each_current_configuration(env) do |db_config|
    database_initialized = initialize_database(db_config)

    seed = true if database_initialized && db_config.seeds?
  end

  each_current_environment(env) do |environment|
    db_configs_with_versions(environment).sort.each do |version, db_configs|
      dump_db_configs |= db_configs

      db_configs.each do |db_config|
        with_temporary_pool(db_config) do
          migrate(version)
        end
      end
    end
  end

  # Dump schema for databases that were migrated.
  if ActiveRecord.dump_schema_after_migration
    dump_db_configs.each do |db_config|
      with_temporary_pool(db_config) do
        dump_schema(db_config)
      end
    end
  end

  load_seed if seed
end

#purge(configuration) ⇒ Object 



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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 352

def purge(configuration)
  db_config = resolve_configuration(configuration)
  database_adapter_for(db_config).purge
end

#purge_all ⇒ Object 



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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 357

def purge_all
  each_local_configuration { |db_config| purge(db_config) }
end

#purge_current(environment = env) ⇒ Object 



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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 361

def purge_current(environment = env)
  each_current_configuration(environment) { |db_config| purge(db_config) }

  migration_class.establish_connection(environment.to_sym)
end

#raise_for_multi_db(environment = env, command:) ⇒ Object

:nodoc:



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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 154

def raise_for_multi_db(environment = env, command:) # :nodoc:
  db_configs = configs_for(env_name: environment)

  if db_configs.count > 1
    dbs_list = []

    db_configs.each do |db|
      dbs_list << "#{command}:#{db.name}"
    end

    raise "You're using a multiple database application. To use `#{command}` you must run the namespaced task with a VERSION. Available tasks are #{dbs_list.to_sentence}."
  end
end

#reconstruct_from_schema(db_config, file = nil) ⇒ Object

:nodoc:



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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 419

def reconstruct_from_schema(db_config, file = nil) # :nodoc:
  file ||= schema_dump_path(db_config, db_config.schema_format)

  check_schema_file(file) if file

  with_temporary_pool(db_config, clobber: true) do
    if schema_up_to_date?(db_config, nil, file)
      empty_all_tables(db_config)
    else
      purge(db_config)
      load_schema(db_config, db_config.schema_format, file)
    end
  rescue ActiveRecord::NoDatabaseError
    create(db_config)
    load_schema(db_config, db_config.schema_format, file)
  end
end

#register_task(pattern, task) ⇒ Object 



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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 73

def register_task(pattern, task)
  @tasks ||= {}
  @tasks[pattern] = task
end

#schema_dump_path(db_config, format = db_config.schema_format) ⇒ Object 



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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 478

def schema_dump_path(db_config, format = db_config.schema_format)
  return ENV["SCHEMA"] if ENV["SCHEMA"]

  filename = db_config.schema_dump(format)
  return unless filename

  if Pathname.new(filename).absolute? || File.dirname(filename) == ActiveRecord::Tasks::DatabaseTasks.db_dir
    filename
  else
    File.join(ActiveRecord::Tasks::DatabaseTasks.db_dir, filename)
  end
end

#schema_up_to_date?(configuration, _ = nil, file = nil) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 403

def schema_up_to_date?(configuration, _ = nil, file = nil)
  db_config = resolve_configuration(configuration)

  file ||= schema_dump_path(db_config)

  return true unless file && File.exist?(file)

  with_temporary_pool(db_config) do |pool|
    internal_metadata = pool.internal_metadata
    return false unless internal_metadata.enabled?
    return false unless internal_metadata.table_exists?

    internal_metadata[:schema_sha1] == schema_sha1(file)
  end
end

#setup_initial_database_yaml ⇒ Object

:nodoc:



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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 135

def setup_initial_database_yaml # :nodoc:
  return {} unless defined?(Rails)

  Rails.application.config.load_database_yaml
end

#structure_dump(configuration, *arguments) ⇒ Object 



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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 367

def structure_dump(configuration, *arguments)
  db_config = resolve_configuration(configuration)
  filename = arguments.delete_at(0)
  flags = structure_dump_flags_for(db_config.adapter)
  database_adapter_for(db_config, *arguments).structure_dump(filename, flags)
end

#structure_dump_flags ⇒ Object

:singleton-method: Extra flags passed to database CLI tool (mysqldump/pg_dump) when calling db:schema:dump It can be used as a string/array (the typical case) or a hash (when you use multiple adapters) Example:

ActiveRecord::Tasks::DatabaseTasks.structure_dump_flags = {
  mysql2: ['--no-defaults', '--skip-add-drop-table'],
  postgresql: '--no-tablespaces'
}



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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 50

mattr_accessor :structure_dump_flags, instance_accessor: false

#structure_load(configuration, *arguments) ⇒ Object 



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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 374

def structure_load(configuration, *arguments)
  db_config = resolve_configuration(configuration)
  filename = arguments.delete_at(0)
  flags = structure_load_flags_for(db_config.adapter)
  database_adapter_for(db_config, *arguments).structure_load(filename, flags)
end

#structure_load_flags ⇒ Object

:singleton-method: Extra flags passed to database CLI tool when calling db:schema:load It can be used as a string/array (the typical case) or a hash (when you use multiple adapters)



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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 56

mattr_accessor :structure_load_flags, instance_accessor: false

#target_version ⇒ Object 



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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 328

def target_version
  ENV["VERSION"].to_i if ENV["VERSION"] && !ENV["VERSION"].empty?
end

#truncate_all(environment = env) ⇒ Object 



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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 242

def truncate_all(environment = env)
  configs_for(env_name: environment).each do |db_config|
    truncate_tables(db_config)
  end
end

#with_temporary_connection(db_config, clobber: false, &block) ⇒ Object

:nodoc:



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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 546

def with_temporary_connection(db_config, clobber: false, &block) # :nodoc:
  with_temporary_pool(db_config, clobber: clobber) do |pool|
    pool.with_connection(&block)
  end
end

#with_temporary_pool_for_each(env: ActiveRecord::Tasks::DatabaseTasks.env, name: nil, clobber: false, &block) ⇒ Object

:nodoc:



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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 535

def with_temporary_pool_for_each(env: ActiveRecord::Tasks::DatabaseTasks.env, name: nil, clobber: false, &block) # :nodoc:
  if name
    db_config = ActiveRecord::Base.configurations.configs_for(env_name: env, name: name)
    with_temporary_pool(db_config, clobber: clobber, &block)
  else
    ActiveRecord::Base.configurations.configs_for(env_name: env, name: name).each do |db_config|
      with_temporary_pool(db_config, clobber: clobber, &block)
    end
  end
end