Module: ActiveRecord::Tasks::DatabaseTasks

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

Overview

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

#current_config(options = {}) ⇒ Object 



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# File 'lib/active_record/tasks/database_tasks.rb', line 114

def current_config(options = {})
  options.reverse_merge! env: env
  options[:spec] ||= "primary"
  if options.has_key?(:config)
    @current_config = options[:config]
  else
    @current_config ||= ActiveRecord::Base.configurations.configs_for(env_name: options[:env], spec_name: options[:spec]).config
  end
end

#database_configuration ⇒ Object

Returns the value of attribute database_configuration.



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# File 'lib/active_record/tasks/database_tasks.rb', line 53

def database_configuration
  @database_configuration
end

#db_dir ⇒ Object 



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# File 'lib/active_record/tasks/database_tasks.rb', line 82

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

#env ⇒ Object 



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# File 'lib/active_record/tasks/database_tasks.rb', line 102

def env
  @env ||= Rails.env
end

#fixtures_path ⇒ Object 



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# File 'lib/active_record/tasks/database_tasks.rb', line 90

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 'lib/active_record/tasks/database_tasks.rb', line 86

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

#root ⇒ Object 



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# File 'lib/active_record/tasks/database_tasks.rb', line 98

def root
  @root ||= Rails.root
end

#seed_loader ⇒ Object 



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# File 'lib/active_record/tasks/database_tasks.rb', line 110

def seed_loader
  @seed_loader ||= Rails.application
end

Instance Method Details

#cache_dump_filename(namespace) ⇒ Object 



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# File 'lib/active_record/tasks/database_tasks.rb', line 413

def cache_dump_filename(namespace)
  filename = if namespace == "primary"
    "schema_cache.yml"
  else
    "#{namespace}_schema_cache.yml"
  end

  ENV["SCHEMA_CACHE"] || File.join(ActiveRecord::Tasks::DatabaseTasks.db_dir, filename)
end

#charset(*arguments) ⇒ Object 



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# File 'lib/active_record/tasks/database_tasks.rb', line 276

def charset(*arguments)
  configuration = arguments.first
  class_for_adapter(configuration["adapter"]).new(*arguments).charset
end

#charset_current(environment = env, specification_name = spec) ⇒ Object 



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# File 'lib/active_record/tasks/database_tasks.rb', line 272

def charset_current(environment = env, specification_name = spec)
  charset ActiveRecord::Base.configurations.configs_for(env_name: environment, spec_name: specification_name).config
end

#check_protected_environments! ⇒ Object 



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# File 'lib/active_record/tasks/database_tasks.rb', line 57

def check_protected_environments!
  unless ENV["DISABLE_DATABASE_ENVIRONMENT_CHECK"]
    current = ActiveRecord::Base.connection.migration_context.current_environment
    stored  = ActiveRecord::Base.connection.migration_context.last_stored_environment

    if ActiveRecord::Base.connection.migration_context.protected_environment?
      raise ActiveRecord::ProtectedEnvironmentError.new(stored)
    end

    if stored && stored != current
      raise ActiveRecord::EnvironmentMismatchError.new(current: current, stored: stored)
    end
  end
rescue ActiveRecord::NoDatabaseError
end

#check_schema_file(filename) ⇒ Object 



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# File 'lib/active_record/tasks/database_tasks.rb', line 430

def check_schema_file(filename)
  unless File.exist?(filename)
    message = +%{#{filename} doesn't exist yet. Run `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 'lib/active_record/tasks/database_tasks.rb', line 262

def check_target_version
  if target_version && !(Migration::MigrationFilenameRegexp.match?(ENV["VERSION"]) || /\A\d+\z/.match?(ENV["VERSION"]))
    raise "Invalid format of target version: `VERSION=#{ENV['VERSION']}`"
  end
end

#collation(*arguments) ⇒ Object 



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# File 'lib/active_record/tasks/database_tasks.rb', line 285

def collation(*arguments)
  configuration = arguments.first
  class_for_adapter(configuration["adapter"]).new(*arguments).collation
end

#collation_current(environment = env, specification_name = spec) ⇒ Object 



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# File 'lib/active_record/tasks/database_tasks.rb', line 281

def collation_current(environment = env, specification_name = spec)
  collation ActiveRecord::Base.configurations.configs_for(env_name: environment, spec_name: specification_name).config
end

#create(*arguments) ⇒ Object 



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# File 'lib/active_record/tasks/database_tasks.rb', line 124

def create(*arguments)
  configuration = arguments.first
  class_for_adapter(configuration["adapter"]).new(*arguments).create
  $stdout.puts "Created database '#{configuration['database']}'" if verbose?
rescue DatabaseAlreadyExists
  $stderr.puts "Database '#{configuration['database']}' already exists" if verbose?
rescue Exception => error
  $stderr.puts error
  $stderr.puts "Couldn't create '#{configuration['database']}' database. Please check your configuration."
  raise
end

#create_all ⇒ Object 



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# File 'lib/active_record/tasks/database_tasks.rb', line 136

def create_all
  old_pool = ActiveRecord::Base.connection_handler.retrieve_connection_pool(ActiveRecord::Base.connection_specification_name)
  each_local_configuration { |configuration| create configuration }
  if old_pool
    ActiveRecord::Base.connection_handler.establish_connection(old_pool.spec.to_hash)
  end
end

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



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# File 'lib/active_record/tasks/database_tasks.rb', line 183

def create_current(environment = env, spec_name = nil)
  each_current_configuration(environment, spec_name) { |configuration|
    create configuration
  }
  ActiveRecord::Base.establish_connection(environment.to_sym)
end

#drop(*arguments) ⇒ Object 



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# File 'lib/active_record/tasks/database_tasks.rb', line 190

def drop(*arguments)
  configuration = arguments.first
  class_for_adapter(configuration["adapter"]).new(*arguments).drop
  $stdout.puts "Dropped database '#{configuration['database']}'" if verbose?
rescue ActiveRecord::NoDatabaseError
  $stderr.puts "Database '#{configuration['database']}' does not exist"
rescue Exception => error
  $stderr.puts error
  $stderr.puts "Couldn't drop database '#{configuration['database']}'"
  raise
end

#drop_all ⇒ Object 



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# File 'lib/active_record/tasks/database_tasks.rb', line 202

def drop_all
  each_local_configuration { |configuration| drop configuration }
end

#drop_current(environment = env) ⇒ Object 



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# File 'lib/active_record/tasks/database_tasks.rb', line 206

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

#dump_filename(namespace, format = ActiveRecord::Base.schema_format) ⇒ Object 



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

def dump_filename(namespace, format = ActiveRecord::Base.schema_format)
  filename = if namespace == "primary"
    schema_file_type(format)
  else
    "#{namespace}_#{schema_file_type(format)}"
  end

  ENV["SCHEMA"] || File.join(ActiveRecord::Tasks::DatabaseTasks.db_dir, filename)
end

#dump_schema(configuration, format = ActiveRecord::Base.schema_format, spec_name = "primary") ⇒ Object

:nodoc:



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# File 'lib/active_record/tasks/database_tasks.rb', line 369

def dump_schema(configuration, format = ActiveRecord::Base.schema_format, spec_name = "primary") # :nodoc:
  require "active_record/schema_dumper"
  filename = dump_filename(spec_name, format)
  connection = ActiveRecord::Base.connection

  case format
  when :ruby
    File.open(filename, "w:utf-8") do |file|
      ActiveRecord::SchemaDumper.dump(ActiveRecord::Base.connection, file)
    end
  when :sql
    structure_dump(configuration, filename)
    if connection.schema_migration.table_exists?
      File.open(filename, "a") do |f|
        f.puts connection.dump_schema_information
        f.print "\n"
      end
    end
  end
end

#dump_schema_cache(conn, filename) ⇒ Object

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

Examples:

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



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# File 'lib/active_record/tasks/database_tasks.rb', line 452

def dump_schema_cache(conn, filename)
  conn.schema_cache.clear!
  conn.data_sources.each { |table| conn.schema_cache.add(table) }
  open(filename, "wb") { |f| f.write(YAML.dump(conn.schema_cache)) }
end

#for_each(databases) ⇒ Object 



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# File 'lib/active_record/tasks/database_tasks.rb', line 156

def for_each(databases)
  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.spec_name
  end
end

#load_schema(configuration, format = ActiveRecord::Base.schema_format, file = nil, environment = env, spec_name = "primary") ⇒ Object

:nodoc:



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# File 'lib/active_record/tasks/database_tasks.rb', line 319

def load_schema(configuration, format = ActiveRecord::Base.schema_format, file = nil, environment = env, spec_name = "primary") # :nodoc:
  file ||= dump_filename(spec_name, format)

  verbose_was, Migration.verbose = Migration.verbose, verbose? && ENV["VERBOSE"]
  check_schema_file(file)
  ActiveRecord::Base.establish_connection(configuration)

  case format
  when :ruby
    load(file)
  when :sql
    structure_load(configuration, file)
  else
    raise ArgumentError, "unknown format #{format.inspect}"
  end
  ActiveRecord::InternalMetadata.create_table
  ActiveRecord::InternalMetadata[:environment] = environment
  ActiveRecord::InternalMetadata[:schema_sha1] = schema_sha1(file)
ensure
  Migration.verbose = verbose_was
end

#load_schema_current(format = ActiveRecord::Base.schema_format, file = nil, environment = env) ⇒ Object 



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# File 'lib/active_record/tasks/database_tasks.rb', line 423

def load_schema_current(format = ActiveRecord::Base.schema_format, file = nil, environment = env)
  each_current_configuration(environment) { |configuration, spec_name, env|
    load_schema(configuration, format, file, env, spec_name)
  }
  ActiveRecord::Base.establish_connection(environment.to_sym)
end

#load_seed ⇒ Object 



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# File 'lib/active_record/tasks/database_tasks.rb', line 438

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 ⇒ Object 



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# File 'lib/active_record/tasks/database_tasks.rb', line 232

def migrate
  check_target_version

  scope = ENV["SCOPE"]
  verbose_was, Migration.verbose = Migration.verbose, verbose?

  Base.connection.migration_context.migrate(target_version) do |migration|
    scope.blank? || scope == migration.scope
  end

  ActiveRecord::Base.clear_cache!
ensure
  Migration.verbose = verbose_was
end

#migrate_status ⇒ Object 



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# File 'lib/active_record/tasks/database_tasks.rb', line 247

def migrate_status
  unless ActiveRecord::Base.connection.schema_migration.table_exists?
    Kernel.abort "Schema migrations table does not exist yet."
  end

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

#purge(configuration) ⇒ Object 



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

def purge(configuration)
  class_for_adapter(configuration["adapter"]).new(configuration).purge
end

#purge_all ⇒ Object 



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# File 'lib/active_record/tasks/database_tasks.rb', line 294

def purge_all
  each_local_configuration { |configuration|
    purge configuration
  }
end

#purge_current(environment = env) ⇒ Object 



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# File 'lib/active_record/tasks/database_tasks.rb', line 300

def purge_current(environment = env)
  each_current_configuration(environment) { |configuration|
    purge configuration
  }
  ActiveRecord::Base.establish_connection(environment.to_sym)
end

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



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# File 'lib/active_record/tasks/database_tasks.rb', line 169

def raise_for_multi_db(environment = env, command:)
  db_configs = ActiveRecord::Base.configurations.configs_for(env_name: environment)

  if db_configs.count > 1
    dbs_list = []

    db_configs.each do |db|
      dbs_list << "#{command}:#{db.spec_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(configuration, format = ActiveRecord::Base.schema_format, file = nil, environment = env, spec_name = "primary") ⇒ Object

:nodoc:



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# File 'lib/active_record/tasks/database_tasks.rb', line 351

def reconstruct_from_schema(configuration, format = ActiveRecord::Base.schema_format, file = nil, environment = env, spec_name = "primary") # :nodoc:
  file ||= dump_filename(spec_name, format)

  check_schema_file(file)

  ActiveRecord::Base.establish_connection(configuration)

  if schema_up_to_date?(configuration, format, file, environment, spec_name)
    truncate_tables(configuration)
  else
    purge(configuration)
    load_schema(configuration, format, file, environment, spec_name)
  end
rescue ActiveRecord::NoDatabaseError
  create(configuration)
  load_schema(configuration, format, file, environment, spec_name)
end

#register_task(pattern, task) ⇒ Object 



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

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

#schema_file(format = ActiveRecord::Base.schema_format) ⇒ Object 



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# File 'lib/active_record/tasks/database_tasks.rb', line 390

def schema_file(format = ActiveRecord::Base.schema_format)
  File.join(db_dir, schema_file_type(format))
end

#schema_file_type(format = ActiveRecord::Base.schema_format) ⇒ Object 



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# File 'lib/active_record/tasks/database_tasks.rb', line 394

def schema_file_type(format = ActiveRecord::Base.schema_format)
  case format
  when :ruby
    "schema.rb"
  when :sql
    "structure.sql"
  end
end

#schema_up_to_date?(configuration, format = ActiveRecord::Base.schema_format, file = nil, environment = env, spec_name = "primary") ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/active_record/tasks/database_tasks.rb', line 341

def schema_up_to_date?(configuration, format = ActiveRecord::Base.schema_format, file = nil, environment = env, spec_name = "primary")
  file ||= dump_filename(spec_name, format)

  return true unless File.exist?(file)

  ActiveRecord::Base.establish_connection(configuration)
  return false unless ActiveRecord::InternalMetadata.table_exists?
  ActiveRecord::InternalMetadata[:schema_sha1] == schema_sha1(file)
end

#setup_initial_database_yaml ⇒ Object 



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# File 'lib/active_record/tasks/database_tasks.rb', line 144

def setup_initial_database_yaml
  return {} unless defined?(Rails)

  begin
    Rails.application.config.load_database_yaml
  rescue
    $stderr.puts "Rails couldn't infer whether you are using multiple databases from your database.yml and can't generate the tasks for the non-primary databases. If you'd like to use this feature, please simplify your ERB."

    {}
  end
end

#spec ⇒ Object 



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# File 'lib/active_record/tasks/database_tasks.rb', line 106

def spec
  @spec ||= "primary"
end

#structure_dump(*arguments) ⇒ Object 



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

def structure_dump(*arguments)
  configuration = arguments.first
  filename = arguments.delete_at 1
  class_for_adapter(configuration["adapter"]).new(*arguments).structure_dump(filename, structure_dump_flags)
end

#structure_dump_flags ⇒ Object

:singleton-method: Extra flags passed to database CLI tool (mysqldump/pg_dump) when calling db:structure:dump



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# File 'lib/active_record/tasks/database_tasks.rb', line 43

mattr_accessor :structure_dump_flags, instance_accessor: false

#structure_load(*arguments) ⇒ Object 



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# File 'lib/active_record/tasks/database_tasks.rb', line 313

def structure_load(*arguments)
  configuration = arguments.first
  filename = arguments.delete_at 1
  class_for_adapter(configuration["adapter"]).new(*arguments).structure_load(filename, structure_load_flags)
end

#structure_load_flags ⇒ Object

:singleton-method: Extra flags passed to database CLI tool when calling db:structure:load



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# File 'lib/active_record/tasks/database_tasks.rb', line 48

mattr_accessor :structure_load_flags, instance_accessor: false

#target_version ⇒ Object 



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# File 'lib/active_record/tasks/database_tasks.rb', line 268

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

#truncate_all(environment = env) ⇒ Object 



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# File 'lib/active_record/tasks/database_tasks.rb', line 226

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