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Module: ActiveRecord::Tasks::DatabaseTasks

Relationships & Source Files
Defined in: activerecord/lib/active_record/tasks/database_tasks.rb

Overview

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

The tasks defined here are used with Rake tasks 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

Instance Attribute Summary

Instance Method Summary

Instance Attribute Details

#current_config(options = {}) (rw)

[ GitHub ] 

  


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


def current_config(options = {})
  options.reverse_merge! :env => env
  if options.has_key?(:config)
    @current_config = options[:config]
  else
    @current_config ||= ActiveRecord::Base.configurations[options[:env]]
  end
end


  








  

    #current_config=(value)   (rw)
  

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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 40


attr_writer :current_config, :db_dir, :migrations_paths, :fixtures_path, :root, :env, :seed_loader


  








  

    #database_configuration   (rw)
  

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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 41


attr_accessor :database_configuration


  








  

    #db_dir   (rw)
  

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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 54


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


  








  

    #db_dir=(value)   (rw)
  

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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 40


attr_writer :current_config, :db_dir, :migrations_paths, :fixtures_path, :root, :env, :seed_loader


  








  

    #env   (rw)
  

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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 74


def env
  @env ||= Rails.env
end


  








  

    #env=(value)   (rw)
  

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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 40


attr_writer :current_config, :db_dir, :migrations_paths, :fixtures_path, :root, :env, :seed_loader


  








  

    #fixtures_path   (rw)
  

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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 62


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


  








  

    #fixtures_path=(value)   (rw)
  

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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 40


attr_writer :current_config, :db_dir, :migrations_paths, :fixtures_path, :root, :env, :seed_loader


  








  

    #migrations_paths   (rw)
  

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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 58


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


  








  

    #migrations_paths=(value)   (rw)
  

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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 40


attr_writer :current_config, :db_dir, :migrations_paths, :fixtures_path, :root, :env, :seed_loader


  








  

    #root   (rw)
  

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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 70


def root
  @root ||= Rails.root
end


  








  

    #root=(value)   (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 40


attr_writer :current_config, :db_dir, :migrations_paths, :fixtures_path, :root, :env, :seed_loader


  








  

    #seed_loader   (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 78


def seed_loader
  @seed_loader ||= Rails.application
end


  








  

    #seed_loader=(value)   (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 40


attr_writer :current_config, :db_dir, :migrations_paths, :fixtures_path, :root, :env, :seed_loader


  







Instance Method Details



  

    #charset(*arguments)  
  

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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 151


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


  








  

    #charset_current(environment = env)  
  

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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 147


def charset_current(environment = env)
  charset ActiveRecord::Base.configurations[environment]
end


  








  

    #check_schema_file(filename)  
  

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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 243


def check_schema_file(filename)
  unless File.exist?(filename)
    message = %{#{filename} doesn't exist yet. Run `rake 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)
    Kernel.abort message
  end
end


  








  

    #collation(*arguments)  
  

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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 160


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


  








  

    #collation_current(environment = env)  
  

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


def collation_current(environment = env)
  collation ActiveRecord::Base.configurations[environment]
end


  








  

    #create(*arguments)  
  

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


def create(*arguments)
  configuration = arguments.first
  class_for_adapter(configuration['adapter']).new(*arguments).create
rescue DatabaseAlreadyExists
  $stderr.puts "#{configuration['database']} already exists"
rescue Exception => error
  $stderr.puts error, *(error.backtrace)
  $stderr.puts "Couldn't create database for #{configuration.inspect}"
end


  








  

    #create_all  
  

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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 101


def create_all
  each_local_configuration { |configuration| create configuration }
end


  








  

    #create_current(environment = env)  
  

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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 105


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


  








  

    #drop(*arguments)  
  

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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 112


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


  








  

    #drop_all  
  

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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 122


def drop_all
  each_local_configuration { |configuration| drop configuration }
end


  








  

    #drop_current(environment = env)  
  

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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 126


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


  








  

    #load_schema(format = ActiveRecord::Base.schema_format, file = nil)  
  

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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 194


def load_schema(format = ActiveRecord::Base.schema_format, file = nil)
  ActiveSupport::Deprecation.warn(<<-MSG.squish)
    This method will act on a specific connection in the future.
    To act on the current connection, use `load_schema_current` instead.
  MSG

  load_schema_current(format, file)
end


  








  

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

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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 236


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


  








  

    #load_schema_current_if_exists(format = ActiveRecord::Base.schema_format, file = nil, environment = env)  
  

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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 230


def load_schema_current_if_exists(format = ActiveRecord::Base.schema_format, file = nil, environment = env)
  if File.exist?(file || schema_file(format))
    load_schema_current(format, file, environment)
  end
end


  








  

    #load_seed  
  

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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 251


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  
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 132


def migrate
  raise "Empty VERSION provided" if ENV["VERSION"] && ENV["VERSION"].empty?

  verbose = ENV["VERBOSE"] ? ENV["VERBOSE"] == "true" : true
  version = ENV["VERSION"] ? ENV["VERSION"].to_i : nil
  scope   = ENV['SCOPE']
  verbose_was, Migration.verbose = Migration.verbose, verbose
  Migrator.migrate(migrations_paths, version) do |migration|
    scope.blank? || scope == migration.scope
  end
  ActiveRecord::Base.clear_cache!
ensure
  Migration.verbose = verbose_was
end


  








  

    #purge(configuration)  
  

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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 165


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


  








  

    #purge_all  
  

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


def purge_all
  each_local_configuration { |configuration|
    purge configuration
  }
end


  








  

    #purge_current(environment = env)  
  

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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 175


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


  








  

    #register_task(pattern, task)  
  

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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 45


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


  








  

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

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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 203


def schema_file(format = ActiveRecord::Base.schema_format)
  case format
  when :ruby
    File.join(db_dir, "schema.rb")
  when :sql
    File.join(db_dir, "structure.sql")
  end
end


  








  

    #structure_dump(*arguments)  
  

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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 182


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


  








  

    #structure_load(*arguments)  
  

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# File 'activerecord/lib/active_record/tasks/database_tasks.rb', line 188


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