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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 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')
Methods
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Constants
LOCAL_HOSTS = ['127.0.0.1', 'localhost']
 
Attributes
[W] current_config
[RW] database_configuration
[W] db_dir
[W] env
[W] fixtures_path
[W] migrations_paths
[W] root
[W] seed_loader
Instance Public methods
charset(*arguments)
# File activerecord/lib/active_record/tasks/database_tasks.rb, line 132
def charset(*arguments)
  configuration = arguments.first
  class_for_adapter(configuration['adapter']).new(*arguments).charset
end
charset_current(environment = env)
# File activerecord/lib/active_record/tasks/database_tasks.rb, line 128
def charset_current(environment = env)
  charset ActiveRecord::Base.configurations[environment]
end
check_schema_file(filename)
# File activerecord/lib/active_record/tasks/database_tasks.rb, line 189
def check_schema_file(filename)
  unless File.exist?(filename)
    message = %Q{#{filename} doesn't exist yet. Run `rake db:migrate` to create it, then try again.}
    message << %Q{ 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)
# File activerecord/lib/active_record/tasks/database_tasks.rb, line 141
def collation(*arguments)
  configuration = arguments.first
  class_for_adapter(configuration['adapter']).new(*arguments).collation
end
collation_current(environment = env)
# File activerecord/lib/active_record/tasks/database_tasks.rb, line 137
def collation_current(environment = env)
  collation ActiveRecord::Base.configurations[environment]
end
create(*arguments)
# File activerecord/lib/active_record/tasks/database_tasks.rb, line 89
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()
# File activerecord/lib/active_record/tasks/database_tasks.rb, line 99
def create_all
  each_local_configuration { |configuration| create configuration }
end
create_current(environment = env)
# File activerecord/lib/active_record/tasks/database_tasks.rb, line 103
def create_current(environment = env)
  each_current_configuration(environment) { |configuration|
    create configuration
  }
  ActiveRecord::Base.establish_connection(environment.to_sym)
end
current_config(options = {})
# File activerecord/lib/active_record/tasks/database_tasks.rb, line 80
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
db_dir()
# File activerecord/lib/active_record/tasks/database_tasks.rb, line 52
def db_dir
  @db_dir ||= Rails.application.config.paths["db"].first
end
drop(*arguments)
# File activerecord/lib/active_record/tasks/database_tasks.rb, line 110
def drop(*arguments)
  configuration = arguments.first
  class_for_adapter(configuration['adapter']).new(*arguments).drop
rescue Exception => error
  $stderr.puts error, *(error.backtrace)
  $stderr.puts "Couldn't drop #{configuration['database']}"
end
drop_all()
# File activerecord/lib/active_record/tasks/database_tasks.rb, line 118
def drop_all
  each_local_configuration { |configuration| drop configuration }
end
drop_current(environment = env)
# File activerecord/lib/active_record/tasks/database_tasks.rb, line 122
def drop_current(environment = env)
  each_current_configuration(environment) { |configuration|
    drop configuration
  }
end
env()
# File activerecord/lib/active_record/tasks/database_tasks.rb, line 72
def env
  @env ||= Rails.env
end
fixtures_path()
# File activerecord/lib/active_record/tasks/database_tasks.rb, line 60
def fixtures_path
  @fixtures_path ||= if ENV['FIXTURES_PATH']
                       File.join(root, ENV['FIXTURES_PATH'])
                     else
                       File.join(root, 'test', 'fixtures')
                     end
end
load_schema(format = ActiveRecord::Base.schema_format, file = nil)
# File activerecord/lib/active_record/tasks/database_tasks.rb, line 174
def load_schema(format = ActiveRecord::Base.schema_format, file = nil)
  case format
  when :ruby
    file ||= File.join(db_dir, "schema.rb")
    check_schema_file(file)
    load(file)
  when :sql
    file ||= File.join(db_dir, "structure.sql")
    check_schema_file(file)
    structure_load(current_config, file)
  else
    raise ArgumentError, "unknown format #{format.inspect}"
  end
end
load_seed()
# File activerecord/lib/active_record/tasks/database_tasks.rb, line 197
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
migrations_paths()
# File activerecord/lib/active_record/tasks/database_tasks.rb, line 56
def migrations_paths
  @migrations_paths ||= Rails.application.paths['db/migrate'].to_a
end
purge(configuration)
# File activerecord/lib/active_record/tasks/database_tasks.rb, line 146
def purge(configuration)
  class_for_adapter(configuration['adapter']).new(configuration).purge
end
purge_all()
# File activerecord/lib/active_record/tasks/database_tasks.rb, line 150
def purge_all
  each_local_configuration { |configuration|
    purge configuration
  }
end
purge_current(environment = env)
# File activerecord/lib/active_record/tasks/database_tasks.rb, line 156
def purge_current(environment = env)
  each_current_configuration(environment) { |configuration|
    purge configuration
  }
end
register_task(pattern, task)
# File activerecord/lib/active_record/tasks/database_tasks.rb, line 43
def register_task(pattern, task)
  @tasks ||= {}
  @tasks[pattern] = task
end
root()
# File activerecord/lib/active_record/tasks/database_tasks.rb, line 68
def root
  @root ||= Rails.root
end
seed_loader()
# File activerecord/lib/active_record/tasks/database_tasks.rb, line 76
def seed_loader
  @seed_loader ||= Rails.application
end
structure_dump(*arguments)
# File activerecord/lib/active_record/tasks/database_tasks.rb, line 162
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)
# File activerecord/lib/active_record/tasks/database_tasks.rb, line 168
def structure_load(*arguments)
  configuration = arguments.first
  filename = arguments.delete_at 1
  class_for_adapter(configuration['adapter']).new(*arguments).structure_load(filename)
end