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 in 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.read('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 129
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 125
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 190
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 138
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 134
def collation_current(environment = env)
  collation ActiveRecord::Base.configurations[environment]
end
create(*arguments)
# File activerecord/lib/active_record/tasks/database_tasks.rb, line 86
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 96
def create_all
  each_local_configuration { |configuration| create configuration }
end
create_current(environment = env)
# File activerecord/lib/active_record/tasks/database_tasks.rb, line 100
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 77
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 53
def db_dir
  @db_dir ||= Rails.application.config.paths["db"].first
end
drop(*arguments)
# File activerecord/lib/active_record/tasks/database_tasks.rb, line 107
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 115
def drop_all
  each_local_configuration { |configuration| drop configuration }
end
drop_current(environment = env)
# File activerecord/lib/active_record/tasks/database_tasks.rb, line 119
def drop_current(environment = env)
  each_current_configuration(environment) { |configuration|
    drop configuration
  }
end
env()
# File activerecord/lib/active_record/tasks/database_tasks.rb, line 69
def env
  @env ||= Rails.env
end
fixtures_path()
# File activerecord/lib/active_record/tasks/database_tasks.rb, line 61
def fixtures_path
  @fixtures_path ||= File.join(root, 'test', 'fixtures')
end
load_schema(format = ActiveRecord::Base.schema_format, file = nil)
# File activerecord/lib/active_record/tasks/database_tasks.rb, line 159
def load_schema(format = ActiveRecord::Base.schema_format, file = nil)
  load_schema_current(format, file)
end
load_schema_current(format = ActiveRecord::Base.schema_format, file = nil, environment = env)
# File activerecord/lib/active_record/tasks/database_tasks.rb, line 183
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_seed()
# File activerecord/lib/active_record/tasks/database_tasks.rb, line 198
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 57
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 143
def purge(configuration)
  class_for_adapter(configuration['adapter']).new(configuration).purge
end
register_task(pattern, task)
# File activerecord/lib/active_record/tasks/database_tasks.rb, line 44
def register_task(pattern, task)
  @tasks ||= {}
  @tasks[pattern] = task
end
root()
# File activerecord/lib/active_record/tasks/database_tasks.rb, line 65
def root
  @root ||= Rails.root
end
seed_loader()
# File activerecord/lib/active_record/tasks/database_tasks.rb, line 73
def seed_loader
  @seed_loader ||= Rails.application
end
structure_dump(*arguments)
# File activerecord/lib/active_record/tasks/database_tasks.rb, line 147
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 153
def structure_load(*arguments)
  configuration = arguments.first
  filename = arguments.delete_at 1
  class_for_adapter(configuration['adapter']).new(*arguments).structure_load(filename)
end