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 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 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 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

#database_configuration ⇒ Object

Returns the value of attribute database_configuration.



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

def database_configuration
  @database_configuration
end

#db_dir ⇒ Object 



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

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 74

def env
  @env ||= Rails.env
end

#fixtures_path ⇒ Object 



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# File '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

#migrations_paths ⇒ Object 



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

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 70

def root
  @root ||= Rails.root
end

#seed_loader ⇒ Object 



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

def seed_loader
  @seed_loader ||= Rails.application
end

Instance Method Details

#charset(*arguments) ⇒ Object 



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# File '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) ⇒ Object 



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

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

#check_schema_file(filename) ⇒ Object 



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# File '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) ⇒ Object 



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# File '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) ⇒ Object 



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

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

#create(*arguments) ⇒ Object 



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# File '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 ⇒ Object 



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

def create_all
  each_local_configuration { |configuration| create configuration }
end

#create_current(environment = env) ⇒ Object 



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# File '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) ⇒ Object 



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# File '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 ⇒ Object 



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

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 126

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

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



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# File '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) ⇒ Object 



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# File '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) ⇒ Object 



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# File '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_schema_for(configuration, format = ActiveRecord::Base.schema_format, file = nil) ⇒ Object

This method is the successor of load_schema. We should rename it after load_schema went through a deprecation cycle. (Rails > 4.2)



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# File 'lib/active_record/tasks/database_tasks.rb', line 214

def load_schema_for(configuration, format = ActiveRecord::Base.schema_format, file = nil) # :nodoc:
  file ||= schema_file(format)

  case format
  when :ruby
    check_schema_file(file)
    ActiveRecord::Base.establish_connection(configuration)
    load(file)
  when :sql
    check_schema_file(file)
    structure_load(configuration, file)
  else
    raise ArgumentError, "unknown format #{format.inspect}"
  end
end

#load_seed ⇒ Object 



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# File '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 ⇒ Object 



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# File '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) ⇒ Object 



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

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 169

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 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) ⇒ Object 



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# File '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) ⇒ Object 



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# File '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) ⇒ Object 



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# File '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) ⇒ Object 



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# File '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