module ActiveRecord
module Tasks # :nodoc:
class DatabaseAlreadyExists < StandardError; end # :nodoc:
class DatabaseNotSupported < StandardError; end # :nodoc:
# 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')
module DatabaseTasks
##
# :singleton-method:
# Extra flags passed to database CLI tool (mysqldump/pg_dump) when calling db:structure:dump
mattr_accessor :structure_dump_flags, instance_accessor: false
##
# :singleton-method:
# Extra flags passed to database CLI tool when calling db:structure:load
mattr_accessor :structure_load_flags, instance_accessor: false
extend self
attr_writer :current_config, :db_dir, :migrations_paths, :fixtures_path, :root, :env, :seed_loader
attr_accessor :database_configuration
LOCAL_HOSTS = ["127.0.0.1", "localhost"]
def check_protected_environments!
unless ENV["DISABLE_DATABASE_ENVIRONMENT_CHECK"]
current = ActiveRecord::Migrator.current_environment
stored = ActiveRecord::Migrator.last_stored_environment
if ActiveRecord::Migrator.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
def register_task(pattern, task)
@tasks ||= {}
@tasks[pattern] = task
end
register_task(/mysql/, ActiveRecord::Tasks::MySQLDatabaseTasks)
register_task(/postgresql/, ActiveRecord::Tasks::PostgreSQLDatabaseTasks)
register_task(/sqlite/, ActiveRecord::Tasks::SQLiteDatabaseTasks)
def db_dir
@db_dir ||= Rails.application.config.paths["db"].first
end
def migrations_paths
@migrations_paths ||= Rails.application.paths["db/migrate"].to_a
end
def fixtures_path
@fixtures_path ||= if ENV["FIXTURES_PATH"]
File.join(root, ENV["FIXTURES_PATH"])
else
File.join(root, "test", "fixtures")
end
end
def root
@root ||= Rails.root
end
def env
@env ||= Rails.env
end
def seed_loader
@seed_loader ||= Rails.application
end
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
def create(*arguments)
configuration = arguments.first
class_for_adapter(configuration["adapter"]).new(*arguments).create
$stdout.puts "Created database '#{configuration['database']}'"
rescue DatabaseAlreadyExists
$stderr.puts "Database '#{configuration['database']}' already exists"
rescue Exception => error
$stderr.puts error
$stderr.puts "Couldn't create database for #{configuration.inspect}"
raise
end
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
def create_current(environment = env)
each_current_configuration(environment) { |configuration|
create configuration
}
ActiveRecord::Base.establish_connection(environment.to_sym)
end
def drop(*arguments)
configuration = arguments.first
class_for_adapter(configuration["adapter"]).new(*arguments).drop
$stdout.puts "Dropped database '#{configuration['database']}'"
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
def drop_all
each_local_configuration { |configuration| drop configuration }
end
def drop_current(environment = env)
each_current_configuration(environment) { |configuration|
drop configuration
}
end
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
def charset_current(environment = env)
charset ActiveRecord::Base.configurations[environment]
end
def charset(*arguments)
configuration = arguments.first
class_for_adapter(configuration["adapter"]).new(*arguments).charset
end
def collation_current(environment = env)
collation ActiveRecord::Base.configurations[environment]
end
def collation(*arguments)
configuration = arguments.first
class_for_adapter(configuration["adapter"]).new(*arguments).collation
end
def purge(configuration)
class_for_adapter(configuration["adapter"]).new(configuration).purge
end
def purge_all
each_local_configuration { |configuration|
purge configuration
}
end
def purge_current(environment = env)
each_current_configuration(environment) { |configuration|
purge configuration
}
ActiveRecord::Base.establish_connection(environment.to_sym)
end
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
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
def load_schema(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
ActiveRecord::InternalMetadata.create_table
ActiveRecord::InternalMetadata[:environment] = ActiveRecord::Migrator.current_environment
end
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
def load_schema_current(format = ActiveRecord::Base.schema_format, file = nil, environment = env)
each_current_configuration(environment) { |configuration|
load_schema configuration, format, file
}
ActiveRecord::Base.establish_connection(environment.to_sym)
end
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)
Kernel.abort message
end
end
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
# 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")
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
private
def class_for_adapter(adapter)
key = @tasks.keys.detect { |pattern| adapter[pattern] }
unless key
raise DatabaseNotSupported, "Rake tasks not supported by '#{adapter}' adapter"
end
@tasks[key]
end
def each_current_configuration(environment)
environments = [environment]
environments << "test" if environment == "development"
configurations = ActiveRecord::Base.configurations.values_at(*environments)
configurations.compact.each do |configuration|
yield configuration unless configuration["database"].blank?
end
end
def each_local_configuration
ActiveRecord::Base.configurations.each_value do |configuration|
next unless configuration["database"]
if local_database?(configuration)
yield configuration
else
$stderr.puts "This task only modifies local databases. #{configuration['database']} is on a remote host."
end
end
end
def local_database?(configuration)
configuration["host"].blank? || LOCAL_HOSTS.include?(configuration["host"])
end
end
end
end