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 Rails commands 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

#database_configuration ⇒ Object

Returns the value of attribute database_configuration.



59
60
61
 
# File 'lib/active_record/tasks/database_tasks.rb', line 59

def database_configuration
  @database_configuration
end

#db_dir ⇒ Object 



88
89
90
 
# File 'lib/active_record/tasks/database_tasks.rb', line 88

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

#env ⇒ Object 



108
109
110
 
# File 'lib/active_record/tasks/database_tasks.rb', line 108

def env
  @env ||= Rails.env
end

#fixtures_path ⇒ Object 



96
97
98
99
100
101
102
 
# File 'lib/active_record/tasks/database_tasks.rb', line 96

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 



92
93
94
 
# File 'lib/active_record/tasks/database_tasks.rb', line 92

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

#root ⇒ Object 



104
105
106
 
# File 'lib/active_record/tasks/database_tasks.rb', line 104

def root
  @root ||= Rails.root
end

#seed_loader ⇒ Object 



116
117
118
 
# File 'lib/active_record/tasks/database_tasks.rb', line 116

def seed_loader
  @seed_loader ||= Rails.application
end

Instance Method Details

#cache_dump_filename(db_config_name, schema_cache_path: nil) ⇒ Object 



470
471
472
473
474
475
476
477
478
 
# File 'lib/active_record/tasks/database_tasks.rb', line 470

def cache_dump_filename(db_config_name, schema_cache_path: nil)
  filename = if ActiveRecord::Base.configurations.primary?(db_config_name)
    "schema_cache.yml"
  else
    "#{db_config_name}_schema_cache.yml"
  end

  schema_cache_path || ENV["SCHEMA_CACHE"] || File.join(ActiveRecord::Tasks::DatabaseTasks.db_dir, filename)
end

#charset(configuration, *arguments) ⇒ Object 



324
325
326
327
 
# File 'lib/active_record/tasks/database_tasks.rb', line 324

def charset(configuration, *arguments)
  db_config = resolve_configuration(configuration)
  database_adapter_for(db_config, *arguments).charset
end

#charset_current(env_name = env, db_name = name) ⇒ Object 



319
320
321
322
 
# File 'lib/active_record/tasks/database_tasks.rb', line 319

def charset_current(env_name = env, db_name = name)
  db_config = configs_for(env_name: env_name, name: db_name)
  charset(db_config)
end

#check_protected_environments! ⇒ Object 



63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
 
# File 'lib/active_record/tasks/database_tasks.rb', line 63

def check_protected_environments!
  unless ENV["DISABLE_DATABASE_ENVIRONMENT_CHECK"]
    current = ActiveRecord::Base.connection.migration_context.current_environment
    stored  = ActiveRecord::Base.connection.migration_context.last_stored_environment

    if ActiveRecord::Base.connection.migration_context.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

#check_schema_file(filename) ⇒ Object 



487
488
489
490
491
492
493
 
# File 'lib/active_record/tasks/database_tasks.rb', line 487

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

#check_target_version ⇒ Object 



309
310
311
312
313
 
# File 'lib/active_record/tasks/database_tasks.rb', line 309

def check_target_version
  if target_version && !(Migration::MigrationFilenameRegexp.match?(ENV["VERSION"]) || /\A\d+\z/.match?(ENV["VERSION"]))
    raise "Invalid format of target version: `VERSION=#{ENV['VERSION']}`"
  end
end

#clear_schema_cache(filename) ⇒ Object 



513
514
515
 
# File 'lib/active_record/tasks/database_tasks.rb', line 513

def clear_schema_cache(filename)
  FileUtils.rm_f filename, verbose: false
end

#collation(configuration, *arguments) ⇒ Object 



334
335
336
337
 
# File 'lib/active_record/tasks/database_tasks.rb', line 334

def collation(configuration, *arguments)
  db_config = resolve_configuration(configuration)
  database_adapter_for(db_config, *arguments).collation
end

#collation_current(env_name = env, db_name = name) ⇒ Object 



329
330
331
332
 
# File 'lib/active_record/tasks/database_tasks.rb', line 329

def collation_current(env_name = env, db_name = name)
  db_config = configs_for(env_name: env_name, name: db_name)
  collation(db_config)
end

#create(configuration, *arguments) ⇒ Object 



120
121
122
123
124
125
126
127
128
129
130
 
# File 'lib/active_record/tasks/database_tasks.rb', line 120

def create(configuration, *arguments)
  db_config = resolve_configuration(configuration)
  database_adapter_for(db_config, *arguments).create
  $stdout.puts "Created database '#{db_config.database}'" if verbose?
rescue DatabaseAlreadyExists
  $stderr.puts "Database '#{db_config.database}' already exists" if verbose?
rescue Exception => error
  $stderr.puts error
  $stderr.puts "Couldn't create '#{db_config.database}' database. Please check your configuration."
  raise
end

#create_all ⇒ Object 



132
133
134
135
136
137
138
 
# File 'lib/active_record/tasks/database_tasks.rb', line 132

def create_all
  old_pool = ActiveRecord::Base.connection_handler.retrieve_connection_pool(ActiveRecord::Base.connection_specification_name)
  each_local_configuration { |db_config| create(db_config) }
  if old_pool
    ActiveRecord::Base.connection_handler.establish_connection(old_pool.db_config)
  end
end

#create_current(environment = env, name = nil) ⇒ Object 



183
184
185
186
 
# File 'lib/active_record/tasks/database_tasks.rb', line 183

def create_current(environment = env, name = nil)
  each_current_configuration(environment, name) { |db_config| create(db_config) }
  ActiveRecord::Base.establish_connection(environment.to_sym)
end

#db_configs_with_versions(db_configs) ⇒ Object

:nodoc:



277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
 
# File 'lib/active_record/tasks/database_tasks.rb', line 277

def db_configs_with_versions(db_configs) # :nodoc:
  db_configs_with_versions = Hash.new { |h, k| h[k] = [] }

  db_configs.each do |db_config|
    ActiveRecord::Base.establish_connection(db_config)
    versions_to_run = ActiveRecord::Base.connection.migration_context.pending_migration_versions
    target_version = ActiveRecord::Tasks::DatabaseTasks.target_version

    versions_to_run.each do |version|
      next if target_version && target_version != version
      db_configs_with_versions[version] << db_config
    end
  end

  db_configs_with_versions
end

#drop(configuration, *arguments) ⇒ Object 



222
223
224
225
226
227
228
229
230
231
232
 
# File 'lib/active_record/tasks/database_tasks.rb', line 222

def drop(configuration, *arguments)
  db_config = resolve_configuration(configuration)
  database_adapter_for(db_config, *arguments).drop
  $stdout.puts "Dropped database '#{db_config.database}'" if verbose?
rescue ActiveRecord::NoDatabaseError
  $stderr.puts "Database '#{db_config.database}' does not exist"
rescue Exception => error
  $stderr.puts error
  $stderr.puts "Couldn't drop database '#{db_config.database}'"
  raise
end

#drop_all ⇒ Object 



234
235
236
 
# File 'lib/active_record/tasks/database_tasks.rb', line 234

def drop_all
  each_local_configuration { |db_config| drop(db_config) }
end

#drop_current(environment = env) ⇒ Object 



238
239
240
 
# File 'lib/active_record/tasks/database_tasks.rb', line 238

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

#dump_schema(db_config, format = ActiveRecord.schema_format) ⇒ Object

:nodoc:



423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
 
# File 'lib/active_record/tasks/database_tasks.rb', line 423

def dump_schema(db_config, format = ActiveRecord.schema_format) # :nodoc:
  require "active_record/schema_dumper"
  filename = schema_dump_path(db_config, format)
  return unless filename

  connection = ActiveRecord::Base.connection

  FileUtils.mkdir_p(db_dir)
  case format
  when :ruby
    File.open(filename, "w:utf-8") do |file|
      ActiveRecord::SchemaDumper.dump(ActiveRecord::Base.connection, file)
    end
  when :sql
    structure_dump(db_config, filename)
    if connection.schema_migration.table_exists?
      File.open(filename, "a") do |f|
        f.puts connection.dump_schema_information
        f.print "\n"
      end
    end
  end
end

#dump_schema_cache(conn, filename) ⇒ Object

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")



509
510
511
 
# File 'lib/active_record/tasks/database_tasks.rb', line 509

def dump_schema_cache(conn, filename)
  conn.schema_cache.dump_to(filename)
end

#for_each(databases) ⇒ Object 



154
155
156
157
158
159
160
161
162
163
164
165
166
167
 
# File 'lib/active_record/tasks/database_tasks.rb', line 154

def for_each(databases)
  return {} unless defined?(Rails)

  database_configs = ActiveRecord::DatabaseConfigurations.new(databases).configs_for(env_name: Rails.env)

  # if this is a single database application we don't want tasks for each primary database
  return if database_configs.count == 1

  database_configs.each do |db_config|
    next unless db_config.database_tasks?

    yield db_config.name
  end
end

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

:nodoc:



367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
 
# File 'lib/active_record/tasks/database_tasks.rb', line 367

def load_schema(db_config, format = ActiveRecord.schema_format, file = nil) # :nodoc:
  file ||= schema_dump_path(db_config, format)
  return unless file

  verbose_was, Migration.verbose = Migration.verbose, verbose? && ENV["VERBOSE"]
  check_schema_file(file)
  ActiveRecord::Base.establish_connection(db_config)

  case format
  when :ruby
    load(file)
  when :sql
    structure_load(db_config, file)
  else
    raise ArgumentError, "unknown format #{format.inspect}"
  end
  ActiveRecord::InternalMetadata.create_table
  ActiveRecord::InternalMetadata[:environment] = db_config.env_name
  ActiveRecord::InternalMetadata[:schema_sha1] = schema_sha1(file)
ensure
  Migration.verbose = verbose_was
end

#load_schema_current(format = ActiveRecord.schema_format, file = nil, environment = env) ⇒ Object 



480
481
482
483
484
485
 
# File 'lib/active_record/tasks/database_tasks.rb', line 480

def load_schema_current(format = ActiveRecord.schema_format, file = nil, environment = env)
  each_current_configuration(environment) do |db_config|
    load_schema(db_config, format, file)
  end
  ActiveRecord::Base.establish_connection(environment.to_sym)
end

#load_seed ⇒ Object 



495
496
497
498
499
500
501
502
503
 
# File 'lib/active_record/tasks/database_tasks.rb', line 495

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(version = nil) ⇒ Object 



256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
 
# File 'lib/active_record/tasks/database_tasks.rb', line 256

def migrate(version = nil)
  check_target_version

  scope = ENV["SCOPE"]
  verbose_was, Migration.verbose = Migration.verbose, verbose?

  Base.connection.migration_context.migrate(target_version) do |migration|
    if version.blank?
      scope.blank? || scope == migration.scope
    else
      migration.version == version
    end
  end.tap do |migrations_ran|
    Migration.write("No migrations ran. (using #{scope} scope)") if scope.present? && migrations_ran.empty?
  end

  ActiveRecord::Base.clear_cache!
ensure
  Migration.verbose = verbose_was
end

#migrate_status ⇒ Object 



294
295
296
297
298
299
300
301
302
303
304
305
306
307
 
# File 'lib/active_record/tasks/database_tasks.rb', line 294

def migrate_status
  unless ActiveRecord::Base.connection.schema_migration.table_exists?
    Kernel.abort "Schema migrations table does not exist yet."
  end

  # output
  puts "\ndatabase: #{ActiveRecord::Base.connection_db_config.database}\n\n"
  puts "#{'Status'.center(8)}  #{'Migration ID'.ljust(14)}  Migration Name"
  puts "-" * 50
  ActiveRecord::Base.connection.migration_context.migrations_status.each do |status, version, name|
    puts "#{status.center(8)}  #{version.ljust(14)}  #{name}"
  end
  puts
end

#name ⇒ Object 



112
113
114
 
# File 'lib/active_record/tasks/database_tasks.rb', line 112

def name
  @name ||= "primary"
end

#prepare_all ⇒ Object 



188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
 
# File 'lib/active_record/tasks/database_tasks.rb', line 188

def prepare_all
  seed = false

  each_current_configuration(env) do |db_config|
    ActiveRecord::Base.establish_connection(db_config)

    begin
      # Skipped when no database
      migrate

      if ActiveRecord.dump_schema_after_migration
        dump_schema(db_config, ActiveRecord.schema_format)
      end
    rescue ActiveRecord::NoDatabaseError
      create(db_config)

      if File.exist?(schema_dump_path(db_config))
        load_schema(
          db_config,
          ActiveRecord.schema_format,
          nil
        )
      else
        migrate
      end

      seed = true
    end
  end

  ActiveRecord::Base.establish_connection
  load_seed if seed
end

#purge(configuration) ⇒ Object 



339
340
341
342
 
# File 'lib/active_record/tasks/database_tasks.rb', line 339

def purge(configuration)
  db_config = resolve_configuration(configuration)
  database_adapter_for(db_config).purge
end

#purge_all ⇒ Object 



344
345
346
 
# File 'lib/active_record/tasks/database_tasks.rb', line 344

def purge_all
  each_local_configuration { |db_config| purge(db_config) }
end

#purge_current(environment = env) ⇒ Object 



348
349
350
351
 
# File 'lib/active_record/tasks/database_tasks.rb', line 348

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

#raise_for_multi_db(environment = env, command:) ⇒ Object 



169
170
171
172
173
174
175
176
177
178
179
180
181
 
# File 'lib/active_record/tasks/database_tasks.rb', line 169

def raise_for_multi_db(environment = env, command:)
  db_configs = configs_for(env_name: environment)

  if db_configs.count > 1
    dbs_list = []

    db_configs.each do |db|
      dbs_list << "#{command}:#{db.name}"
    end

    raise "You're using a multiple database application. To use `#{command}` you must run the namespaced task with a VERSION. Available tasks are #{dbs_list.to_sentence}."
  end
end

#reconstruct_from_schema(db_config, format = ActiveRecord.schema_format, file = nil) ⇒ Object

:nodoc:



405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
 
# File 'lib/active_record/tasks/database_tasks.rb', line 405

def reconstruct_from_schema(db_config, format = ActiveRecord.schema_format, file = nil) # :nodoc:
  file ||= schema_dump_path(db_config, format)

  check_schema_file(file) if file

  ActiveRecord::Base.establish_connection(db_config)

  if schema_up_to_date?(db_config, format, file)
    truncate_tables(db_config)
  else
    purge(db_config)
    load_schema(db_config, format, file)
  end
rescue ActiveRecord::NoDatabaseError
  create(db_config)
  load_schema(db_config, format, file)
end

#register_task(pattern, task) ⇒ Object 



79
80
81
82
 
# File 'lib/active_record/tasks/database_tasks.rb', line 79

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

#schema_dump_path(db_config, format = ActiveRecord.schema_format) ⇒ Object 



457
458
459
460
461
462
463
464
465
466
467
468
 
# File 'lib/active_record/tasks/database_tasks.rb', line 457

def schema_dump_path(db_config, format = ActiveRecord.schema_format)
  return ENV["SCHEMA"] if ENV["SCHEMA"]

  filename = db_config.schema_dump(format)
  return unless filename

  if File.dirname(filename) == ActiveRecord::Tasks::DatabaseTasks.db_dir
    filename
  else
    File.join(ActiveRecord::Tasks::DatabaseTasks.db_dir, filename)
  end
end

#schema_file_type(format = ActiveRecord.schema_format) ⇒ Object 



447
448
449
450
451
452
453
454
 
# File 'lib/active_record/tasks/database_tasks.rb', line 447

def schema_file_type(format = ActiveRecord.schema_format)
  case format
  when :ruby
    "schema.rb"
  when :sql
    "structure.sql"
  end
end

#schema_up_to_date?(configuration, format = ActiveRecord.schema_format, file = nil) ⇒ Boolean

Returns:

  • (Boolean) 


390
391
392
393
394
395
396
397
398
399
400
401
402
403
 
# File 'lib/active_record/tasks/database_tasks.rb', line 390

def schema_up_to_date?(configuration, format = ActiveRecord.schema_format, file = nil)
  db_config = resolve_configuration(configuration)

  file ||= schema_dump_path(db_config)

  return true unless file && File.exist?(file)

  ActiveRecord::Base.establish_connection(db_config)

  return false unless ActiveRecord::InternalMetadata.enabled?
  return false unless ActiveRecord::InternalMetadata.table_exists?

  ActiveRecord::InternalMetadata[:schema_sha1] == schema_sha1(file)
end

#setup_initial_database_yaml ⇒ Object 



140
141
142
143
144
145
146
147
148
149
150
151
152
 
# File 'lib/active_record/tasks/database_tasks.rb', line 140

def setup_initial_database_yaml
  return {} unless defined?(Rails)

  begin
    Rails.application.config.load_database_yaml
  rescue
    unless ActiveRecord.suppress_multiple_database_warning
      $stderr.puts "Rails couldn't infer whether you are using multiple databases from your database.yml and can't generate the tasks for the non-primary databases. If you'd like to use this feature, please simplify your ERB."
    end

    {}
  end
end

#structure_dump(configuration, *arguments) ⇒ Object 



353
354
355
356
357
358
 
# File 'lib/active_record/tasks/database_tasks.rb', line 353

def structure_dump(configuration, *arguments)
  db_config = resolve_configuration(configuration)
  filename = arguments.delete_at(0)
  flags = structure_dump_flags_for(db_config.adapter)
  database_adapter_for(db_config, *arguments).structure_dump(filename, flags)
end

#structure_dump_flags ⇒ Object

:singleton-method: Extra flags passed to database CLI tool (mysqldump/pg_dump) when calling db:schema:dump It can be used as a string/array (the typical case) or a hash (when you use multiple adapters) Example:

ActiveRecord::Tasks::DatabaseTasks.structure_dump_flags = {
  mysql2: ['--no-defaults', '--skip-add-drop-table'],
  postgres: '--no-tablespaces'
}



48
 
# File 'lib/active_record/tasks/database_tasks.rb', line 48

mattr_accessor :structure_dump_flags, instance_accessor: false

#structure_load(configuration, *arguments) ⇒ Object 



360
361
362
363
364
365
 
# File 'lib/active_record/tasks/database_tasks.rb', line 360

def structure_load(configuration, *arguments)
  db_config = resolve_configuration(configuration)
  filename = arguments.delete_at(0)
  flags = structure_load_flags_for(db_config.adapter)
  database_adapter_for(db_config, *arguments).structure_load(filename, flags)
end

#structure_load_flags ⇒ Object

:singleton-method: Extra flags passed to database CLI tool when calling db:schema:load It can be used as a string/array (the typical case) or a hash (when you use multiple adapters)



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

mattr_accessor :structure_load_flags, instance_accessor: false

#target_version ⇒ Object 



315
316
317
 
# File 'lib/active_record/tasks/database_tasks.rb', line 315

def target_version
  ENV["VERSION"].to_i if ENV["VERSION"] && !ENV["VERSION"].empty?
end

#truncate_all(environment = env) ⇒ Object 



250
251
252
253
254
 
# File 'lib/active_record/tasks/database_tasks.rb', line 250

def truncate_all(environment = env)
  configs_for(env_name: environment).each do |db_config|
    truncate_tables(db_config)
  end
end