Module: ActiveRecord::Tasks::DatabaseTasks

Extended by:
DatabaseTasks
Included in:
DatabaseTasks
Defined in:
lib/active_record/tasks/database_tasks.rb

Overview

Active Record DatabaseTasks

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.



61
62
63
 
# File 'lib/active_record/tasks/database_tasks.rb', line 61

def database_configuration
  @database_configuration
end

#db_dir ⇒ Object 



83
84
85
 
# File 'lib/active_record/tasks/database_tasks.rb', line 83

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

#env ⇒ Object 



103
104
105
 
# File 'lib/active_record/tasks/database_tasks.rb', line 103

def env
  @env ||= Rails.env
end

#fixtures_path ⇒ Object 



91
92
93
94
95
96
97
 
# File 'lib/active_record/tasks/database_tasks.rb', line 91

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 



87
88
89
 
# File 'lib/active_record/tasks/database_tasks.rb', line 87

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

#root ⇒ Object 



99
100
101
 
# File 'lib/active_record/tasks/database_tasks.rb', line 99

def root
  @root ||= Rails.root
end

#seed_loader ⇒ Object 



111
112
113
 
# File 'lib/active_record/tasks/database_tasks.rb', line 111

def seed_loader
  @seed_loader ||= Rails.application
end

Instance Method Details

#cache_dump_filename(db_config_name, schema_cache_path: nil) ⇒ Object 



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

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!(environment = env) ⇒ Object 



65
66
67
68
69
70
71
 
# File 'lib/active_record/tasks/database_tasks.rb', line 65

def check_protected_environments!(environment = env)
  return if ENV["DISABLE_DATABASE_ENVIRONMENT_CHECK"]

  configs_for(env_name: environment).each do |db_config|
    check_current_protected_environment!(db_config)
  end
end

#check_schema_file(filename) ⇒ Object 



477
478
479
480
481
482
483
 
# File 'lib/active_record/tasks/database_tasks.rb', line 477

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.valid_version_format?(ENV["VERSION"])
    raise "Invalid format of target version: `VERSION=#{ENV['VERSION']}`"
  end
end

#clear_schema_cache(filename) ⇒ Object 



503
504
505
 
# File 'lib/active_record/tasks/database_tasks.rb', line 503

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 



115
116
117
118
119
120
121
122
123
124
125
 
# File 'lib/active_record/tasks/database_tasks.rb', line 115

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 



127
128
129
130
131
132
133
 
# File 'lib/active_record/tasks/database_tasks.rb', line 127

def create_all
  each_local_configuration do |db_config|
    with_temporary_connection(db_config) do
      create(db_config)
    end
  end
end

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



170
171
172
173
174
 
# File 'lib/active_record/tasks/database_tasks.rb', line 170

def create_current(environment = env, name = nil)
  each_current_configuration(environment, name) { |db_config| create(db_config) }

  migration_class.establish_connection(environment.to_sym)
end

#db_configs_with_versions(environment = env) ⇒ 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(environment = env) # :nodoc:
  db_configs_with_versions = Hash.new { |h, k| h[k] = [] }

  with_temporary_connection_for_each(env: environment) do |conn|
    db_config = conn.pool.db_config
    versions_to_run = conn.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 



223
224
225
226
227
228
229
230
231
232
233
 
# File 'lib/active_record/tasks/database_tasks.rb', line 223

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 



235
236
237
 
# File 'lib/active_record/tasks/database_tasks.rb', line 235

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

#drop_current(environment = env) ⇒ Object 



239
240
241
 
# File 'lib/active_record/tasks/database_tasks.rb', line 239

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:



422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
 
# File 'lib/active_record/tasks/database_tasks.rb', line 422

def dump_schema(db_config, format = ActiveRecord.schema_format) # :nodoc:
  return unless db_config.schema_dump

  require "active_record/schema_dumper"
  filename = schema_dump_path(db_config, format)
  return unless filename

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



499
500
501
 
# File 'lib/active_record/tasks/database_tasks.rb', line 499

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

#for_each(databases) ⇒ Object

:nodoc:



141
142
143
144
145
146
147
148
149
150
151
152
153
154
 
# File 'lib/active_record/tasks/database_tasks.rb', line 141

def for_each(databases) # :nodoc:
  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:



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

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)

  case format
  when :ruby
    load(file)
  when :sql
    structure_load(db_config, file)
  else
    raise ArgumentError, "unknown format #{format.inspect}"
  end

  migration_connection.internal_metadata.create_table_and_set_flags(db_config.env_name, schema_sha1(file))
ensure
  Migration.verbose = verbose_was
end

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



469
470
471
472
473
474
475
 
# File 'lib/active_record/tasks/database_tasks.rb', line 469

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

#load_seed ⇒ Object 



485
486
487
488
489
490
491
492
493
 
# File 'lib/active_record/tasks/database_tasks.rb', line 485

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

  check_target_version

  migration_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

  migration_connection.schema_cache.clear!
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 migration_connection.schema_migration.table_exists?
    Kernel.abort "Schema migrations table does not exist yet."
  end

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

#migration_class ⇒ Object

:nodoc:



524
525
526
 
# File 'lib/active_record/tasks/database_tasks.rb', line 524

def migration_class # :nodoc:
  ActiveRecord::Base
end

#migration_connection ⇒ Object

:nodoc:



528
529
530
 
# File 'lib/active_record/tasks/database_tasks.rb', line 528

def migration_connection # :nodoc:
  migration_class.connection
end

#name ⇒ Object 



107
108
109
 
# File 'lib/active_record/tasks/database_tasks.rb', line 107

def name
  @name ||= "primary"
end

#prepare_all ⇒ Object 



176
177
178
179
180
181
182
183
184
185
186
187
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
221
 
# File 'lib/active_record/tasks/database_tasks.rb', line 176

def prepare_all
  seed = false
  dump_db_configs = []

  each_current_configuration(env) do |db_config|
    with_temporary_pool(db_config) do
      begin
        database_initialized = migration_connection.schema_migration.table_exists?
      rescue ActiveRecord::NoDatabaseError
        create(db_config)
        retry
      end

      unless database_initialized
        if File.exist?(schema_dump_path(db_config))
          load_schema(db_config, ActiveRecord.schema_format, nil)
        end

        seed = true
      end
    end
  end

  each_current_environment(env) do |environment|
    db_configs_with_versions(environment).sort.each do |version, db_configs|
      dump_db_configs |= db_configs

      db_configs.each do |db_config|
        with_temporary_pool(db_config) do
          migrate(version)
        end
      end
    end
  end

  # Dump schema for databases that were migrated.
  if ActiveRecord.dump_schema_after_migration
    dump_db_configs.each do |db_config|
      with_temporary_pool(db_config) do
        dump_schema(db_config)
      end
    end
  end

  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
352
 
# File 'lib/active_record/tasks/database_tasks.rb', line 348

def purge_current(environment = env)
  each_current_configuration(environment) { |db_config| purge(db_config) }

  migration_class.establish_connection(environment.to_sym)
end

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

:nodoc:



156
157
158
159
160
161
162
163
164
165
166
167
168
 
# File 'lib/active_record/tasks/database_tasks.rb', line 156

def raise_for_multi_db(environment = env, command:) # :nodoc:
  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:



404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
 
# File 'lib/active_record/tasks/database_tasks.rb', line 404

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

  with_temporary_pool(db_config, clobber: true) do
    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
end

#register_task(pattern, task) ⇒ Object 



73
74
75
76
 
# File 'lib/active_record/tasks/database_tasks.rb', line 73

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

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



446
447
448
449
450
451
452
453
454
455
456
457
 
# File 'lib/active_record/tasks/database_tasks.rb', line 446

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

Returns:

  • (Boolean) 


389
390
391
392
393
394
395
396
397
398
399
400
401
402
 
# File 'lib/active_record/tasks/database_tasks.rb', line 389

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)

  with_temporary_connection(db_config) do |connection|
    return false unless connection.internal_metadata.enabled?
    return false unless connection.internal_metadata.table_exists?

    connection.internal_metadata[:schema_sha1] == schema_sha1(file)
  end
end

#setup_initial_database_yaml ⇒ Object

:nodoc:



135
136
137
138
139
 
# File 'lib/active_record/tasks/database_tasks.rb', line 135

def setup_initial_database_yaml # :nodoc:
  return {} unless defined?(Rails)

  Rails.application.config.load_database_yaml
end

#structure_dump(configuration, *arguments) ⇒ Object 



354
355
356
357
358
359
 
# File 'lib/active_record/tasks/database_tasks.rb', line 354

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'
}



50
 
# File 'lib/active_record/tasks/database_tasks.rb', line 50

mattr_accessor :structure_dump_flags, instance_accessor: false

#structure_load(configuration, *arguments) ⇒ Object 



361
362
363
364
365
366
 
# File 'lib/active_record/tasks/database_tasks.rb', line 361

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)



56
 
# File 'lib/active_record/tasks/database_tasks.rb', line 56

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

#with_temporary_connection(db_config, clobber: false) ⇒ Object

:nodoc:



518
519
520
521
522
 
# File 'lib/active_record/tasks/database_tasks.rb', line 518

def with_temporary_connection(db_config, clobber: false) # :nodoc:
  with_temporary_pool(db_config, clobber: clobber) do |pool|
    yield pool.connection
  end
end

#with_temporary_connection_for_each(env: ActiveRecord::Tasks::DatabaseTasks.env, name: nil, clobber: false, &block) ⇒ Object

:nodoc:



507
508
509
510
511
512
513
514
515
516
 
# File 'lib/active_record/tasks/database_tasks.rb', line 507

def with_temporary_connection_for_each(env: ActiveRecord::Tasks::DatabaseTasks.env, name: nil, clobber: false, &block) # :nodoc:
  if name
    db_config = ActiveRecord::Base.configurations.configs_for(env_name: env, name: name)
    with_temporary_connection(db_config, clobber: clobber, &block)
  else
    ActiveRecord::Base.configurations.configs_for(env_name: env, name: name).each do |db_config|
      with_temporary_connection(db_config, clobber: clobber, &block)
    end
  end
end