Setting config.amount_column.postfix breaks migrations

[paddy-hack]

I started a brand, new Rails (8.0.2, Ruby 3.4.4) application, added the money-rails gem and set up the following initializer

MoneyRails.configure do |config|
  config.amount_column = { postfix: "_cents" }
end

Yes, I know _cents is the default but the actual postfix value does not matter.

Next, I generate a Price model with

bin/rails generate model Price price:integer           # money and monetize do not work :-(

and fix up the migration with

sed 's/integer/monetize/' db/migrate/*.rb

before running

bin/rails db:migrate --trace

That results in

** Invoke db:migrate (first_time)
** Invoke db:load_config (first_time)
** Invoke environment (first_time)
** Execute environment
** Execute db:load_config
** Execute db:migrate
bin/rails aborted!
StandardError: An error has occurred, this and all later migrations canceled: (StandardError)

wrong number of arguments (given 0, expected 2)
/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/connection_adapters/abstract/schema_definitions.rb:492:in 'column'
/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/money-rails-1.15.0/lib/money-rails/active_record/migration_extensions/table_pg_rails4.rb:9:in 'block in MoneyRails::ActiveRecord::MigrationExtensions::Table#monetize'
[...]
bin/rails:4:in '<main>'
Tasks: TOP => db:migrate
== 20250525041956 CreatePrices: migrating =====================================
-- create_table(:prices)

Output of bin/rails db:migrate --trace

** Invoke db:migrate (first_time)
** Invoke db:load_config (first_time)
** Invoke environment (first_time)
** Execute environment
** Execute db:load_config
** Execute db:migrate
bin/rails aborted!
StandardError: An error has occurred, this and all later migrations canceled: (StandardError)
wrong number of arguments (given 0, expected 2)

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/connection_adapters/abstract/schema_definitions.rb:492:in 'column'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/money-rails-1.15.0/lib/money-rails/active_record/migration_extensions/table_pg_rails4.rb:9:in 'block in MoneyRails::ActiveRecord::MigrationExtensions::Table#monetize'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/money-rails-1.15.0/lib/money-rails/active_record/migration_extensions/table_pg_rails4.rb:6:in 'Array#each'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/money-rails-1.15.0/lib/money-rails/active_record/migration_extensions/table_pg_rails4.rb:6:in 'MoneyRails::ActiveRecord::MigrationExtensions::Table#monetize'

/path/to/application/code/db/migrate/20250525041956_create_prices.rb:4:in 'block in CreatePrices#change'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/migration.rb:582:in 'block in ActiveRecord::Migration::Current#create_table'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/connection_adapters/abstract/schema_statements.rb:337:in 'ActiveRecord::ConnectionAdapters::SchemaStatements#build_create_table_definition'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/connection_adapters/abstract/schema_statements.rb:301:in 'ActiveRecord::ConnectionAdapters::SchemaStatements#create_table'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/migration/default_strategy.rb:10:in 'ActiveRecord::Migration::DefaultStrategy#method_missing'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/migration.rb:1056:in 'block in ActiveRecord::Migration#method_missing'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/migration.rb:1022:in 'block in ActiveRecord::Migration#say_with_time'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activesupport-8.0.2/lib/active_support/benchmark.rb:17:in 'ActiveSupport::Benchmark.realtime'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/migration.rb:1022:in 'ActiveRecord::Migration#say_with_time'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/migration.rb:1045:in 'ActiveRecord::Migration#method_missing'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/migration.rb:582:in 'ActiveRecord::Migration::Current#create_table'

/path/to/application/code/db/migrate/20250525041956_create_prices.rb:3:in 'CreatePrices#change'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/migration.rb:991:in 'ActiveRecord::Migration#exec_migration'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/migration.rb:975:in 'block (2 levels) in ActiveRecord::Migration#migrate'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activesupport-8.0.2/lib/active_support/benchmark.rb:17:in 'ActiveSupport::Benchmark.realtime'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/migration.rb:974:in 'block in ActiveRecord::Migration#migrate'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/connection_adapters/abstract/connection_pool.rb:412:in 'ActiveRecord::ConnectionAdapters::ConnectionPool#with_connection'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/migration.rb:973:in 'ActiveRecord::Migration#migrate'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/migration.rb:1187:in 'ActiveRecord::MigrationProxy#migrate'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/migration.rb:1535:in 'block in ActiveRecord::Migrator#execute_migration_in_transaction'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/connection_adapters/abstract/transaction.rb:626:in 'block in ActiveRecord::ConnectionAdapters::TransactionManager#within_new_transaction'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activesupport-8.0.2/lib/active_support/concurrency/null_lock.rb:9:in 'ActiveSupport::Concurrency::NullLock#synchronize'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/connection_adapters/abstract/transaction.rb:623:in 'ActiveRecord::ConnectionAdapters::TransactionManager#within_new_transaction'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/connection_adapters/abstract/database_statements.rb:367:in 'ActiveRecord::ConnectionAdapters::DatabaseStatements#within_new_transaction'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/connection_adapters/abstract/database_statements.rb:359:in 'ActiveRecord::ConnectionAdapters::DatabaseStatements#transaction'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/migration.rb:1586:in 'ActiveRecord::Migrator#ddl_transaction'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/migration.rb:1534:in 'ActiveRecord::Migrator#execute_migration_in_transaction'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/migration.rb:1509:in 'Array#each'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/migration.rb:1509:in 'ActiveRecord::Migrator#migrate_without_lock'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/migration.rb:1456:in 'ActiveRecord::Migrator#migrate'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/migration.rb:1261:in 'ActiveRecord::MigrationContext#up'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/migration.rb:1236:in 'ActiveRecord::MigrationContext#migrate'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/tasks/database_tasks.rb:270:in 'ActiveRecord::Tasks::DatabaseTasks#migrate'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/tasks/database_tasks.rb:248:in 'ActiveRecord::Tasks::DatabaseTasks#migrate_all'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/railties/databases.rake:90:in 'block (2 levels) in 
'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/rake-13.2.1/lib/rake/task.rb:281:in 'block in Rake::Task#execute'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/rake-13.2.1/lib/rake/task.rb:281:in 'Array#each'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/rake-13.2.1/lib/rake/task.rb:281:in 'Rake::Task#execute'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/rake-13.2.1/lib/rake/task.rb:219:in 'block in Rake::Task#invoke_with_call_chain'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/rake-13.2.1/lib/rake/task.rb:199:in 'Monitor#synchronize'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/rake-13.2.1/lib/rake/task.rb:199:in 'Rake::Task#invoke_with_call_chain'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/rake-13.2.1/lib/rake/task.rb:188:in 'Rake::Task#invoke'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/rake-13.2.1/lib/rake/application.rb:188:in 'Rake::Application#invoke_task'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/rake-13.2.1/lib/rake/application.rb:138:in 'block (2 levels) in Rake::Application#top_level'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/rake-13.2.1/lib/rake/application.rb:138:in 'Array#each'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/rake-13.2.1/lib/rake/application.rb:138:in 'block in Rake::Application#top_level'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/rake-13.2.1/lib/rake/application.rb:147:in 'Rake::Application#run_with_threads'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/rake-13.2.1/lib/rake/application.rb:132:in 'Rake::Application#top_level'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/railties-8.0.2/lib/rails/commands/rake/rake_command.rb:27:in 'block (2 levels) in Rails::Command::RakeCommand.perform'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/rake-13.2.1/lib/rake/application.rb:214:in 'Rake::Application#standard_exception_handling'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/railties-8.0.2/lib/rails/commands/rake/rake_command.rb:27:in 'block in Rails::Command::RakeCommand.perform'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/railties-8.0.2/lib/rails/commands/rake/rake_command.rb:44:in 'block in Rails::Command::RakeCommand.with_rake'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/rake-13.2.1/lib/rake/rake_module.rb:59:in 'Rake.with_application'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/railties-8.0.2/lib/rails/commands/rake/rake_command.rb:41:in 'Rails::Command::RakeCommand.with_rake'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/railties-8.0.2/lib/rails/commands/rake/rake_command.rb:20:in 'Rails::Command::RakeCommand.perform'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/railties-8.0.2/lib/rails/command.rb:150:in 'Rails::Command.invoke_rake'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/railties-8.0.2/lib/rails/command.rb:67:in 'block in Rails::Command.invoke'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/railties-8.0.2/lib/rails/command.rb:143:in 'Rails::Command.with_argv'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/railties-8.0.2/lib/rails/command.rb:63:in 'Rails::Command.invoke'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/railties-8.0.2/lib/rails/commands.rb:18:in ''

/path/to/ruby/3.4.4/lib/ruby/3.4.0/bundled_gems.rb:82:in 'Kernel.require'

/path/to/ruby/3.4.4/lib/ruby/3.4.0/bundled_gems.rb:82:in 'block (2 levels) in Kernel#replace_require'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/bootsnap-1.18.6/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:30:in 'Kernel#require'

bin/rails:4:in ''

Caused by:

ArgumentError: wrong number of arguments (given 0, expected 2) (ArgumentError)

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/connection_adapters/abstract/schema_definitions.rb:492:in 'column'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/money-rails-1.15.0/lib/money-rails/active_record/migration_extensions/table_pg_rails4.rb:9:in 'block in MoneyRails::ActiveRecord::MigrationExtensions::Table#monetize'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/money-rails-1.15.0/lib/money-rails/active_record/migration_extensions/table_pg_rails4.rb:6:in 'Array#each'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/money-rails-1.15.0/lib/money-rails/active_record/migration_extensions/table_pg_rails4.rb:6:in 'MoneyRails::ActiveRecord::MigrationExtensions::Table#monetize'

/path/to/application/code/db/migrate/20250525041956_create_prices.rb:4:in 'block in CreatePrices#change'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/migration.rb:582:in 'block in ActiveRecord::Migration::Current#create_table'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/connection_adapters/abstract/schema_statements.rb:337:in 'ActiveRecord::ConnectionAdapters::SchemaStatements#build_create_table_definition'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/connection_adapters/abstract/schema_statements.rb:301:in 'ActiveRecord::ConnectionAdapters::SchemaStatements#create_table'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/migration/default_strategy.rb:10:in 'ActiveRecord::Migration::DefaultStrategy#method_missing'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/migration.rb:1056:in 'block in ActiveRecord::Migration#method_missing'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/migration.rb:1022:in 'block in ActiveRecord::Migration#say_with_time'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activesupport-8.0.2/lib/active_support/benchmark.rb:17:in 'ActiveSupport::Benchmark.realtime'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/migration.rb:1022:in 'ActiveRecord::Migration#say_with_time'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/migration.rb:1045:in 'ActiveRecord::Migration#method_missing'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/migration.rb:582:in 'ActiveRecord::Migration::Current#create_table'

/path/to/application/code/db/migrate/20250525041956_create_prices.rb:3:in 'CreatePrices#change'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/migration.rb:991:in 'ActiveRecord::Migration#exec_migration'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/migration.rb:975:in 'block (2 levels) in ActiveRecord::Migration#migrate'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activesupport-8.0.2/lib/active_support/benchmark.rb:17:in 'ActiveSupport::Benchmark.realtime'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/migration.rb:974:in 'block in ActiveRecord::Migration#migrate'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/connection_adapters/abstract/connection_pool.rb:412:in 'ActiveRecord::ConnectionAdapters::ConnectionPool#with_connection'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/migration.rb:973:in 'ActiveRecord::Migration#migrate'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/migration.rb:1187:in 'ActiveRecord::MigrationProxy#migrate'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/migration.rb:1535:in 'block in ActiveRecord::Migrator#execute_migration_in_transaction'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/connection_adapters/abstract/transaction.rb:626:in 'block in ActiveRecord::ConnectionAdapters::TransactionManager#within_new_transaction'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activesupport-8.0.2/lib/active_support/concurrency/null_lock.rb:9:in 'ActiveSupport::Concurrency::NullLock#synchronize'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/connection_adapters/abstract/transaction.rb:623:in 'ActiveRecord::ConnectionAdapters::TransactionManager#within_new_transaction'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/connection_adapters/abstract/database_statements.rb:367:in 'ActiveRecord::ConnectionAdapters::DatabaseStatements#within_new_transaction'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/connection_adapters/abstract/database_statements.rb:359:in 'ActiveRecord::ConnectionAdapters::DatabaseStatements#transaction'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/migration.rb:1586:in 'ActiveRecord::Migrator#ddl_transaction'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/migration.rb:1534:in 'ActiveRecord::Migrator#execute_migration_in_transaction'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/migration.rb:1509:in 'Array#each'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/migration.rb:1509:in 'ActiveRecord::Migrator#migrate_without_lock'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/migration.rb:1456:in 'ActiveRecord::Migrator#migrate'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/migration.rb:1261:in 'ActiveRecord::MigrationContext#up'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/migration.rb:1236:in 'ActiveRecord::MigrationContext#migrate'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/tasks/database_tasks.rb:270:in 'ActiveRecord::Tasks::DatabaseTasks#migrate'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/tasks/database_tasks.rb:248:in 'ActiveRecord::Tasks::DatabaseTasks#migrate_all'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/railties/databases.rake:90:in 'block (2 levels) in 
'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/rake-13.2.1/lib/rake/task.rb:281:in 'block in Rake::Task#execute'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/rake-13.2.1/lib/rake/task.rb:281:in 'Array#each'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/rake-13.2.1/lib/rake/task.rb:281:in 'Rake::Task#execute'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/rake-13.2.1/lib/rake/task.rb:219:in 'block in Rake::Task#invoke_with_call_chain'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/rake-13.2.1/lib/rake/task.rb:199:in 'Monitor#synchronize'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/rake-13.2.1/lib/rake/task.rb:199:in 'Rake::Task#invoke_with_call_chain'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/rake-13.2.1/lib/rake/task.rb:188:in 'Rake::Task#invoke'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/rake-13.2.1/lib/rake/application.rb:188:in 'Rake::Application#invoke_task'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/rake-13.2.1/lib/rake/application.rb:138:in 'block (2 levels) in Rake::Application#top_level'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/rake-13.2.1/lib/rake/application.rb:138:in 'Array#each'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/rake-13.2.1/lib/rake/application.rb:138:in 'block in Rake::Application#top_level'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/rake-13.2.1/lib/rake/application.rb:147:in 'Rake::Application#run_with_threads'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/rake-13.2.1/lib/rake/application.rb:132:in 'Rake::Application#top_level'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/railties-8.0.2/lib/rails/commands/rake/rake_command.rb:27:in 'block (2 levels) in Rails::Command::RakeCommand.perform'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/rake-13.2.1/lib/rake/application.rb:214:in 'Rake::Application#standard_exception_handling'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/railties-8.0.2/lib/rails/commands/rake/rake_command.rb:27:in 'block in Rails::Command::RakeCommand.perform'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/railties-8.0.2/lib/rails/commands/rake/rake_command.rb:44:in 'block in Rails::Command::RakeCommand.with_rake'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/rake-13.2.1/lib/rake/rake_module.rb:59:in 'Rake.with_application'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/railties-8.0.2/lib/rails/commands/rake/rake_command.rb:41:in 'Rails::Command::RakeCommand.with_rake'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/railties-8.0.2/lib/rails/commands/rake/rake_command.rb:20:in 'Rails::Command::RakeCommand.perform'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/railties-8.0.2/lib/rails/command.rb:150:in 'Rails::Command.invoke_rake'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/railties-8.0.2/lib/rails/command.rb:67:in 'block in Rails::Command.invoke'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/railties-8.0.2/lib/rails/command.rb:143:in 'Rails::Command.with_argv'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/railties-8.0.2/lib/rails/command.rb:63:in 'Rails::Command.invoke'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/railties-8.0.2/lib/rails/commands.rb:18:in ''

/path/to/ruby/3.4.4/lib/ruby/3.4.0/bundled_gems.rb:82:in 'Kernel.require'

/path/to/ruby/3.4.4/lib/ruby/3.4.0/bundled_gems.rb:82:in 'block (2 levels) in Kernel#replace_require'

/path/to/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/bootsnap-1.18.6/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:30:in 'Kernel#require'

bin/rails:4:in ''

Tasks: TOP => db:migrate

== 20250525041956 CreatePrices: migrating =====================================

-- create_table(:prices)

Workaround

Removing the initializer and changing the t.monetize line in the migration to

    t.monetize :price, amount: { postfix: '_cents' }

works around the issue.

Possibly related: #612

[paddy-hack]

Actually, the postfix value does seem to matter. When I try the above with a currency-neutral _subunits, the migration works but trying to instantiate Price objects gives

$ bin/rails console
Loading development environment (Rails 8.0.2)
subunits(dev)> p = Price.new
app/models/price.rb:2:in '<class:Price>': Unable to infer the name of the monetizable attribute for 'price_subunits'. Expected amount column postfix is '_cents'. Use :as option to explicitly specify the name or change the amount column postfix in the initializer. (ArgumentError)

              raise ArgumentError, "Unable to infer the name of the monetizable attribute for '#{subunit_name}'. " \
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
	from app/models/price.rb:1:in '<main>'
	from (subunits):1:in '<main>'

That needs to be worked around with

class Price < ApplicationRecord
  monetize :price_subunits, as: "price"
end

and I also needed to fix up the test fixtures to use price_subunits instead of price attributes.

I had expected the config.amount_column.postfix setting to let me get away with just

t.monetize :price

in the migration and

monetize :price_subunits      # even better just a simple monetize :price

in the class definition. I guess that was naive ... 🤔

[paddy-hack]

Finally figured out where I was going wrong 🤦
I should have used

config.amount_column.merge! postfix: "_subunits"

in config/initializers/money.rb so as to not clobber any of the other hash attributes.

With that I no longer need the workaround in the migration.

I still need the workaround in the model though.