以前は問題なく動作していました。私は少し設定を遊んでいます。知らないうちにいくつかの設定を変更した可能性があります。
ここにenvironment / development.rbの設定があります
config.cache_classes = false
# Log error messages when you accidentally call methods on nil.
config.whiny_nils = true
# Show full error reports and disable caching
config.consider_all_requests_local = true
config.action_view.debug_rjs = true
config.action_controller.perform_caching = false
# Don't care if the mailer can't send
config.action_mailer.raise_delivery_errors = false
# Print deprecation notices to the Rails logger
config.active_support.deprecation = :log
# Only use best-standards-support built into browsers
config.action_dispatch.best_standards_support = :builtin
# migration prefix with sequence #s
config.active_record.timestamped_migrations = false
#time zone
config.time_zone = 'UTC'
ここにapplication.rbのconfigセクションがあります
# Configure the default encoding used in templates for Ruby 1.9.
config.encoding = "utf-8"
# Configure sensitive parameters which will be filtered from the log file.
config.filter_parameters += [:password]
config.active_record.schema_format = :sql
リロードを実行すると!Railsコンソールではtrueを返します