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This class is used to verify that all migrations have been run before loading a web page if config.active_record.migration_error is set to :page_load

Methods
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N
Class Public methods
new(app, file_watcher: ActiveSupport::FileUpdateChecker)
# File activerecord/lib/active_record/migration.rb, line 579
def initialize(app, file_watcher: ActiveSupport::FileUpdateChecker)
  @app = app
  @needs_check = true
  @mutex = Mutex.new
  @file_watcher = file_watcher
end
Instance Public methods
call(env)
# File activerecord/lib/active_record/migration.rb, line 586
def call(env)
  @mutex.synchronize do
    @watcher ||= build_watcher do
      @needs_check = true
      ActiveRecord::Migration.check_pending!(connection)
      @needs_check = false
    end

    if @needs_check
      @watcher.execute
    else
      @watcher.execute_if_updated
    end
  end

  @app.call(env)
end