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class ActiveRecord::Migration::CheckPending

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.

Public class methods

new(app, file_watcher: ActiveSupport::FileUpdateChecker)

Source code GitHub 
# File activerecord/lib/active_record/migration.rb, line 652
def initialize(app, file_watcher: ActiveSupport::FileUpdateChecker)
  @app = app
  @needs_check = true
  @mutex = Mutex.new
  @file_watcher = file_watcher
end

Public instance methods

call(env)

Source code GitHub 
# File activerecord/lib/active_record/migration.rb, line 659
def call(env)
  @mutex.synchronize do
    @watcher ||= build_watcher do
      @needs_check = true
      ActiveRecord::Migration.check_pending_migrations
      @needs_check = false
    end

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

  @app.call(env)
end

Definition files