Class: ActiveRecord::Migration::CheckPending

Inherits:
Object
  • Object
show all
Defined in:
activerecord/lib/active_record/migration.rb

Overview

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

Instance Method Summary collapse

Constructor Details

#initialize(app, file_watcher: ActiveSupport::FileUpdateChecker) ⇒ CheckPending

Returns a new instance of CheckPending.


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# File 'activerecord/lib/active_record/migration.rb', line 552

def initialize(app, file_watcher: ActiveSupport::FileUpdateChecker)
  @app = app
  @needs_check = true
  @mutex = Mutex.new
  @file_watcher = file_watcher
end

Instance Method Details

#call(env) ⇒ Object


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# File 'activerecord/lib/active_record/migration.rb', line 559

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