class ActiveRecord::Promise

Public Instance Methods

pending? ()

Returns whether the associated query is still being executed or not.

# File activerecord/lib/active_record/promise.rb, line 13
def pending?
  @future_result.pending?
end
then (&block)

Returns a new ActiveRecord::Promise that will apply the passed block when the value is accessed:

Post.async_pick(:title).then { |title| title.upcase }.value
# => "POST TITLE"

# File activerecord/lib/active_record/promise.rb, line 36
def then(&block)
  Promise.new(@future_result, @block ? @block >> block : block)
end
value ()

Returns the query result. If the query wasn’t completed yet, accessing value will block until the query completes. If the query failed, value will raise the corresponding error.

# File activerecord/lib/active_record/promise.rb, line 20
def value
  return @value if defined? @value

  result = @future_result.result
  @value = if @block
    @block.call(result)
  else
    result
  end
end