123456789_123456789_123456789_123456789_123456789_

Class: ActiveRecord::Promise

Relationships & Source Files
Extension / Inclusion / Inheritance Descendants
Subclasses:
ActiveRecord::Promise::Complete
Inherits: BasicObject
Defined in: activerecord/lib/active_record/promise.rb

Instance Attribute Summary

Instance Method Summary

  • #then(&block)

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

  • #value

    Returns the query result.

Instance Attribute Details

#pending? ⇒ Boolean (readonly)

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

[ GitHub ] 

  


# File 'activerecord/lib/active_record/promise.rb', line 13



def pending?
  @future_result.pending?
end


  







Instance Method Details



  

    #then(&block)  
  



  

    

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



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


  



  [ GitHub ]


  

  


# 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.


  



  [ GitHub ]


  

  


# 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