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Not saved children does not have parent object in has many association

#5118

We have got 2 objects in has_many relation

class User
 has_many :movies
end
class Movie
 belongs_to :user
end

If you create a parent object and the children then you have not access to parent object from children until you saved it.

user = User.new
movie = Movie.new
user.movies << movie

user.movies
>> [#<Movie id: nil>]
movie.user
>> nil

In my opinion children should always have information about its parent. It can be usefull if you need this information to prepare object before saving(or in validations).

Reported by Staszek · July 15th, 2010 @ 10:58 AM

Activity

Staszek
- Tag changed from associations, association_collection, belongs_to, hasmany to 2.x, associations, association_collection, belongs_to, hasmany
July 15th, 2010 @ 10:59 AM

Subba

you should try using inverse_of option as shown below.

class User
 has_many :movies, :inverse_of => :user
end
class Movie
 belongs_to :user, :inverse_of => :movies
end

July 15th, 2010 @ 12:50 PM

Staszek
Thank you. It looks like after #3533 Backport :inverse_of from 3.0 to 2.3.x documentation should be updated. Rdocs for 2.3.8 does not have any information about this option

July 15th, 2010 @ 01:16 PM
Neeraj Singh
- State changed from new to resolved
- Importance changed from to Low
July 15th, 2010 @ 01:41 PM