Comments on: How to delete a many-to-many association with Rails http://neyric.com/2007/07/08/how-to-delete-a-many-to-many-association-with-rails/ projects, programming, blogging... Tue, 27 Dec 2011 00:01:48 +0000 hourly 1 http://wordpress.org/?v=3.0.1 By: Ruby on Rails, why foreign keys matter « Il connettivo http://neyric.com/2007/07/08/how-to-delete-a-many-to-many-association-with-rails/#comment-391 Ruby on Rails, why foreign keys matter « Il connettivo Fri, 12 Aug 2011 13:13:40 +0000 http://how-to-delete-a-many-to-many-association-with-rails#comment-391 [...] to delete a object in that kind of association follow the instructions in this post. In short: post.authors.clear (which deletes the association) and post.delete [...] [...] to delete a object in that kind of association follow the instructions in this post. In short: post.authors.clear (which deletes the association) and post.delete [...]

]]> By: di97msgd http://neyric.com/2007/07/08/how-to-delete-a-many-to-many-association-with-rails/#comment-16 di97msgd Thu, 12 Aug 2010 09:06:09 +0000 http://how-to-delete-a-many-to-many-association-with-rails#comment-16 matt. :dependent => :destroy is not a valid option for has_and_belongs_to_many that this article was about. matt.
:dependent => :destroy is not a valid option for has_and_belongs_to_many that this article was about.

]]> By: Thomas Glasgow http://neyric.com/2007/07/08/how-to-delete-a-many-to-many-association-with-rails/#comment-14 Thomas Glasgow Mon, 08 Mar 2010 21:19:06 +0000 http://how-to-delete-a-many-to-many-association-with-rails#comment-14 Thank you for the tip, I was just wondering how to remove associations. Cheers, Thank you for the tip, I was just wondering how to remove associations.

Cheers,

]]> By: matt http://neyric.com/2007/07/08/how-to-delete-a-many-to-many-association-with-rails/#comment-13 matt Fri, 05 Mar 2010 07:19:32 +0000 http://how-to-delete-a-many-to-many-association-with-rails#comment-13 Thanks for the post - deleting associations is also not made very clear by the rails API. @remkade -- just to add that before_destroy { |post| <a href="post.categories.destr" rel="nofollow">post.categories.destr</a>oy_all} isn't really necessary if you use the :dependent option when you first associate the objects. Like so: has_many :feed_entries, :dependent => :destroy # which will destroy all associated objects whenever the feed itself is destroyed. :dependent also has a bunch of options besides destroy. Thanks for the post – deleting associations is also not made very clear by the rails API.

@remkade — just to add that before_destroy { |post| post.categories.destroy_all} isn’t really necessary if you use the :dependent option when you first associate the objects.

Like so:

has_many :feed_entries, :dependent => :destroy # which will destroy all associated objects whenever the feed itself is destroyed.

:dependent also has a bunch of options besides destroy.

]]> By: remkade http://neyric.com/2007/07/08/how-to-delete-a-many-to-many-association-with-rails/#comment-12 remkade Fri, 26 Jun 2009 21:38:19 +0000 http://how-to-delete-a-many-to-many-association-with-rails#comment-12 You can also do this in your model: before_destroy { |post| <a href="post.categories.destr" rel="nofollow">post.categories.destr</a>oy_all } Which is much easier I think. You can also do this in your model:

before_destroy { |post| post.categories.destroy_all }

Which is much easier I think.

]]> By: Jorgegorka http://neyric.com/2007/07/08/how-to-delete-a-many-to-many-association-with-rails/#comment-11 Jorgegorka Sat, 02 Aug 2008 13:08:34 +0000 http://how-to-delete-a-many-to-many-association-with-rails#comment-11 Indeed, it's an important subject that has been sistematically ommited in what should be The Book about rails: Agile web development with rails. Thank you very much for the post and the clear explanation. Indeed, it’s an important subject that has been sistematically ommited in what should be The Book about rails: Agile web development with rails.

Thank you very much for the post and the clear explanation.

]]> By: Zoran http://neyric.com/2007/07/08/how-to-delete-a-many-to-many-association-with-rails/#comment-10 Zoran Tue, 08 Apr 2008 22:02:06 +0000 http://how-to-delete-a-many-to-many-association-with-rails#comment-10 Thank you so much for this! Thank you so much for this!

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