CODEWITHSUNDEEP
ruby-on-railsruby-on-rails-3
tessad
tessad

Reputation: 1219

Trying to delete from array - rails

I have an array of a user's favourite_guidelines. In my console it looks like this:

fg=User.first.favourite_guidelines
  User Load (73.9ms)  SELECT "users".* FROM "users" LIMIT 1
  FavouriteGuideline Load (0.2ms)  SELECT "favourite_guidelines".* FROM "favourite_guidelines" WHERE "favourite_guidelines"."user_id" = 11
 => [#<FavouriteGuideline id: 16, guideline_id: 24, user_id: 11, created_at: "2013-02-17 01:03:19", updated_at: "2013-02-17 01:03:19">, #<FavouriteGuideline id: 18, guideline_id: 23, user_id: 11, created_at: "2013-02-17 11:40:27", updated_at: "2013-02-17 11:40:27">]

So it contains two guidelines. I would like to be able to delete a value of a certain guideline_id so that the user's favourite guidelines would have that favourite removed. At the moment I have:

User.first,favourite_guidelines.delete_if{|favourite| favourite["guideline_id"] == 24}

That gives me:

.9.3p194 :066 > User.first.favourite_guidelines.delete_if{|favourite| favourite["guideline_id"] == 24}
  User Load (0.4ms)  SELECT "users".* FROM "users" LIMIT 1
  FavouriteGuideline Load (0.3ms)  SELECT "favourite_guidelines".* FROM "favourite_guidelines" WHERE "favourite_guidelines"."user_id" = 11
 => [#<FavouriteGuideline id: 18, guideline_id: 23, user_id: 11, created_at: "2013-02-17 11:40:27", updated_at: "2013-02-17 11:40:27">]'

So it looks like it is deleteing it but it's obviously not saving because then if I do:

    1.9.3p194 :067 > User.first.favourite_guidelines
  User Load (0.4ms)  SELECT "users".* FROM "users" LIMIT 1
  FavouriteGuideline Load (0.4ms)  SELECT "favourite_guidelines".* FROM "favourite_guidelines" WHERE "favourite_guidelines"."user_id" = 11
 => [#<FavouriteGuideline id: 16, guideline_id: 24, user_id: 11, created_at: "2013-02-17 01:03:19", updated_at: "2013-02-17 01:03:19">, #<FavouriteGuideline id: 18, guideline_id: 23, user_id: 11, created_at: "2013-02-17 11:40:27", updated_at: "2013-02-17 11:40:27">]

What am I doing wrong?

Upvotes: 1

Views: 144

Answers (2)

Aleksei Chernenkov
Aleksei Chernenkov

Reputation: 1051

delete_if works on Array of returned records but not on database. Try:

User.first.favourite_guidelines.where(guideline_id: 24).destroy_all

PS. Also you could look here

Upvotes: 1

Rahul Tapali
Rahul Tapali

Reputation: 10137

Try this:

   User.first.favourite_guidelines.destroy( :guideline_id => 24)

Or

  User.first.favourite_guidelines.where( :guideline_id => 24).destroy_all

Upvotes: 1

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