Trying to delete from array - rails

Question

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?

you are deleting from array not from table..

Rahul Tapali
– Rahul Tapali

2013-02-17 11:56:10 +00:00
Commented Feb 17, 2013 at 11:56 — Rahul Tapali
– Rahul Tapali, Commented Feb 17, 2013 at 11:56

Rahul Tapali · Accepted Answer · 2013-02-17 12:02:15Z

1

Try this:

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

Or

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

answered Feb 17, 2013 at 12:02

Rahul Tapali

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Comments

Community · Accepted Answer · 2017-05-23 12:04:50Z

1

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

edited May 23, 2017 at 12:04

CommunityBot

11 silver badge

answered Feb 17, 2013 at 11:54

Aleksei Chernenkov

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4 Comments

tessad Over a year ago

yes - that's it! Is there a way to pass something other than the id though (i.e. I want to pass the guideline_id but this takes the favourite_guideline_id)

Aleksei Chernenkov Over a year ago

Yes. See the link added. You can destroy_all(some_field: some_value)

tessad Over a year ago

Yes!!! I love you. Thank you. User.first.favourite_guidelines.where(:guideline_id => 24).destroy_all

Rahul Tapali Over a year ago

This is wrong. It will delete favourite_guideline with id 24 not with guide_line_id 24

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