CODEWITHSUNDEEP
ruby-on-railsassociationshas-and-belongs-to-many
bdx
bdx

Reputation: 3516

Rails - HABTM association, checking exists? of any object in array

I want to check the existence of any HABTM relationships in an array and return true if any exist.

At present, the only way I can see to do this is:

result = false
[1,2,3,4].each do |i|
  if user.parents.exists?(i)
    result = true
    break
  end
end

I tried passing in an array as follows, but I get an exception

result = true if user.parents.exists?([1,2,3,4])

NoMethodError: undefined method `include?` for 1:Fixnum

Is there a better way of doing this?

Upvotes: 3

Views: 2191

Answers (1)

Erez Rabih
Erez Rabih

Reputation: 15788

[1,2,3,4].inject(false) {|res, i| res ||= user.parents.exists?(i)}

Pretty much the same logic, just more ruby-ish code using inject syntax.

UPDATE:

Haven't tested it. but this might also work:

user.parents.exists?(:id => [1,2,3,4])

Upvotes: 4

Related Questions