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authorMatilda Smeds <matildasmeds@users.noreply.github.com>2018-12-09 18:28:00 +0100
committerGitHub <noreply@github.com>2018-12-09 18:28:00 +0100
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Merge branch 'master' into guides_session_guidelines_2
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@@ -538,7 +538,8 @@ end
If you want to be sure that an association is present, you'll need to test
whether the associated object itself is present, and not the foreign key used
-to map the association.
+to map the association. This way, it is not only checked that the foreign key
+is not empty but also that the referenced object exists.
```ruby
class LineItem < ApplicationRecord