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Adding a note about :inverse_of for validations.

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1 parent cfd324b commit 1ce99553d0dc7c84a9cade9faec8993de0ac6d88 @steveklabnik steveklabnik committed Nov 27, 2012
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  1. +8 −0 guides/source/active_record_validations_callbacks.md
@@ -381,6 +381,14 @@ class LineItem < ActiveRecord::Base
end
```
+You should also be sure to have a proper `:inverse_of` as well:
+
+```ruby
+class Order < ActiveRecord::Base
+ has_many :line_items, inverse_of: :order
+end
+```
+
If you validate the presence of an object associated via a `has_one` or `has_many` relationship, it will check that the object is neither `blank?` nor `marked_for_destruction?`.
Since `false.blank?` is true, if you want to validate the presence of a boolean field you should use `validates :field_name, inclusion: { in: [true, false] }`.

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