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Add a note to discourage users from using presence validators with al…

…low_(nil|blank)
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1 parent 9798ee2 commit e05e9979075b37342b7c88e557dbffd672b2086a @jeffkreeftmeijer jeffkreeftmeijer committed Mar 9, 2011
Showing with 3 additions and 1 deletion.
  1. +3 −1 railties/guides/source/active_record_validations_callbacks.textile
@@ -463,9 +463,11 @@ h3. Common Validation Options
There are some common options that all the validation helpers can use. Here they are, except for the +:if+ and +:unless+ options, which are discussed later in "Conditional Validation":#conditional-validation.
+TIP: Note that +allow_nil+ and +allow_blank+ will be ignored when using the presence validator. Please use the length validator if you want to validate if something is a specific length but allows for +nil+ values.
+
h4. +:allow_nil+
-The +:allow_nil+ option skips the validation when the value being validated is +nil+. Using +:allow_nil+ with +validates_presence_of+ allows for +nil+, but any other +blank?+ value will still be rejected.
+The +:allow_nil+ option skips the validation when the value being validated is +nil+.
<ruby>
class Coffee < ActiveRecord::Base

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