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Added section to guide for validates with, which is scheduled for rai…

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1 parent 47a3701 commit ebd6ef3b36c2428723fae5d630f9ad6800f037c0 @zilkey zilkey committed Aug 9, 2009
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  1. +41 −0 railties/guides/source/activerecord_validations_callbacks.textile
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41 railties/guides/source/activerecord_validations_callbacks.textile
@@ -403,6 +403,47 @@ WARNING. Note that some databases are configured to perform case-insensitive sea
The default error message for +validates_uniqueness_of+ is "_has already been taken_".
+h4. +validates_with+
+
+This helper passes the record to a separate class for validation.
+
+<ruby>
+class Person < ActiveRecord::Base
+ validates_with GoodnessValidator
+end
+
+class GoodnessValidator < ActiveRecord::Validator
+ def validate
+ if record.first_name == "Evil"
+ record.errors[:base] << "This person is evil"
+ end
+ end
+end
+</ruby>
+
+The +validates_with+ helper takes a class, or a list of classes to use for validation. There is no default error message for +validates_with+. You must manually add errors to the record's errors collection in the validator class.
+
+The validator class has two attributes by default:
+
+* +record+ - the record to be validated
+* +options+ - the extra options that were passed to +validates_with+
+
+Like all other validations, +validates_with+ takes the +:if+, +:unless+ and +:on+ options. If you pass any other options, it will send those options to the validator class as +options+:
+
+<ruby>
+class Person < ActiveRecord::Base
+ validates_with GoodnessValidator, :fields => [:first_name, :last_name]
+end
+
+class GoodnessValidator < ActiveRecord::Validator
+ def validate
+ if options[:fields].any?{|field| record.send(field) == "Evil" }
+ record.errors[:base] << "This person is evil"
+ end
+ end
+end
+</ruby>
+
h4. +validates_each+
This helper validates attributes against a block. It doesn't have a predefined validation function. You should create one using a block, and every attribute passed to +validates_each+ will be tested against it. In the following example, we don't want names and surnames to begin with lower case.

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