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Rails - validates_unlike plugin : validate that an attribute doesn’t match against a RegExp

Publicado por Edgar González 11 Julio 2006 en Rails, Ruby. english • español

Working in rubycorner.com, I found myself needing to validate that a model attribute didn't match against some RegExp.

My first approach was to define a validate method in my model:

RUBY:

def validate
if my_field =~ /html|http|onclick|onmouseover/
errors.add("my_field", "should not contain html, http, onclick or onmouseover.")
end
end

But this approach is not DRY, so I create a new method: validates_unlike, which just validates that an attribute value doesn't match against the RegExp provided (just like validates_format_of, but with a negated condition), the code is:

PLAIN TEXT

RUBY:

module ActiveRecord
module Validations
module ClassMethods
def validates_unlike(*attr_names)
configuration = { :message => ActiveRecord::Errors.default_error_messages[:invalid], :on => :save, :with => nil }
configuration.update(attr_names.pop) if attr_names.last.is_a?(Hash)
raise(ArgumentError, "A regular expression must be supplied as the :with option of the configuration hash") unless configuration[:with].is_a?(Regexp)
validates_each(attr_names, configuration) do |record, attr_name, value|
record.errors.add(attr_name, configuration[:message]) if value.to_s =~ configuration[:with]
end
end
end
end
end

This code is available as a rails plugin: validates_unlike-0.1.zip

3 Respuestas a “Rails - validates_unlike plugin : validate that an attribute doesn’t match against a RegExp”

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1 Sam 6 Ago, 2007 a 12:05 am

Thanks for this plug-in. It's hard to believe there isn't something like this in core.
2 Sam 6 Jun, 2008 a 9:09 am

Edgar, I hope you don't mind but I put a fork of validates_unlike up on GitHub.

The URL is http://github.com/sschroed/validates_unlike

I can remove it if you like but I find this to be useful so I thought I'd expose it to more people on GitHub.
3 Edgar 6 Jun, 2008 a 2:23 pm

Thanks Sam !