Is it possible to use validates_exclusion_of with regular expressions?
That would ensure that URLs matching these specific patterns can't be validated nor inserted into db.
What would be the best approach to code this?
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2 Answers
There are a couple ways I might do it, depending on the circumstance.
First, if I am going to have to match some patterns and then exclude others I might do something like this:
validates_format_of :url, :with => /swanky pattern/, :unless => :beavis
def beavis
self.url.match(/beavis/)
end
Or if you just need to exclude certain patterns
validate :i_hate_beavis
def i_hate_beavis
errors.add(:url, 'cannot be beavis') if self.url.match(/beavis/)
end
resources: http://apidock.com/rails/ActiveModel/Validations/ClassMethods/validate
1 Comment
Arnaud Leymet
I chose your solution and adapted it. Works great.
I took Geoff's approach and implemented the following:
validate :url_is_acceptable
URL_BLACKLIST = [
/http:\/\/www.some-website.com\/.*/,
/http:\/\/www.other-website.com\/.*/
]
def url_is_acceptable
URL_BLACKLIST.each do |blacklisted_url|
if self.url =~ blacklisted_url
errors.add(:not_acceptable, "is not acceptable")
return
end
end
end