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POConditional validation on model dependent on value of model attribute
 

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    <p>I'm struggling with validating a postal_code and using a different regex depending on what the country_code attribute is. I tried the following, but it does not work:</p> <pre><code>class Venue &lt; ActiveRecord::Base ... attr_accessible :postal_code attr_accessible :country_code ... validates_presence_of :country_code validates_length_of :country_code, :maximum =&gt; 2, :allow_nil =&gt; true validates_inclusion_of :country_code, :in =&gt; %w( US CA AU GB ) validates_presence_of :postal_code validates_length_of :postal_code, :maximum =&gt; 10, :allow_nil =&gt; true validates_format_of :postal_code, :with =&gt; %r{^\d{4}$}, :message =&gt; "should be in the format 1111", :allow_nil =&gt; true, :if =&gt; :country_code == 'AU' validates_format_of :postal_code, :with =&gt; %r{^\d{5}([\-]\d{4})?$}, :message =&gt; "should be in the format 11111 or 11111-1111", :allow_nil =&gt; true, :if =&gt; :country_code == 'US' validates_format_of :postal_code, :with =&gt;%r{^[ABCEGHJKLMNPRSTVXY]{1}\d{1}[A-Z]{1} *\d{1}[A-Z]{1}\d{1}$}, :message =&gt; "should be in the format A1A 1A1 (try making letters capitalized)", :allow_nil =&gt; true, :if =&gt; :country_code == 'CA' # ridculously long (but thorough) regex courtesy of Wikipedia (http://en.wikipedia.org/wiki/Postcodes_in_the_United_Kingdom) validates_format_of :postal_code, :with =&gt; %r{^(GIR 0AA)|(((A[BL]|B[ABDHLNRSTX]?|C[ABFHMORTVW]|D[ADEGHLNTY]|E[HNX]?|F[KY]|G[LUY]?|H[ADGPRSUX]|I[GMPV]|JE|K[ATWY]|L[ADELNSU]?|M[EKL]?|N[EGNPRW]?|O[LX]|P[AEHLOR]|R[GHM]|S[AEGKLMNOPRSTY]?|T[ADFNQRSW]|UB|W[ADFNRSV]|YO|ZE)[1-9]?[0-9]|((E|N|NW|SE|SW|W)1|EC[1-4]|WC[12])[A-HJKMNPR-Y]|(SW|W)([2-9]|[1-9][0-9])|EC[1-9][0-9]) [0-9][ABD-HJLNP-UW-Z]{2})$}, :message =&gt; "invalid postal code (try making letters capitalized)", :allow_nil =&gt; true, :if =&gt; :country_code == 'GB' </code></pre> <p>Am I totally off the reservation on this, or is it just the format of the <code>:if</code> options that are hosed up?</p>
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    1. USArslan Ali
    1. USMikeH
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      1. VTUpMod
    1. COI think using a custom validation method would be more readable in this case.
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      1. USAlex Korban
    2. COI was hoping to avoid a custom validator/validation method but the readability issue is a valid point. I'll do that--just figured I would see if there was a slick way to do this with the existing validations.
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      1. USMikeH
 

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