validation - Rails: How do I use validates_presence_of based on data in an associated class -


i have:

class < activerecord::base   attr_accessible :detailed_info    belongs_to b end  class b < activerecord::base   attr_accessible :requires_detail_in_a_of_type, :basic_detail end

i want validation looks @ a, , verifies :detailed_info present iff associated b.requires_detail_in_a_of_type == "some value".

i can write write validate method, extending activerecord::validator, necessary? straightforward:

validates_presence_of :detailed_info, if: lambda { self.b.requires_detail_in_a_of_type = "some value" }

isn't working (with, or out "self.").


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