[Rails] Model validation and Aray

How to validate a aray in model?

In form I have a multiple select option, that returns a array

(in model I convert array to string and save it to database)

array can only have values ['A','B','C','D','E','']

So how can I valdate that some value is not a X or Y ?

The model code is:

attr_accessor :categories

def categories
if self.category
@categories = self.category.split
else
@categories = ['']
end
end

def categories=(xxx)
@categories = xxx
return if xxx.blank?
self.category = xxx.join(" ")
end

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