Model validation and Aray

Rails
#1

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

#2

On Fri, Dec 16, 2011 at 13:30, Fresh M. [email protected] wrote:

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 ?

Use a custom validator method that looks at the elements. See:

http://guides.rubyonrails.org/active_record_validations_callbacks.html#custom-validators

and use an array of bad elements with a method like so:

badElts = [:put, :bad, :element, :values, :here]

def validate record
record.array_of_stuff.each do |elt|
record.errors[:name] << “’#{elt}’ is forbidden” if
badElts.include? elt
end
end

-Dave

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