Module: Glue::Validation::ClassMethods

Defined in:
lib/og/validation.rb

Instance Method Summary collapse

Instance Method Details

Validate that a property relation is not nil. This works for all relations.

You should not put a validation in both related classes, because it can cause infinite looping.

The Og libraries are required for this method to work. You can override this method if you want to use another OR mapping library.

Example

class Uncle

has_many :secrets, Secret
validate_related :secrets

end

class Secret

belongs_to :uncle, Uncle

end



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# File 'lib/og/validation.rb', line 75

def validate_related *params
  c = parse_config(params,
    :msg => Glue::Validation::Errors.invalid_relation, 
    :on => :save 
  )

  params.each do |field|
    define_validation(:related, field, c[:on]) do |obj|
      value = obj.send(field)
      if value.members.length == 0
        obj.errors.add(field, c[:msg])
      else
        valid = value.members.inject do |memo, rel_obj| 
          (rel_obj.nil? or rel_obj.valid?) and memo
        end
        obj.errors.add(field, c[:msg]) unless valid
      end
    end
  end
end

#validate_unique(*params) ⇒ Object

Validates that the given field(s) contain unique values. Ensures that if a record is found with a matching value, that it is the same record, allowing updates.

The Og libraries are required for this method to work. You can override this method if you want to use another OR mapping library.

Example

validate_unique :param, :msg => ‘Value is already in use’ – TODO: :unique should implicitly generate validate_unique. ++



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# File 'lib/og/validation.rb', line 35

def validate_unique *params
  c = parse_config(params, :on => :save)

  params.each do |field|
    c[:msg] ||= "#{self.name} with this #{field} already exists"
  
    define_validation(:unique, field, c[:on]) do |obj|
      # What to do if value is nil?  Right now it is an empty string,
      # which can need to be unique.
      value = obj.send(field) || ''
      others = [*obj.class.send("find_by_#{field}".to_sym, value)]
  
      unless others[0].nil?
        obj.errors.add(field, c[:msg]) if others.size > 1 or others[0].oid != obj.oid
      end
    end
  end
end