Class: CouchRest::Model::Validations::UniquenessValidator

Inherits:
ActiveModel::EachValidator
  • Object
show all
Defined in:
lib/couchrest/model/validations/uniqueness.rb

Overview

Validates if a field is unique

Instance Method Summary collapse

Instance Method Details

#setup(klass) ⇒ Object

Ensure we have a class available so we can check for a usable view or add one if necessary.



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# File 'lib/couchrest/model/validations/uniqueness.rb', line 12

def setup(klass)
  @klass = klass
end

#validate_each(document, attribute, value) ⇒ Object 



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# File 'lib/couchrest/model/validations/uniqueness.rb', line 17

def validate_each(document, attribute, value)
  view_name = options[:view].nil? ? "by_#{attribute}" : options[:view]
  # Determine the base of the search
  base = options[:proxy].nil? ? @klass : document.instance_eval(options[:proxy])

  if base.respond_to?(:has_view?) && !base.has_view?(view_name)
    raise "View #{document.class.name}.#{options[:view]} does not exist!" unless options[:view].nil?
    @klass.view_by attribute
  end

  docs = base.view(view_name, :key => value, :limit => 2, :include_docs => false)['rows']
  return if docs.empty?

  unless document.new?
    return if docs.find{|doc| doc['id'] == document.id}
  end
  
  if docs.length > 0
    document.errors.add(attribute, :taken, :default => options[:message], :value => value)
  end
end