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(model) ⇒ 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(model)
  @model = model
  if options[:view].blank?
    attributes.each do |attribute|
      opts = merge_view_options(attribute)

      if model.respond_to?(:has_view?) && !model.has_view?(opts[:view_name])
        opts[:keys] << {:allow_nil => true}
        model.view_by(*opts[:keys])
      end
    end
  end
end

#validate_each(document, attribute, value) ⇒ Object 



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# File 'lib/couchrest/model/validations/uniqueness.rb', line 26

def validate_each(document, attribute, value)
  opts = merge_view_options(attribute)

  values = opts[:keys].map{|k| document.send(k)}
  values = values.first if values.length == 1

  model = (document.respond_to?(:model_proxy) && document.model_proxy ? document.model_proxy : @model)
  # Determine the base of the search
  base = opts[:proxy].nil? ? model : document.instance_eval(opts[:proxy])

  if base.respond_to?(:has_view?) && !base.has_view?(opts[:view_name])
    raise "View #{document.class.name}.#{opts[:view_name]} does not exist for validation!"
  end

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

  unless document.new?
    return if rows.find{|row| row['id'] == document.id}
  end

  if rows.length > 0
    opts = options.merge(:value => value)
    opts.delete(:scope) # Has meaning with I18n!
    document.errors.add(attribute, :taken, opts)
  end
end