Class: Perfectline::ValidatesExistence::Validator::ExistenceValidator

Inherits:
ActiveModel::EachValidator
  • Object
show all
Defined in:
lib/validates_existence.rb

Instance Method Summary collapse

Constructor Details

#initialize(options) ⇒ ExistenceValidator

Returns a new instance of ExistenceValidator.



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# File 'lib/validates_existence.rb', line 8

def initialize(options)
  # set the default message if its unspecified
  options[:message] ||= :existence
  options[:both]    = true unless options.key?(:both)
  options[:allow_new] = false unless options.key?(:allow_new)
  super(options)
end

Instance Method Details

#exists?(target_class, value) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/validates_existence.rb', line 70

def exists?(target_class, value)
  (options[:allow_new] && value.new_record?) || target_class.exists?(value)
end

#validate(record) ⇒ Object 



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# File 'lib/validates_existence.rb', line 16

def validate(record)
  attributes.each do |attribute|
    value = record.read_attribute_for_validation(attribute)
    target_id = if !attribute.match(/_id$/) && options[:allow_nil]
        association = record.class.reflect_on_association(attribute)
        association.respond_to?(:foreign_key)  ? record[association.foreign_key] : record[association.association_foreign_key]
      else
        value
      end
    next if (target_id.nil? && value.nil? && options[:allow_nil]) || (value.blank? && options[:allow_blank])
    validate_each(record, attribute, value)
  end
end

#validate_each(record, attribute, value) ⇒ Object 



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# File 'lib/validates_existence.rb', line 30

def validate_each(record, attribute, value)
  normalized = attribute.to_s.sub(/_id$/, "").to_sym
  association = record.class.reflect_on_association(normalized)

  if association.nil? || !association.belongs_to?
    raise ArgumentError, "Cannot validate existence on #{normalized}, not a :belongs_to association"
  end

  target_class = nil

  # dealing with polymorphic belongs_to
  if association.options[:polymorphic]
    foreign_type = record.send(association.options[:foreign_type] || association.foreign_type)
    target_class = foreign_type.constantize unless foreign_type.nil?
  else
    target_class = association.klass
  end

  if value.nil? || target_class.nil? || !exists?(target_class, value)
    errors = [attribute]

    # add the error on both :relation and :relation_id
    if options[:both]
      if ActiveRecord::VERSION::MAJOR > 3 || (ActiveRecord::VERSION::MAJOR == 3 && ActiveRecord::VERSION::MINOR >= 1)
        foreign_key = association.foreign_key
      else
        foreign_key = association.primary_key_name
      end

      errors << (attribute.to_s.ends_with?("_id") ? normalized : foreign_key)
    end

    messages = [:"#{record.class.i18n_scope}.errors.messages.existence", "does not exist"]

    errors.each do |error|
      record.errors.add(error, options[:message], :message => messages)
    end
  end
end