module MongoidEmbeddedErrorsMessages

# File lib/mongoid-embedded-errors-messages.rb, line 4
def self.included(klass)
  raise NotMongoidDocument unless klass.included_modules.include? Mongoid::Document
end

# File lib/mongoid-embedded-errors-messages.rb, line 8
def embedded_errors_messages
  merged_errors = errors.messages
  embedded_relations.each do |relation, metadata|
    if metadata[:relation] == Mongoid::Relations::Embedded::Many
      errors = embedded_errors_for_embeds_many_relation(relation)
      merged_errors.merge!(errors) if errors.present?
    elsif metadata[:relation] == Mongoid::Relations::Embedded::One
      errors = embedded_errors_for_embeds_one_relation(relation)
      merged_errors.merge!(errors) if errors.present?
    end
  end
  merged_errors.present? ? merged_errors : nil
end

# File lib/mongoid-embedded-errors-messages.rb, line 24
def embedded_errors_for_embeds_many_relation(relation)
  errors_array = send(relation).map{|doc| doc.try(:embedded_errors_messages)}
  if errors_array.compact.present?
    children_errors = {relation.to_sym => errors_array}
    children_errors.delete_if{|k,v| v.blank? }
  end
  children_errors
end

# File lib/mongoid-embedded-errors-messages.rb, line 33
def embedded_errors_for_embeds_one_relation(relation)
  relation_errors = send(relation).try(:embedded_errors_messages)
  { relation.to_sym => relation_errors } if relation_errors.present?
end