How can I get all field names of the Mongoid Document?

ruby-on-rails ruby mongodb mongoid
Yuri Sidorov picture Yuri Sidorov · Aug 10, 2011 · Viewed 12.6k times · Source

I'm building backend system, as written in Iain Hecker's tutorial: http://iain.nl/backends-in-rails-3-1 and I try to adapt it to MongoDB with Mongoid.

So when I need to write in backend/resourse_helper.rb

module Backend::ResourceHelper

  def attributes
    resource_class.attribute_names - %w(id created_at updated_at)
  end

end

I get the following error:

undefined method `attribute_names' for Backend::User:Class

(I rooted backend to "backend/users#index"). Backend::User inherits from User:

class User
  include Mongoid::Document

  devise_for :users

  field :name
  field :address
end

I just need a list of fields for that User:Class, as I guess (i.e. ["email", "name", "address", ...]), but I broke my head trying to find how.

Answer

Ryan Bigg picture Ryan Bigg · Aug 10, 2011

Mongoid already provides you the attributes for an object: 

Model.new.attributes

To get the names for these attributes:

Model.fields.keys

Related questions

How do I validate members of an array field?

I have this model: class Campaign include Mongoid::Document include Mongoid::Timestamps field :name, :type => String field :subdomain, :type => String field :intro, :type => String field :body, :type => String field :emails, :type => Array end Now I …

Read More
Query on Mongoid Hash Field

I want to query on a Hash field for a Mongoid Class. I'm not sure how I can do this with conditions? Here is an example: class Person include Mongoid::Document field :things, :type => Hash end So, let's say …

Read More
Mongoid not in query

I have some trouble with mongoid: test "Test candidate" do User.create(:id => 1, :sex => User::Male, :country => 1, :city => 1) User.create(:id => 2, :sex => User::Female, :country => 1, :city => 1) User.create(:id => 3, :sex => …

Read More