Question

I want to adding tagging facility in my application . so, I am using acts_as_taggable_on : https://github.com/mbleigh/acts-as-taggable-on

I have added following line my Gemfile:

gem 'acts-as-taggable-on', '~> 2.2.2'

and when I add following line in my user model:

acts_as_taggable_on

It gives me this error:

undefined local variable or method `acts_as_taggable_on' for User:Class

Kindly, tell me what am I doing wrong?

Answer 1

That gem isn’t going to work with mongoid and mongodb because it is built to allow tagging using a relational database using active record.

The good news is that this is very simple to do in mongoid. Simply add a new Array field named after whatever you would have listed as being acts_as_taggable_on. If you also have acts_as_taggable, include a generic tags field as well.

If you were going to have a model that looked like this:

class User < ActiveRecord::Base
  acts_as_taggable
  acts_as_taggable_on :skills, :interests
end

You would build it like this with mongoid:

class User
  include Mongoid::Document
  field :tags, type: Array
  field :skills, type: Array
  field :interests, type: Array
end

Then when you wanted to save a tag, lets say as an interest you would do the following:

@user.interests << 'computers'