Mongoid: uninitialized constant (NameError) - ruby

Question

I'm currently trying to write a very basic portion of code that reads a ruby file and instantiate some documents into my local MongoDB.
The class modeling my Mongo document is in a separate file called 'search_term.rb', as follows:
class SearchTerm
include Mongoid::Document
field :search_term, type: String
end
In a separate file called 'populate_database.rb' that resides in the same folder as 'search_term.rb', I'm trying to read from a list and create new documents and look into my MongoDB Compass if they are actually being created:
require_relative 'search_term'
business_list = [
'business name 1',
'business name 2',
'business name 3',
'business name 4',
]
for business in business_list
s_term = SearchTerm.new()
s_term.search_term = business
s_term.post
end
The problem is: when I run 'ruby populate_database.rb' I'm getting the error:
<class:SearchTerm>': uninitialized constant SearchTerm::Mongoid (NameError)
I have already tried creating an empty Gemfile and writing:
gem 'mongo'
gem 'mongoid'
into them and running 'bundle install'. After that the following Gemfile.lock file is created:
GEM
specs:
activemodel (6.1.4.1)
activesupport (= 6.1.4.1)
activesupport (6.1.4.1)
concurrent-ruby (~> 1.0, >= 1.0.2)
i18n (>= 1.6, < 2)
minitest (>= 5.1)
tzinfo (~> 2.0)
zeitwerk (~> 2.3)
bson (4.12.1)
concurrent-ruby (1.1.9)
i18n (1.8.10)
concurrent-ruby (~> 1.0)
minitest (5.14.4)
mongo (2.13.0)
bson (>= 4.8.2, < 5.0.0)
mongoid (7.3.2)
activemodel (>= 5.1, < 6.2)
mongo (>= 2.10.5, < 3.0.0)
ruby2_keywords (~> 0.0.5)
ruby2_keywords (0.0.5)
tzinfo (2.0.4)
concurrent-ruby (~> 1.0)
zeitwerk (2.4.2)
PLATFORMS
x64-mingw32
DEPENDENCIES
mongo
mongoid
BUNDLED WITH
2.2.27
But the problem still persists. Can you guys give me some advice on how to solve this one?
Thanks in advance!!

Answer 1

If you are not using Rails, you need to require "mongoid" yourself somewhere in your application and then load Mongoid configuration. See here for an example of how to do that.