Question

After 3-4 months when I returned to another project on RoR, with Mongoid. I was stuck on the strange issue. As I had been following Mongoid documented.
so generated mongoid.yml, deleted database.yml. and changed

#require 'rails/all'
require "action_controller/railtie"
require "action_mailer/railtie"
require "active_resource/railtie"
require "rails/test_unit/railtie"
require "sprockets/railtie" # Uncomment this line for Rails 3.1+

in config/application.rb.

I am still facing the issue. with, starting the server.

configuration.rb:85:in `method_missing': undefined method `active_record' for #<Rails::Application::Configuration:0x9441fd4> (NoMethodError)

Oops I had to comment out
config.active_record.mass_assignment_sanitizer = :strict
and
config.active_record.auto_explain_threshold_in_seconds = 0.5
in config/environments/development.rb.

Answer 1

Comment the following lines

config.active_record.mass_assignment_sanitizer = :strict
config.active_record.auto_explain_threshold_in_seconds = 0.5

in config/environments/development.rb and config/environments/test.rb