Question

我有一个使用Mongoid 4.0.2的Rails应用程序。我将Mongoid升级到版本5.0.0并开始收到此错误

....gems/2.2.0/gems/less-rails-2.7.0/lib/less/rails/railtie.rb:19:in `block in <class:Railtie>': undefined method `register_preprocessor' for nil:NilClass (NoMethodError)

如何解决此问题或是否有任何手册如何将Mongoid升级到5.0.0版本？

的Gemfile

 source 'https://rubygems.org'


# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '4.2.0.beta4'
# Use SCSS for stylesheets
gem 'sass-rails', '~> 5.0.0.beta1'
# Use Uglifier as compressor for JavaScript assets
gem 'uglifier', '>= 1.3.0'
# Use CoffeeScript for .coffee assets and views
gem 'coffee-rails', '~> 4.1.0'
# See https://github.com/sstephenson/execjs#readme for more supported runtimes
# gem 'therubyracer', platforms: :ruby

# Use jQuery as the JavaScript library
gem 'jquery-rails', '~> 4.0.0.beta2'
# Turbolinks makes following links in your web application faster. Read more: https://github.com/rails/turbolinks
gem 'turbolinks'
# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
gem 'jbuilder', '~> 2.0'
# bundle exec rake doc:rails generates the API under doc/api.
gem 'sdoc', '~> 0.4.0', group: :doc

#new gems
#database
gem 'mongoid', '~> 5.0.0.beta'
gem "mongoid-paperclip", :require => "mongoid_paperclip"
gem 'bson_ext'
#stile
gem "therubyracer"
gem "less-rails" #Sprockets (what Rails 3.1 uses for its asset pipeline) supports LESS
gem "twitter-bootstrap-rails"
gem 'bootstrap_form'
gem 'bootstrap-sass', '~> 3.3.4'
gem 'bootswatch-rails'
gem 'simple_form'
gem 'mongo'
gem "figaro"
gem 'sidekiq'
gem 'sidekiq-status'
gem 'rubyzip'
#gem 'sidekiq_status'
#gem 'sidekiq-status'
gem 'sinatra', require: false
gem 'slim'
gem 'capistrano', '~> 3.1.0'

# rails specific capistrano funcitons
gem 'capistrano-rails', '~> 1.1.0'
gem 'capistrano-rails-console'

# integrate bundler with capistrano
gem 'capistrano-bundler'

# if you are using RBENV
gem 'capistrano-rbenv', "~> 2.0"
gem 'capistrano-sidekiq', github: 'seuros/capistrano-sidekiq'

gem 'capistrano-passenger'
gem 'utf8-cleaner'
gem "devise"
gem 'rollbar', '~> 1.5.3'


#gem 'bson', '~> 3.0'
# Use ActiveModel has_secure_password
# gem 'bcrypt', '~> 3.1.7'

# Use Unicorn as the app server
# gem 'unicorn'

# Use Capistrano for deployment
# gem 'capistrano-rails', group: :development

group :development, :test do
  gem 'thin'
  # Call 'byebug' anywhere in the code to stop execution and get a debugger console
  gem 'byebug'

  # Access an IRB console on exception pages or by using <%= console %> in views
  gem 'web-console', '~> 2.0.0.beta4'

  # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
  gem 'spring'

  #new gems
  gem "rspec-rails"
  gem 'pry-rails'
  gem 'pry-rescue'
  # Access an IRB console on exception pages or by using <%= console %> in views
  gem 'better_errors'
  #gem 'mongoid-rspec', '~> 2.1.0'


end

Answer 1

我在这里解决了这个问题

从Gemfile gem "less-rails"
从application.rb中移除require "mongo"
在mongoid.yml中将sessions:更改为clients:

Answer 2

升级到Mongoid 5时要注意的最重要的事情是mongoid.yml

自：

<%= rails_env %>:
  sessions:
    default:
      database: <%= mongodb_database %>
      hosts:
        - <%= mongodb_staging_host %>
        username: <%= mongodb_user %>
        password: <%= mongodb_password %>
      options:
        read: :primary_preferred

要：

<%= rails_env %>:
  clients:
    default:
      database: <%= mongodb_database %>
      hosts:
        - <%= mongodb_staging_host %>
      options:
        user: <%= mongodb_user %>
        password: <%= mongodb_password %>
        read:
          mode: :primary_preferred

将sessions更改为clients
将username（将成为user）和password移至options
如图所示更改read模式，如果有的话。

Bottomline是在与this page

Ruby on Rails将Mongoid升级到5.0.0版

2 个答案: