select2和Bootstrap没有样式化rails中的输入字段元素

Question

根据http://ivaynberg.github.io/select2/#documentation

，我的输入字段看起来不应该如此

Bootstrap或select2样式不仅不适用于输入字段，我在这里得到了标签和表单的一些有趣的重复行为。

我未经证实的骚扰是Bootstrap未正确注册或与select2通信。

应用程序/视图/字符/ _form.html.haml

= form_for(@character, :html => { :multipart => true }) do |f|
    - if @character.errors.any?
        #error_explanation
            %h2= "#{pluralize(@character.errors.count, "error")} prohibited this character from being saved:"
            %ul
                - @character.errors.full_messages.each do |msg|
                    %li= msg

    #stripe_error.alert.alert-danger{ :style => "display:none" }
        %noscript JavaScript is not enabled and is required for this form. First enable it in your web browser settings.

    .form-group
        = f.label :name
        = f.text_field :name, autofocus: true
    .form-group
        = f.label :image
        = f.file_field :image
    .form-group
        = f.label :universe_ids, "Link Universes"
        = f.collection_select :universe_ids, Universe.order(:name), :id, :name, {}, {multiple: true}  # Getting a lot of funny behavior with these lines            
    .action
        = f.submit

characters.js.coffee

jQuery ->
  $("#character_universe_ids").select2(
    placeholder: "Pick a Universe");

的application.js

//= require jquery
//= require jquery.turbolinks
//= require jquery_ujs
//
//= require bootstrap
//= require select2
//
//= require_self
//= require_tree .
//= require turbolinks

application.css.scss

@import "resets";
@import "bootstrap";
@import "custom/cp_variables";
@import "custom/cp_custom";
@import "custom/cp_responsive";

/*
 *= require select2
 *= require select2-bootstrap
 *
 *= require_self
 *= require_tree .
 */

如何判断*= select2-bootstrap行是否正常工作？ 我使用的是bootstrap-sass gem，而不是供应商资产文件夹中的复制库。

的Gemfile

source 'https://rubygems.org'

ruby "2.0.0"

gem 'rails', '4.0.0'

gem 'haml-rails', '0.5.1'
gem 'html2haml', '~> 1.0.1'

gem 'sass-rails', '~> 4.0.0'
gem 'autoprefixer-rails'
gem 'bootstrap-sass', '~> 3.1.1'

gem 'coffee-rails', '~> 4.0.0'
gem 'jquery-rails'

gem 'uglifier', '>= 1.3.0'
gem 'turbolinks', '~>2.2.2'
gem 'jquery-turbolinks', '~>2.0.2'
gem 'jbuilder', '~> 1.2'
gem 'sprockets-rails', :require => 'sprockets/railtie'

gem 'pg', '0.17.1'

group :doc do
  # bundle exec rake doc:rails generates the API under doc/api.
  gem 'sdoc', require: false
end


gem 'nokogiri', '~> 1.6.0'
# Secret keys.
gem 'figaro', '~> 0.7.0'
# Images.
gem 'paperclip', '~> 3.0'
# Image storage.
gem 'paperclip-dropbox', '>= 1.1.7'
# Authentication.
gem 'devise'#, '3.2.3'
# Votes.
gem 'acts_as_votable', '~> 0.9.0'
# Autocomplete form.
gem 'select2-rails'

group :development do
    # For html2haml mass conversion
    # erubis is already included in action pack
    gem 'ruby_parser', '~> 3.1.1'
end

group :test do

end

group :production do
  gem 'rails_12factor', '0.0.2'

  #gem 'aws-sdk', "~> 1.0"
end


# Use ActiveModel has_secure_password
# gem 'bcrypt-ruby', '~> 3.0.0'

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

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

# Use debugger
# gem 'debugger', group: [:development, :test]

我找不到有这个问题的人的任何线索。所有教程都简单地说将简单的.select2()方法应用于正确的DOM元素，但我只是没有得到我应该得到的样式。