如何安装gem 'meta-where'？我在“捆绑包安装”时遇到错误

Question

我使用的是Rails 3.2.9版本

我的gem文件

source 'https://rubygems.org'

gem 'rails', '3.2.9'
gem 'feedzirra'
gem "meta_where"

gem 'sqlite3'

group :assets do
  gem 'sass-rails',   '~> 3.2.3'
  gem 'coffee-rails', '~> 3.2.1'

  gem 'uglifier', '>= 1.0.3'
end

gem 'jquery-rails'

在安装捆绑包时，我得到了如下错误。如何安装meta-where gem？

Bundler could not find compatible versions for gem "arel":
  In snapshot (Gemfile.lock):
    arel (3.0.2)

  In Gemfile:
    meta_where (~> 1.0.4) ruby depends on
      arel (~> 2.0.7) ruby

Running `bundle update` will rebuild your snapshot from scratch, using only
the gems in your Gemfile, which may resolve the conflict.

Answer 1

Meta_where是针对Rails2的--您使用的是Rails3。

meta_where GitHub页面https://github.com/ernie/meta_where指出您应该使用squeel而不是https://github.com/ernie/squeel