测试gem内的ActiveRecord模型？

Question

我正在尝试从Rails 3.2.3应用程序中提取一组模型到gem中,以便它们可以用作应用程序之间的共享接口.

我将模型移动到模块中并将其放在lib/invite_interface/invite.rb中

module InviteInterface
  class Invite < ActiveRecord::Base
    belongs_to :user
  end

  def to_json; end;
  def from_json; end;
end

我把rspec放到gemfile中,让它成功运行,创建了以下规范:

require 'spec_helper'

describe InviteInterface::EncounterSurvey do
  it 'should belong to user' do
    subject.should respond_to(:user)
  end

end

不幸的是,我无法在模型上执行rspec,因为活动记录/ rspec需要活动连接.

1) InviteInterface::Invite should belong to encounter survey set
   Failure/Error: subject.should respond_to(:user)
   ActiveRecord::ConnectionNotEstablished:
     ActiveRecord::ConnectionNotEstablished
   # /Users/justin/.rbenv/versions/1.9.3-p0/lib/ruby/gems/1.9.1/gems/activerecord-3.2.3/lib/active_record/connection_adapters/abstract/connection_pool.rb:398:in `retrieve_connection'
   # /Users/justin/.rbenv/versions/1.9.3-p0/lib/ruby/gems/1.9.1/gems/activerecord-3.2.3/lib/active_record/connection_adapters/abstract/connection_specification.rb:168:in `retrieve_connection'
   # /Users/justin/.rbenv/versions/1.9.3-p0/lib/ruby/gems/1.9.1/gems/activerecord-3.2.3/lib/active_record/connection_adapters/abstract/connection_specification.rb:142:in `connection'
   # /Users/justin/.rbenv/versions/1.9.3-p0/lib/ruby/gems/1.9.1/gems/activerecord-3.2.3/lib/active_record/model_schema.rb:228:in `columns'
   # /Users/justin/.rbenv/versions/1.9.3-p0/lib/ruby/gems/1.9.1/gems/activerecord-3.2.3/lib/active_record/model_schema.rb:243:in `column_defaults'

如何防止ActiveRecord查找数据库连接？

Answer 1

无论如何,您需要使用数据库测试库,因此您也可以使用内存中的SQLite数据库进行测试.只需将其添加到spec_helper.rb:

ActiveRecord::Base.establish_connection(:adapter => "sqlite3", 
                                       :database => ":memory:")

并按如下方式创建架构:

ActiveRecord::Schema.define do
  self.verbose = false

  create_table :invites, :force => true do |t|
    t.string :text
  end
  ...
end

Answer 2

我发现如果你测试你的模型是孤立的,你也可以在定义ActiveRecord连接时尝试利用SQLite3的内存功能来获得非常快的规格:

ActiveRecord::Base.establish_connection(
  :adapter => 'sqlite3',
  :database => ':memory:'
)

尝试一下,它对我来说就像一个魅力,让我的模型测试得更快.