ruby-on-rails - 在 gem 中测试 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(interface)。

我将模型移动到一个模块中并将其放入 lib/invite_interface/invite.rb

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

  def to_json; end;
  def from_json; end;
end

我将 rspec 放入 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，因为事件记录/rspec 需要一个事件连接。

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 寻找数据库连接？

Answer 1

无论如何，您都需要使用数据库测试您的库，因此您不妨使用内存中的 SQLite 数据库进行测试。只需将此添加到 spec_helper.rb :

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

并按如下方式创建您的架构:

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

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