Question

在我的项目中,user将有许多>项目,在项目制作时,有一层空白点是Datetime.now。

# item.rb
class Item < ActiveRecord::Base

  before_create :calculate_onshelf_time

  default_scope :order =>  items.onshelf_at DESC 

  def calculate_onshelf_time
    self.onshelf_at = DateTime.now
  end

end

在用户模型测试中,我试图说服自己相信检索的命令确实是items.onshelf_at DESC。因此,我做了以下几句,但结果却被逆转。 (姓名:[@item1,@item2])

# spec/models/user_spec.rb
before :each do
  @user = User.create(@attr)
  @item1 = Factory(:item, :owner=>@user, :onshelf_at => 2.days.ago, :created_at => 2.days.ago)
  @item2 = Factory(:item, :owner=>@user, :onshelf_at => 1.day.ago, :created_at => 1.day.ago)        
end


it "should have the right items in the right order" do
  @user.items.should == [@item2, @item1]
end

我检查了女工厂,发现onshelf_at 是倾听女工厂初创的。相反,它沿用了在“create 规则”之前,并用试验时间来估价!

Failure/Error: @user.items.should == [@item2, @item1]
   expected: [#<Item id: 2, description: "this is an item", img_link: "http://www.example.com/photos/some_pic.jpg", category_id: 5, onshelf: true, created_at: "2011-11-20 11:19:15", updated_at: "2011-11-21 11:19:15", onshelf_at: "2011-11-21 11:19:15", owner_id: 1>, #<Item id: 1, description: "this is an item", img_link: "http://www.example.com/photos/some_pic.jpg", category_id: 5, onshelf: true, created_at: "2011-11-19 11:19:15", updated_at: "2011-11-21 11:19:15", onshelf_at: "2011-11-21 11:19:15", owner_id: 1>]
        got: [#<Item id: 1, description: "this is an item", img_link: "http://www.example.com/photos/some_pic.jpg", category_id: 5, onshelf: true, created_at: "2011-11-19 11:19:15", updated_at: "2011-11-21 11:19:15", onshelf_at: "2011-11-21 11:19:15", owner_id: 1>, #<Item id: 2, description: "this is an item", img_link: "http://www.example.com/photos/some_pic.jpg", category_id: 5, onshelf: true, created_at: "2011-11-20 11:19:15", updated_at: "2011-11-21 11:19:15", onshelf_at: "2011-11-21 11:19:15", owner_id: 1>] (using ==)

我如何确定这一点?

Answer 1

快速固定装置是添加以下条件:calculate_onshelf_time。方法:

 self.onshelf_at = DateTime.now if self.onshelf_at.nil?

But - you don t even need all this. If you can (that is, if you have control over the schema), replace the onshelf_at attribute with a created_at column, which will automatically be set by Rails at the time of creation. If you re using migrations:

 create_table :foo do |t|
   # ...
   t.timestamps
 end

添加<条码>created_at和updated_at 模型的时间范围。

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