Question

I m testing with Rspec a model named Solutions which has many Likes. Solution stores how many Likes it have (counter_cache). It has a "likes_count" attribute (and respective db field).

当我创建与解决方案有关的类似记录时,我预计,解决办法将“类似”的特性从零提高到1。当我这样做时,它就能够运作。

But when I run the spec, doing the SAME THING I do in console, it update TWICE the "likes_count" field, setting it to 2.

look:

irb(main):001:0> solution = Factory(:solution)
irb(main):004:0> solution.likes_count 
=> nil
irb(main):006:0> like = Factory(:like, :likeable => solution)
=> #<Like id: 1, user_id: 2, likeable_id: 1, likeable_type: "Solution", 
   created_at: "2011-11-23 19:31:23", updated_at: "2011-11-23 19:31:23">
irb(main):007:0> solution.reload.likes_count
=> 1

检查具体结果 NOT WorkingING:

 1) Solution counter cache should be increased when a like is created
 Failure/Error: subject.reload.likes_count.should be 1

   expected #<Fixnum:3> => 1
        got #<Fixnum:5> => 2

   Compared using equal?, which compares object identity,
   but expected and actual are not the same object. Use
    actual.should == expected  if you don t care about
   object identity in this example.
 # ./spec/models/solution_spec.rb:45:in `block (3 levels) in <top (required)>

这里指的是:

describe "counter cache" do
  let(:solution) { Factory(:solution) }

  it "should be increased when a like is created" do
    Factory(:like, :likeable => solution)
    solution.reload.likes_count.should be 1
  end
end

我对测试.log进行了研究,我认识到,在测试中,对反切一栏进行更新的质疑是两次。

  SQL (0.5ms)  INSERT INTO "likes" ("created_at", "likeable_id", "likeable_type", "updated_at", "user_id") VALUES (?, ?, ?, ?, ?)  [["created_at", Wed, 23 Nov 2011 19:38:31 UTC +00:00], ["likeable_id", 121], ["likeable_type", "Solution"], ["updated_at", Wed, 23 Nov 2011 19:38:31 UTC +00:00], ["user_id", 204]]
  SQL (0.3ms)  UPDATE "solutions" SET "likes_count" = COALESCE("likes_count", 0) + 1 WHERE "solutions"."id" IN (SELECT "solutions"."id" FROM "solutions" WHERE "solutions"."id" = 121 ORDER BY id DESC)
  SQL (0.1ms)  UPDATE "solutions" SET "likes_count" = COALESCE("likes_count", 0) + 1 WHERE "solutions"."id" IN (SELECT "solutions"."id" FROM "solutions" WHERE "solutions"."id" = 121 ORDER BY id DESC)
  Solution Load (0.3ms)  SELECT "solutions".* FROM "solutions" WHERE "solutions"."id" = ? LIMIT 1  [["id", 121]]

Answer 1

我有同样的问题。它指出,我的<代码>spec_helper.rb正在第二次装上模型,从而造成第二次回击来更新反射。确保你的解决方案模式被另一进程重新载荷。

以上答案也是正确的:你需要使用=,而不是be进行比较,但这不能确定你在记录中看到的多种更新。

Answer 2

请在您的记录中找到答案:

当您使用<代码>be时,对<代码>object_id进行了比较。对于诸如<代码>true<>/code>和1等多种物体而言,这种编号始终相同。 <代码>id 见2。 Try in console:1.object_id #=> 2
So replace your test with: solution.reload.likes_count.should eql 1 or even solution.reload.likes_count.should == 1

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