Question

如何在控制器中获取一个模型？

示例：

# Model Spec
it 'does something' do
  allow(model).to receive(:value).and_return 100
  model2 = FactoryGirl.create :model
  allow(model2).to receive(:value).and_return 99
  # next line fails because it returns 100. when fetched, model2.value = 0
  expect(model.subtract_last_model).to eq 1
end

# Model
def subtract_last_model
 value - Model.last.value
end

我需要能够将model2又名Model.last存根以返回99。

当然，我可以编写以下内容，然后编写一个规范来查看是否使用正确的参数进行了调用，但如果有其他方法，我很好奇：

def subtract_model(model)
  value - model.value
end

Answer 1

Model.last不返回存根model2，但会从数据库重新加载未存档的model2版本。因此：

it 'does something' do
  allow(model).to receive(:value).and_return 100
  model2 = FactoryGirl.create :model
  allow(model2).to receive(:value).and_return 99

  allow(Model).to receive(:last).and_return(model2)

  expect(model.subtract_last_model).to eq 1
end

Answer 2

它＆＃39;简单，只需使用Model存根model2：

it 'does something' do
  allow(model).to receive(:value).and_return 100
  model2 = FactoryGirl.create :model

  #  stub Model
  allow(Model).to receive(:last).and_return model2
  allow(model2).to receive(:value).and_return 99

  # next line fails because it returns 100. when fetched, model2.value = 0
  expect(model.subtract_last_model).to eq 1
end

Rspec Stub获取模型

2 个答案: