德雷珀 - NoMethodError使用RSpec測試裝飾

Question

我收到試圖用Draper測試時，出現以下錯誤：

NoMethodError: undefined method 'with_unit' for nil:NilClass 

這裏是我的測試代碼：

# spec/decorators/food_decorator_spec.rb 
require 'spec_helper' 

describe FoodDecorator do 
    before { ApplicationController.new.set_current_view_context } 
    FactoryGirl.create(:food) 
    @food = FoodDecorator.first 

    specify { @food.with_unit('water').should == "85.56 g" } 
end 

這是我的裝飾器的代碼：

class FoodDecorator < ApplicationDecorator 
    decorates :food 

    def with_unit(nutrient) 
    model.send(nutrient.to_sym).to_s + " g" 
    end 
end 

我的研究表明該行ApplicationController.new.set_current_view_context sho uld解決這個問題，但它沒有。有什麼想法嗎？

Answer 1

替換爲：

require 'spec_helper' 

describe FoodDecorator do 
    before do 
    ApplicationController.new.set_current_view_context 
    FactoryGirl.create(:food) 
    @food = FoodDecorator.first 
    end 

    specify { @food.with_unit('water').should == "85.56 g" } 
end 

你甚至可以這樣做：

require 'spec_helper' 

describe FoodDecorator do 

    let(:food) { Factory(:food) } 
    subject { FoodDecorator.first } 

    before do 
    food 
    ApplicationController.new.set_current_view_context 
    end 

    specify { subject.with_unit('water').should == "85.56 g" } 
end