Ruby on rails 如何为rspec中的创建和更新操作编写测试用例？

餐厅和位置模型包含HABTM协会。 如何为控制器编写测试用例

def create
    @restaurant = Restaurant.find(params[:restaurant_id])
    @location =  @restaurant.locations.create(location_params)
    if @location.save   
        flash[:notice] = 'Location added!'   
        redirect_to admin_locations_path    
    else   
        flash[:error] = 'Failed to edit location!'   
        render :new   
    end   
end   

def update   
    @location = Location.find(params[:id])   
    if @location.update_attributes(location_params)   
        flash[:notice] = 'Location updated!'   
        redirect_to admin_locations_path   
    else   
        flash[:error] = 'Failed to edit Location!'   
        render :edit   
    end   
end    

---

您只需使用以下代码段创建规范：

 Restaurant = FactoryBot.create(:Restaurant, name: Faker::Name.name)
 post :create, params: { location: {restaurant_ids:[Restaurant.id]}, format: 'json'
 expect(response.status).to eq(200)

---

尝试以下代码来创建

restaurant = FactoryBot.create(:restaurant, name: Faker::Name.name)
post :create, params: { restaurant_id: restaurant.id, location: {restaurant_ids:[restaurant.id]}, format: 'js' }
expect(response).to have_http_status(:success)

请尝试以下代码进行更新

restaurant = FactoryBot.create(:restaurant, name: Faker::Name.name)
location = FactoryBot.create(:location, restaurant_id: restaurant.id)
patch :update, params: { id: location.id, location: {restaurant_ids:[restaurant.id]}, format: 'js' }
expect(response).to have_http_status(:success)

---

对于这样的简单控制器，我还希望确保正在创建记录，因此我还要测试以下内容：

restaurant = FactoryBot.create(:restaurant, name: Faker::Name.name)
expect {
  post(
    :create,
    params: {
      restaurant_id: restaurant.id,
      location: { restaurant_ids:[restaurant.id] },
      format: 'js'
    }
  )
}.to change{ Location.count }.by(1)

---

它显示失败/错误：@restaurant=restaurant.find（params[：restaurant_id]）nomethoderor:for的未定义方法“find”#