Rspec的測試錯誤 - 未定義的方法創建

Question

我試着去改善我的Rspec的測試，並寫更多的人，在這個例子中，我可以創造一個圖像細膩測試通過了，但我對刪除該圖像的問題..

這裏是我的測試，到目前爲止

describe TimeTable do 
    before(:each) do 

    Paperclip::Attachment.any_instance.stub(
    :post_process 
).and_return(true) 
    Paperclip::Attachment.any_instance.stub(
    :save 
).and_return(true) 
    # This was a little harder - had to check the stack trace for errors. 
    Paperclip::Attachment.any_instance.stub(
    :queue_all_for_delete 
).and_return([]) 
end 

it 'should save a image for TimeTable' do 
    image = Rack::Test::UploadedFile.new(
    'spec/fixtures/rails.png', 'image/png' 
) 
    @timetable = TimeTable.new(
    photo: image 
) 
    @timetable.save.should eq(true) 
    @timetable.photo_file_name.should eq('rails.png') 
end 

it 'should delete an image for TimeTable' do 
    image = Rack::Test::UploadedFile.new(
    'spec/fixtures/rails.png', 'image/png' 
) 
    @timetable.create!(
    photo: image 
) 
    expect { @timetable.destroy }.to change { TimeTable.count }.by(-1) 
end 
end 

錯誤/失敗我得到的是

TimeTable should delete an image for TimeTable 
Failure/Error: @timetable.create!(
NoMethodError: 
    undefined method `create!' for nil:NilClass 
# ./spec/models/timetable_spec.rb:33:in `block (2 levels) in <top (required)>' 

怎樣運用這個測試來刪除圖像

任何幫助表示讚賞

Answer 1

更換

@timetable.create!(
    photo: image 
) 

與

@timetable= TimeTable.create!(
    photo: image 
) 

create!是一個類的方法不是實例方法。你正在調用TimeTable的實例。因此，錯誤。