Rails回形針自定義內插錯誤測試

Question

當我嘗試在測試中使用自定義插值時失敗。然而，萬物在開發環境中工作良好，並且測試在沒有自定義插值+ 的情況下工作，有時它們與自定義插值一起工作。

我的代碼：

class ActiveSupport::TestCase 
    fixtures :all 
    def file_fixture(filename = "sample_file.png") 
    File.new("test/fixtures/documents/#{filename}") 
    end 
end 

test 'document attachment must be from valid file extension' do 
    document = Document.new 
    document.appeal_id = Appeal.first.id 
    document.attachment = file_fixture('FailTest - bad filename extension.txt') 
    assert_not document.valid?, 'Document attachment should not be TXT' 
    document.attachment = file_fixture('Test - medical.pdf') 
    assert document.valid?, 'Document attachment with pdf extension should be valid' 
end 

application.rb中：

Paperclip.interpolates :year do |attachment, style| 
    attachment.instance.created_at.year 
end 

Paperclip.interpolates :month do |attachment, style| 
    attachment.instance.created_at.month 
end 

Paperclip.interpolates :appeal_id do |attachment, style| 
    attachment.instance.appeal.id 
end 

Paperclip.interpolates :env do |attachment, style| 
    Rails.env 
end 

Paperclip.options[:command_path] = 'C:\Program Files (x86)\GnuWin32\bin' 
Paperclip::Attachment.default_options[:default_url] = '/images/missing.jpg' 
Paperclip::Attachment.default_options[:path] = ':rails_root/public/attachments/:env/:year/:month/:appeal_id/:hash.:extension' 
Paperclip::Attachment.default_options[:url] = '/attachments/:env/:year/:month/:appeal_id/:hash.:extension' 

我得到的錯誤是：

Minitest::UnexpectedError: NoMethodError: undefined method `year' for nil:NilClass 
    config/application.rb:27:in `block in <class:Application>' 
    test/models/document_test.rb:43:in `block in <class:DocumentTest>' 

，這是因爲在:year插值created_at解析nil

我的問題： 它爲什麼只解決了測試環境而不是所有的時間？ （另一個測試成功地將文件添加到使用日期調度的路徑）

Answer 1

我認爲問題在於您有未保存的Document實例。
您只需撥打document = Document.new即可，document.created_at爲nil。

嘗試保存Document實例document = Document.create(...)或在斷言前調用document.save。

或者你也可以手動分配created_at像
document = Document.new(created_at: Time.now)

或者你可以更新插值代碼與nil值工作像

Paperclip.interpolates :year do |attachment, style| 
    # it would be nil in case of created_at is nil 
    attachment.instance.created_at.try(:year) 
end