私はレールを初めて使用し、レールを使用した実用的なアジャイル Web 開発のデポ アプリケーションに従っていますが、奇妙な問題が発生しています。
私の製品モデルでは、画像の URL フィールドで要求された画像が実際にアセットとして存在することを確認するためのバリデーターを作成しました。これが私の製品モデルコードです。
class Product < ActiveRecord::Base
attr_accessible :description, :image_url, :price, :title
validates :description, :price, :title, :presence => true
validate :image_url_exists, on: :create
def image_url_exists
if Rails.application.assets.find_asset(image_url) == nil
errors.add(:image_url, 'is not valid. The image does not exist.')
end
end
end
問題は、単体テストを実行するときです。それが何であるかは次のとおりです。
require 'test_helper'
class ProductTest < ActiveSupport::TestCase
test "the products attributes should not be empty" do
p = Product.new
assert p.invalid?
end
end
しかし、そうすると、私のコードで一連のエラーが発生します。カスタムバリデータがなければ、すべてうまくいくように見えます。ここに私が現在得ているエラーがあります。
test_the_products_attributes_should_not_be_empty(ProductTest):
TypeError: can't convert nil into String
/var/lib/gems/1.9.1/gems/sprockets-2.2.2/lib/sprockets/base.rb:156:in `initialize'
/var/lib/gems/1.9.1/gems/sprockets-2.2.2/lib/sprockets/base.rb:156:in `new'
/var/lib/gems/1.9.1/gems/sprockets-2.2.2/lib/sprockets/base.rb:156:in `find_asset'
/var/lib/gems/1.9.1/gems/sprockets-2.2.2/lib/sprockets/index.rb:60:in `find_asset'
/var/lib/gems/1.9.1/gems/sprockets-2.2.2/lib/sprockets/environment.rb:78:in `find_asset'
/home/saurabh/Desktop/SCRIPTS/Rails/depot/app/models/product.rb:6:in `image_url_exists'
/var/lib/gems/1.9.1/gems/activesupport-3.2.9/lib/active_support/callbacks.rb:418:in `_run__4343689776242734370__validate__107120755283260520__callbacks'
/var/lib/gems/1.9.1/gems/activesupport-3.2.9/lib/active_support/callbacks.rb:405:in `__run_callback'
/var/lib/gems/1.9.1/gems/activesupport-3.2.9/lib/active_support/callbacks.rb:385:in `_run_validate_callbacks'
/var/lib/gems/1.9.1/gems/activesupport-3.2.9/lib/active_support/callbacks.rb:81:in `run_callbacks'
/var/lib/gems/1.9.1/gems/activemodel-3.2.9/lib/active_model/validations.rb:228:in `run_validations!'
/var/lib/gems/1.9.1/gems/activemodel-3.2.9/lib/active_model/validations/callbacks.rb:53:in `block in run_validations!'
/var/lib/gems/1.9.1/gems/activesupport-3.2.9/lib/active_support/callbacks.rb:403:in `_run__4343689776242734370__validation__107120755283260520__callbacks'
/var/lib/gems/1.9.1/gems/activesupport-3.2.9/lib/active_support/callbacks.rb:405:in `__run_callback'
/var/lib/gems/1.9.1/gems/activesupport-3.2.9/lib/active_support/callbacks.rb:385:in `_run_validation_callbacks'
/var/lib/gems/1.9.1/gems/activesupport-3.2.9/lib/active_support/callbacks.rb:81:in `run_callbacks'
/var/lib/gems/1.9.1/gems/activemodel-3.2.9/lib/active_model/validations/callbacks.rb:53:in `run_validations!'
/var/lib/gems/1.9.1/gems/activemodel-3.2.9/lib/active_model/validations.rb:195:in `valid?'
/var/lib/gems/1.9.1/gems/activerecord-3.2.9/lib/active_record/validations.rb:69:in `valid?'
/var/lib/gems/1.9.1/gems/activemodel-3.2.9/lib/active_model/validations.rb:203:in `invalid?'