railsでgem「CarrierWave」を使用してユーザー画像のアップロード処理を行なっています。
そこで、userが画像をアップロードしなかったら(user_imageがnil)だったら、デフォルト画像を表示させるように設定したのですが、以下のエラーが発生してしまいます。
Nil location provided. Can't build URI. #エラー発生部分 <%= image_tag @current_user.user_image.url, class: 'user_image' %>
CarrierWaveでのデフォルト画像設定は以下のコードです。どこが不備があるのでしょうか?ご教授願います。
default.jpgの配置場所は、aap/assets/images にあります。
class UserImageUploader < CarrierWave::Uploader::Base # Include RMagick or MiniMagick support: # include CarrierWave::RMagick # include CarrierWave::MiniMagick # Choose what kind of storage to use for this uploader: storage :file # storage :fog # Override the directory where uploaded files will be stored. # This is a sensible default for uploaders that are meant to be mounted: def store_dir "uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}" end # Provide a default URL as a default if there hasn't been a file uploaded: def default_url(*args) # # For Rails 3.1+ asset pipeline compatibility: # #ActionController::Base.helpers.asset_path("fallback/" + [version_name, "default.jpg"].compact.join('_')) "default.jpg" # "/images/" + [version_name, "default.png"].compact.join('_') end # Process files as they are uploaded: # process scale: [200, 300] # # def scale(width, height) # # do something # end # Create different versions of your uploaded files: # version :thumb do # process resize_to_fit: [50, 50] # end # Add a white list of extensions which are allowed to be uploaded. # For images you might use something like this: # def extension_whitelist # %w(jpg jpeg gif png) # end # Override the filename of the uploaded files: # Avoid using model.id or version_name here, see uploader/store.rb for details. # def filename # "something.jpg" if original_filename # end end
def create @user = User.new(user_params) if @user.save session[:user_id] = @user.id flash[:notice] = "ユーザー登録が完了しました" redirect_to posts_url else render 'new' end end def user_params params.require(:user).permit(:name,:password,:password_confirmation,:user_image) end
<%= form_with model: @user,local: true do |f| %> <%= f.file_field :user_image %> <%= f.submit "登録", class: "new-submit" %> <% end %>
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