Question

用户创建个人资料并上传头像....没关系。但随后用户决定添加更多信息，以便第二次访问配置文件设置并仅更改一个或两个文本字段但不更改头像。但保存更改后，头像消失了。如果它没有改变，我希望它留在那里。

验证，如果未选择头像，则参数不允许，似乎没有任何帮助。

编辑：添加一些代码

blog.rb模型：

mount_uploader :blog_title_img, BlogTitleUploader

blog_title_uploader.rb：

 class BlogTitleUploader < CarrierWave::Uploader::Base

  include CarrierWave::MiniMagick

  def extension_white_list
    %w(jpg jpeg gif png)
  end

  storage :file

  kvalita = 90

  def store_dir
    "uploads/#{model.class.to_s.underscore}/#{model.id}/#{mounted_as}"
  end

  version :thumb464 do
      process :resize_to_fill => [464,304]
      process :convert => 'jpg'
      process :quality => kvalita
  end

  version :thumb340, from_version: :thumb464  do
      process :resize_to_fill => [340,304]
      process :convert => 'jpg'
      process :quality => kvalita
  end

  version :thumb320, from_version: :thumb464 do
      process :resize_to_fill => [320,200]
      process :convert => 'jpg'
      process :quality => kvalita
  end

  version :thumb288, from_version: :thumb464 do
      process :resize_to_fill => [288,304]
      process :convert => 'jpg'
      process :quality => kvalita
  end

  version :thumb256, from_version: :thumb464 do
      process :resize_to_fill => [256,304]
      process :convert => 'jpg'
      process :quality => kvalita
  end

  version :thumb224, from_version: :thumb464 do
      process :resize_to_fill => [224,304]
      process :convert => 'jpg'
      process :quality => kvalita
  end

  def filename
    "#{secure_token()}.jpg"
  end

  def secure_token(length=16)
    var = :"@#{mounted_as}_secure_token"
    model.instance_variable_get(var) or model.instance_variable_set(var, SecureRandom.hex(length/2))
  end


end

博客/ edit.html.erb：

<%= 

render partial: "shared/editor",
object: @blog,
locals: { 
    backlink: @backlink, 
    title_image: :blog_title_img
}

%>

共享/ _editor.html.erb：

<%= form_for editor do |f| %>
    <b>Nadpis</b>
    <br>
    <%= f.text_field :title, class:"nadpis" %>
    <br>
    <b>Link</b>
    <br>
    <%= f.text_field :link, class:"nadpis" %>
    <% if defined?(editor.tags) %>
        <br>
        <b>Tagy</b>
        <br>
        <%= f.text_field :tags, class:"nadpis" %>
    <% end %>
    <br>
    <b>Úvodný text / popis</b>
    <br>
    <%= f.text_area :description, class:"nadpis" %>
    <br>
    <b>Text</b>
    <br>
    <%= f.text_area :text, class:"text" %>
    <br>
    <b>Titulný obrázok</b>
    <br>
    <%= image_tag(editor.send(title_image).thumb320.url) if editor.send(title_image) != nil %>
    <br>
    <%= f.file_field title_image %>
    <br>
    <%= f.hidden_field title_image.to_s + "_cache" %>
    <br>
    <% if defined?(kategorie) #&& z.length > 0
        z = kategorie.reflections[kategorie.reflections.keys.first].active_record.all
        z.each do |ch| %>
            <span>
                <%= check_box "pica", :id, { multiple: true, checked: in_result_set(kategorie, ch) }, ch.id, nil %>
                <%= ch.title %>
            </span>
        <% end %>
        <br>
    <% end %>
    <%= f.radio_button :visible, true %> Publikovať po odoslaní
    <br>
    <%= f.radio_button :visible, false %> Zatiaľ nepublikovať
    <br>
    <br>
    <%= f.hidden_field :typ, value: params[:typ] %>
    <%= f.submit "Uložiť" %>
<% end %>

Answer 1

对于有类似问题的未来访客，我终于找到了解决方案：

在blog_title_uploader.rb中更改：

def filename
    "#{secure_token()}.jpg" 
end

为：

def filename
    "#{secure_token()}.jpg" if original_filename.present?
end

现在页面的行为符合要求。我应该尽量控制输出并分析它在幕后做的事情......

解决方案取自此处：Carrierwave filename keeps changing on update_attributes

carrierwave删除用户个人资料更新时的用户头像

1 个答案: