ruby-on-rails - 在多部分simple_form中更新回形针头像

Question

我想为以下表单创建一个编辑页面。问题在于，当用户浏览到编辑页面时，brand_name和name被预先填充，但是即使“ style”的化身存在，图像上传字段也显示“ no selected selected”。请让我知道是否有某种方法可以解决此问题。谢谢！

我的编辑表单：

<%= simple_form_for @style, :html => { :class => 'form-horizontal' }, :remote => true do |m| %>

    <%= m.input :brand_name, :label => 'Brand', :placeholder => 'Brand' %>    
    <%= m.input :name, :label => 'Style', :placeholder => 'Style' %>
    <%= m.input :avatar, :label => "Image" %>

    <div class="form-actions" style = "background:none">
      <%= m.submit nil, :class => 'btn btn-primary' %>
      <%= link_to 'Cancel', styles_path, :class => 'btn' %>
    </div>

<% end %>

Answer 1

昨天才实施。在/ app / inputs中进行自定义输入

class AvatarInput < SimpleForm::Inputs::FileInput
def input
out = '' # the output string we're going to build
# check if there's an uploaded file (eg: edit mode or form not saved)
if object.send("#{attribute_name}?")
  # append preview image to output
  # <%= image_tag @user.avatar.url(:thumb), :class => 'thumbnail', id: 'avatar' %>
  out << template.image_tag(object.send(attribute_name).url(:thumb), :class => 'thumbnail', id: 'avatar')
  end
# append file input. it will work accordingly with your simple_form wrappers
    (out << @builder.file_field(attribute_name, input_html_options)).html_safe
  end
end

那你可以做

<%= f.input :avatar, :as => :avatar %>