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我有一个可能包含许多文件的对象的嵌套表单。我在创建对象时没有问题，但是当我需要编辑它时，我发现了问题，表单应该有文件 url 的链接，但我不知道如何引用文件本身。我用回形针。在这种情况下，如果只有一个文件并且它在对象模型中，我会做类似@object.file.url 但由于有很多文件，我不知道在这种情况下如何进行......

编辑.html.haml

= form_for @object, :url => { :action => "update", :controller => "object", :id => @object.id, :method => "post" }, :html => { :multipart => true }  do |f|

  - render "object/object_form", object: f.object, f: f

object_form.html.haml

.field
  = f.label :name
  = f.text_field :name

= f.fields_for :files do |builder|
  = render 'object/file_fields', :f => builder
%p= link_to_add_fields "Add new file", f, :file

.field
  = f.submit "Save"

file_fields.html.haml

%fieldset
  .field
    = f.label :file
    = f.file_field :file
  .field
    = f.hidden_field :_destroy
    = link_to "Remove File", '#', class: "remove_fields"

我正在尝试做的事情显然在 file_fields.html.haml 中不起作用

%fieldset
  .field
    = f.label :file
    = f.file_field :file
    = link_to f.file.url 
  .field
    = f.hidden_field :_destroy
    = link_to "Remove File", '#', class: "remove_fields"
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1 回答 1

1

我认为你应该能够做到

f.object.url

所以：

%fieldset
  .field
    = f.label :file
    = f.file_field :file
    # Not sure if it would produce a Nil error on the new form.
    # given how the f object wouldn't yet have a url
    - if f.object.url
       = link_to f.object.url 
  .field
    = f.hidden_field :_destroy
    = link_to "Remove File", '#', class: "remove_fields"
于 2013-03-26T23:42:01.447 回答