避免使用 fields_for 将单个记录添加到关联模型
我有以下关联：
class Developer < ActiveRecord::Base
has_many :large_photos, :class_name => 'Photo', :conditions => { :large => true }, :reject_if => proc { |x| x['image'].blank? }
end
class Photo < ActiveRecord::Base
belongs_to :developer
mount_uploader :image, ImageUploader # Carrierwave
end
现在，我正在构建一个开发表单，提交后，将添加一个文件字段来上传新的照片。目前我有：
<%= form_for @developer do |form| %>
<%= form.fields_for :large_photos do |sf| %>
<div class="dropzone">
<%= sf.file_field :image %>
<%= sf.hidden_field :large, :value => '1' %>
<%= sf.hidden_field :image_cache %>
</div>
<% end %>
<% end%>
现在，我遇到的问题是 fields_for 正在循环遍历现有记录（当然是这样！），我希望避免这种情况，我只想添加用于上传新照片的单个文件字段。我该怎么办呢？
I have the following associations:
class Developer < ActiveRecord::Base
has_many :large_photos, :class_name => 'Photo', :conditions => { :large => true }, :reject_if => proc { |x| x['image'].blank? }
end
class Photo < ActiveRecord::Base
belongs_to :developer
mount_uploader :image, ImageUploader # Carrierwave
end
Now, I'm looking to build a Development form which, when submitted, will add a single file field for uploading a new Photo. At the moment I have:
<%= form_for @developer do |form| %>
<%= form.fields_for :large_photos do |sf| %>
<div class="dropzone">
<%= sf.file_field :image %>
<%= sf.hidden_field :large, :value => '1' %>
<%= sf.hidden_field :image_cache %>
</div>
<% end %>
<% end%>
Now, the problem I have with this is that fields_for is looping through the existing records (of course it is!) which I'd prefer to avoid, I just want to add a single file field for uploading a new photo. How would I go about this?
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此行不是为每张现有照片创建字段，而是构建一个新的
Photo并仅显示该照片的字段（因此字段为空，我认为这就是您想要的）。Instead of creating the fields for each existing photos, this line builds a new
Photoand show the fields only for this one (so the fields are empty, I think it's what you want).