问题
I'm following railscasts episode 381 in an attempt to allow multiple image uploads to my app with the carrierwave gem & jQuery File upload.
My app is for a college project & is set up with a hikingtrails model which has many & accepts nested attributes for a pics model.
After I set the multiple option of the file_field to true & hard-coding the input name attribute i.e. <%= form.file_field :image, multiple: true, name: "pic[image]" %>, carrierwave stops working, it doesn't upload a single file as it did before.
Could this have something to do with using nested forms? I've also tried implementing this tutorial into my app without any success.
I've also tried making both forms multi part rather than just the parent form & removing the simple_form gem that I'm using.
I've also tried removing the form partial & putting the nested form in locally but that didn't help. Perhaps it has something to do with how I'm setting the file_field to multiple as this is where the issue began.
Any suggestions or an alternative approach would really be appreciated
Models
class Pic < ActiveRecord::Base
belongs_to :hikingtrail
attr_accessible :img_name, :image, :remote_image_url
mount_uploader :image, ImageUploader
end
&
class Hikingtrail < ActiveRecord::Base
attr_accessible :description,
:duration_hours,
:duration_mins,
:meta_description,
:name,
:looped,
:pics_attributes
validates :name, :presence => true
has_many :pics
accepts_nested_attributes_for :pics, :allow_destroy => :true,
:reject_if => proc { |attrs| attrs.all? { |k, v| v.blank? } }
end
Views
hikingtrails/_form.html.erb
<% @hikingtrail.pics.build %>
<%= simple_form_for @hikingtrail, :html => {:multipart => true} do |f| %>
<%= f.input :name %>
<%= f.input :description, :input_html => { :cols => 10, :rows => 3 } %>
<%= f.input :looped %>
<h2>Images</h2>
<%= render :partial => 'pics/form',
:locals => {:form => f} %>
<div class="form-actions">
<%= f.submit nil, :class => 'btn btn-primary' %>
<%= link_to t('.cancel', :default => t("helpers.links.cancel")),
hikingtrails_path, :class => 'btn' %>
</div>
<% end %>
pics/_form.html.erb
<%= form.fields_for :pics do |pic_form| %>
<div class="field">
<% unless pic_form.object.nil? || pic_form.object.new_record? %>
<%= image_tag pic_form.object.image_url(:thumb).to_s %>
<% end %>
<% if pic_form.object.nil? || pic_form.object.new_record? %>
<%= pic_form.file_field :image, multiple: true, name: "pic[image]" %>
<% end %>
</div>
<% unless pic_form.object.nil? || pic_form.object.new_record? %>
<div class="field">
<%= pic_form.label :_destroy, 'Remove:' %>
<%= pic_form.check_box :_destroy %>
</div>
<% end %>
<% end %>
Terminal Output
Started PUT "/hikingtrails/7" for 127.0.0.1 at 2013-03-24 13:55:17 +0000
Processing by HikingtrailsController#update as HTML
Parameters: {"utf8"=>"✓", "authenticity_token"=>"trGCi0Gz+CNRmwAoktcYmeplEKW5bZBtozkduNIXvcI=", "hikingtrail"=>{"name"=>"Dunran Woods", "meta_description"=>"Nice walk through the woods", "description"=>"Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.", "looped"=>"0", "duration_hours"=>"9", "duration_mins"=>"45"}, "pic"=>{"image"=>#<ActionDispatch::Http::UploadedFile:0x007f288085cc08 @original_filename="spink_sleepers.jpg", @content_type="image/jpeg", @headers="Content-Disposition: form-data; name=\"pic[image]\"; filename=\"spink_sleepers.jpg\"\r\nContent-Type: image/jpeg\r\n", @tempfile=#<File:/tmp/RackMultipart20130324-7791-19ma2cb>>}, "commit"=>"Update Hikingtrail", "id"=>"7"}
Hikingtrail Load (3.7ms) SELECT "hikingtrails".* FROM "hikingtrails" WHERE "hikingtrails"."id" = $1 LIMIT 1 [["id", "7"]]
(0.1ms) BEGIN
(0.1ms) COMMIT
Redirected to http://0.0.0.0:3000/hikingtrails/7
Completed 302 Found in 6ms (ActiveRecord: 3.8ms)
Started GET "/hikingtrails/7" for 127.0.0.1 at 2013-03-24 13:55:17 +0000
Processing by HikingtrailsController#show as HTML
Parameters: {"id"=>"7"}
Hikingtrail Load (3.4ms) SELECT "hikingtrails".* FROM "hikingtrails" WHERE "hikingtrails"."id" = $1 LIMIT 1 [["id", "7"]]
Pic Load (0.2ms) SELECT "pics".* FROM "pics" WHERE "pics"."hikingtrail_id" = 7
Rendered collection (0.0ms)
Rendered hikingtrails/show.html.erb within layouts/application (2.6ms)
Rendered layouts/_navbar.html.erb (0.9ms)
Rendered layouts/_footer.html.erb (0.3ms)
Completed 200 OK in 41ms (Views: 36.2ms | ActiveRecord: 3.7ms)
Started GET "/assets/application.css?body=1" for 127.0.0.1 at 2013-03-24 13:55:17 +0000
Served asset /application.css - 304 Not Modified (0ms)
[2013-03-24 13:55:17] WARN Could not determine content-length of response body. Set content-length of the response or set Response#chunked = true
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Served asset /bootstrap_and_overrides.css - 304 Not Modified (0ms)
[2013-03-24 13:55:17] WARN Could not determine content-length of response body. Set content-length of the response or set Response#chunked = true
Started GET "/assets/jquery-fileupload/vendor/jquery.ui.widget.js?body=1" for 127.0.0.1 at 2013-03-24 13:55:17 +0000
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Served asset /jquery.js - 304 Not Modified (0ms)
[2013-03-24 13:55:17] WARN Could not determine content-length of response body. Set content-length of the response or set Response#chunked = true
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[2013-03-24 13:55:17] WARN Could not determine content-length of response body. Set content-length of the response or set Response#chunked = true
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Served asset /twitter/bootstrap/bootstrap-transition.js - 304 Not Modified (0ms)
Started GET "/assets/jquery-fileupload/jquery.fileupload.js?body=1" for 127.0.0.1 at 2013-03-24 13:55:17 +0000
Served asset /jquery-fileupload/jquery.fileupload.js - 304 Not Modified (0ms)
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[2013-03-24 13:55:17] WARN Could not determine content-length of response body. Set content-length of the response or set Response#chunked = true
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[2013-03-24 13:55:18] WARN Could not determine content-length of response body. Set content-length of the response or set Response#chunked = true
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[2013-03-24 13:55:18] WARN Could not determine content-length of response body. Set content-length of the response or set Response#chunked = true
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[2013-03-24 13:55:18] WARN Could not determine content-length of response body. Set content-length of the response or set Response#chunked = true
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[2013-03-24 13:55:18] WARN Could not determine content-length of response body. Set content-length of the response or set Response#chunked = true
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Started GET "/assets/pics.js?body=1" for 127.0.0.1 at 2013-03-24 13:55:18 +0000
Served asset /pics.js - 304 Not Modified (0ms)
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回答1:
I spent a long time trying to implement something similar. Perhaps my answer on this post may help you.
Rails 3 + JQuery-File-Upload + Nested Model
回答2:
I never found a solution to uploading multiple images in a nested form with the jQuery file upload. After all the research I've done I don't think it is posible.
In the end I followed railscast #196 & was able to upload multiple images at a time with carrierwave & javascript.
来源：https://stackoverflow.com/questions/15599613/multiple-image-uploads-in-a-nested-form-with-carrierwave