I have a scenario that my user need to upload a image first and then
assign to another model, so I used a generic model, to upload the file
first. But I always get a exception of
ActiveRecord::UnknownAttributeError (unknown attribute: utf8). because
rails automatically adds a utf-8 field for the form submit.
model:
<code>
class AttachedImage < ActiveRecord::Base
belongs_to :attachable, :polymorphic => true
has_attached_file :image
end
</code>
migration:
<code>
class CreateAttachedImages < ActiveRecord::Migration
def change
create_table :attached_images do |t|
t.string :image_file_name
t.string :image_content_type
t.integer :image_file_size
t.datetime :image_updated_at
t.references :attachable, :polymorphic => true
t.timestamps
end
end
end
</code>
And the controller:
<code>
class AttachedImagesController < ApplicationController
def create
@attched_image = AttachedImage.new(params)
respond_to do |format|
if @attched_image.save
format.js
else
format.js
end
end
end
end
</code>
the view part:
<code>
<div id="upload-image-dialog">
<%= form_tag(@attached_image, :method => "POST", :remote => true,
:html => { :multipart => true }) do %>
<%= file_field_tag :image %>
<%= submit_tag("submit") %>
<% end %>
<h1 style="display:none">Successfully Uploaded.</h1>
</div>
</code>
it's quite straight forward, but every time I submit this form, I will
get an exception of the utf8 field added automatically by rails.
ActiveRecord::UnknownAttributeError (unknown attribute: utf8):
app/controllers/attached_images_controller.rb:5:in `new'
app/controllers/attached_images_controller.rb:5:in `create'
I could not understand that, this shall not be a problem right? We are
writing @model = Model.new(params) everyday, hope someone could help me
out and explain what's going on under the hood, thanks!
--
Posted via http://www.ruby-forum.com/.
--
You received this message because you are subscribed to the Google Groups "Ruby
on Rails: Talk" group.
To post to this group, send email to [email protected].
To unsubscribe from this group, send email to
[email protected].
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en.
