Problem is here, in this line of code: @attched_image = AttachedImage.new(params)
It should be: @attched_image = AttachedImage.new(params[:attached_image]) On Mon, Jan 30, 2012 at 12:21 PM, Bo Zhao <[email protected]> wrote: > 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. > > -- Thanks, Prince -- 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.
