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Bo Zhao

2012-Jan-30 06:51 UTC

how to use Paperclip alone with a separated attachment model

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!

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Prince Joseph

2012-Jan-30 07:43 UTC

head link

Re: how to use Paperclip alone with a separated attachment model

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
<lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org> 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
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
> To unsubscribe from this group, send email to
>
rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
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> http://groups.google.com/group/rubyonrails-talk?hl=en.
>
>

-- 
Thanks,
Prince

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subbarao

2012-Jan-30 13:26 UTC

head link

Re: how to use Paperclip alone with a separated attachment model

On Monday 30 January 2012 12:21 PM, Bo Zhao 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!
>change in the controller

@attched_image = AttachedImage.new(params)

to

@attched_image = AttachedImage.new(params[:attached_image])


if above not working because of form_tag usage

then you have to use custom new like

@attched_image = AttachedImage.new(:image=>params[:image])

this should work.







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Rails - Jan 2012 - how to use Paperclip alone with a separated attachment model

how to use Paperclip alone with a separated attachment model

Re: how to use Paperclip alone with a separated attachment model

Re: how to use Paperclip alone with a separated attachment model