Rails - Feb 2009 - undefined method `content_type' when editing already-uploaded items (attachment_fu)

My project is for a photographer''s portfolio.  He''s allowed to
upload
photographs, which are then displayed on the site.  I''m using
attachment_fu.  All of this works fine.

Where I''m running into problems is in allowing him to edit the
photographs'' attributes later.

Example:
I''ve uploaded a picture of a spider.  During the upload I enter the
title as "spider 1".  Great, the photo uploads, and if I go to to
admin/index, there it is.  Glorious.  But oops!  I forgot to
capitalize my title!  So I head to admin/edit/:photo_id, a form
displays, and I correct my mistake.  Then I click Update.  And oh
no.  :(

NoMethodError in AdminController#update

undefined method `content_type'' for #<Photo:0xb67ffbf0>

I''ve been working on this problem for a while now.  Commenting out
everything attachment_fu related in my Photos model is the only way I
can make the edit form work (which of course breaks uploading).

Here is all relevant code:

models/photo.rb:

    class Photo < ActiveRecord::Base

 
attr_accessible :title, :description, :camera, :time, :date, :iso, :lens,
                      :focal_length, :exposure, :aperture

      has_attachment :content_type => :image,
                     :storage => :file_system,
                     :path_prefix => ''public/photos'',
                     :thumbnails => { :thumb =>
''320x200>'' }
      validates_as_attachment
      validates_uniqueness_of :filename

      def full_filename(thumbnail = nil)
        file_system_path = (thumbnail ? thumbnail_class :
self).attachment_options[:path_prefix].to_s
        File.join(RAILS_ROOT, file_system_path, thumbnail_name_for
(thumbnail))
      end

      def exifize(photo)
        require ''mini_exiftool''
        @photo = photo
        @exif = MiniExiftool.new "public/photos/#{ @photo.filename }"
        @photo.camera = @exif.model
        @photo.time = @exif.datetimeoriginal.strftime(''%I:%M
%p'')
        @photo.date = @exif.datetimeoriginal.strftime(''%B %d,
%Y'')
        @photo.iso = @exif.iso
        @photo.lens = @exif.lens
        @photo.focal_length = @exif.focal_length
        @photo.aperture = @exif.aperture
        @photo.save
      end
    end

controllers/admin_controller.rb:

    def new
      @photo = Photo.new(params[:photo])
    end

    def create
      @photo = Photo.new(params[:photo])
      @photo.exifize(:photo)
      @photo.save
      if @photo.save
        flash[:notice] = ''Yay!''
        redirect_to :controller => ''admin'', :action =>
:index
      else
        flash[:error] = ''boo...''
        redirect_to :controller => ''admin'', :action =>
:error
      end
    end

views/admin/edit.html.erb:

    <% form_for :photo, :url => { :controller =>
''admin'',
                                  :action => ''update'',
                                  :id => @photo } do |f| %>

      <p>
        <%= f.label :title %><br />
        <%= f.text_field :title %>
      </p>
      <p>
        <%= f.label :description %><br />
        <%= f.text_area :description %>
      </p>
      <p>
        <%= f.label :camera %><br />
        <%= f.text_field :camera %>
      </p>

      ...etc...

      <p>
        <%= f.submit "Update" %>
      </p>
    <% end %>

I''m lost.  Please help.

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Reading documentation thoroughly is always good.  A member of
#rubyonrails on freenode helped me out.  Since uploading worked fine,
I didn''t think to check my model.  I had neglected to add the
content_type column.  Oops.

On Feb 18, 8:16 pm, lostsync
<lost.s...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> My project is for a photographer''s portfolio.  He''s
allowed to upload
> photographs, which are then displayed on the site.  I''m using
> attachment_fu.  All of this works fine.
>
> Where I''m running into problems is in allowing him to edit the
> photographs'' attributes later.
>
> Example:
> I''ve uploaded a picture of a spider.  During the upload I enter
the
> title as "spider 1".  Great, the photo uploads, and if I go to to
> admin/index, there it is.  Glorious.  But oops!  I forgot to
> capitalize my title!  So I head to admin/edit/:photo_id, a form
> displays, and I correct my mistake.  Then I click Update.  And oh
> no.  :(
>
> NoMethodError in AdminController#update
>
> undefined method `content_type'' for #<Photo:0xb67ffbf0>
>
> I''ve been working on this problem for a while now.  Commenting out
> everything attachment_fu related in my Photos model is the only way I
> can make the edit form work (which of course breaks uploading).
>
> Here is all relevant code:
>
> models/photo.rb:
>
>     class Photo < ActiveRecord::Base
>
> attr_accessible :title, :description, :camera, :time, :date, :iso, :lens,
>                       :focal_length, :exposure, :aperture
>
>       has_attachment :content_type => :image,
>                      :storage => :file_system,
>                      :path_prefix => ''public/photos'',
>                      :thumbnails => { :thumb =>
''320x200>'' }
>       validates_as_attachment
>       validates_uniqueness_of :filename
>
>       def full_filename(thumbnail = nil)
>         file_system_path = (thumbnail ? thumbnail_class :
> self).attachment_options[:path_prefix].to_s
>         File.join(RAILS_ROOT, file_system_path, thumbnail_name_for
> (thumbnail))
>       end
>
>       def exifize(photo)
>         require ''mini_exiftool''
>         @photo = photo
>         @exif = MiniExiftool.new "public/photos/#{ @photo.filename
}"
>         @photo.camera = @exif.model
>         @photo.time = @exif.datetimeoriginal.strftime(''%I:%M
%p'')
>         @photo.date = @exif.datetimeoriginal.strftime(''%B %d,
%Y'')
>         @photo.iso = @exif.iso
>         @photo.lens = @exif.lens
>         @photo.focal_length = @exif.focal_length
>         @photo.aperture = @exif.aperture
>         @photo.save
>       end
>     end
>
> controllers/admin_controller.rb:
>
>     def new
>       @photo = Photo.new(params[:photo])
>     end
>
>     def create
>       @photo = Photo.new(params[:photo])
>       @photo.exifize(:photo)
>       @photo.save
>       if @photo.save
>         flash[:notice] = ''Yay!''
>         redirect_to :controller => ''admin'', :action
=> :index
>       else
>         flash[:error] = ''boo...''
>         redirect_to :controller => ''admin'', :action
=> :error
>       end
>     end
>
> views/admin/edit.html.erb:
>
>     <% form_for :photo, :url => { :controller =>
''admin'',
>                                   :action => ''update'',
>                                   :id => @photo } do |f| %>
>
>       <p>
>         <%= f.label :title %><br />
>         <%= f.text_field :title %>
>       </p>
>       <p>
>         <%= f.label :description %><br />
>         <%= f.text_area :description %>
>       </p>
>       <p>
>         <%= f.label :camera %><br />
>         <%= f.text_field :camera %>
>       </p>
>
>       ...etc...
>
>       <p>
>         <%= f.submit "Update" %>
>       </p>
>     <% end %>
>
> I''m lost.  Please help.
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