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.