LinkedInBahhh! When you update a model that contains an empty file field in Rails 2.3 the attachment is deleted. It looks like empty file fields get passed as nil and then Paperclip gets angry.
Processing Admin::PostsController#update (for 127.0.0.1 at 2009-03-05 01:21:08) [PUT]
Parameters: {"commit"=>"Update", "post"=>{"title"=>"Post Title", "image"=>nil}, "id"=>"124"}
Parameters: {"commit"=>"Update", "post"=>{"title"=>"Post Title", "image"=>nil}, "id"=>"124"}
There are two quick monkey patches that I’ve been using, the first, was splitting off attachments to their own method (edit_attachment)…but this quickly became a nuisance. A quicker work around is to remove the attachment field, in this case “image”, from the parameters.
# PUT /posts/1
# PUT /posts/1.xml
def update
@post = Post.find(params[:id])
# delete the offending parameter
params[:post].delete(:image) if params[:post][:image].nil?
respond_to do |format|
if @post.update_attributes(params[:post])
flash[:notice] = 'Post was successfully updated.'
format.html { redirect_to(admin_post_url(@post)) }
else
format.html { render :action => "edit" }
end
end
end
# PUT /posts/1.xml
def update
@post = Post.find(params[:id])
# delete the offending parameter
params[:post].delete(:image) if params[:post][:image].nil?
respond_to do |format|
if @post.update_attributes(params[:post])
flash[:notice] = 'Post was successfully updated.'
format.html { redirect_to(admin_post_url(@post)) }
else
format.html { render :action => "edit" }
end
end
end