send_data @picture.data_file.data, :filename => @picture.filename,
:type => @picture.content_type, :dispo sition => ‘inline’
Shouldn’t that be db_file, not data_file?
OOps. yes. But that just gets me to a different error message:
You have a nil object when you didn’t expect it!
The error occured while evaluating nil.data
And while trying to double check that I had not messed anything up, I
am reminded that to get
as far as I did, I had had to comment out another piece of code that
was causing errors. So for a full recap:
I have Rails 1.1.6 installed on a RHEL 4 system running ruby 1.8.4
(installed from source). I installed acts_as_attachment using the
command “script/plugin install
http://svn.techno-weenie.net/projects/plugins/tags/acts_as_attachment-1.1.6”
If I set the DB environment variable, running the test “rake
test_plugins PLUGIN=acts_as_attachment” seems to work - but I had
expected more output - such as a list of # of tests and # passed.
If I set my Picture model up to use :storage => :file_system, all
seems to work just fine. To try to use :db_system, I needed to
uncomment the lines about db_file before running the migration built
when I did “script/generate attachment_model picture”. Then I set up
my model up like:
class Picture < ActiveRecord::Base
acts_as_attachment :storage => :db_system, :max_size =>
500.kilobytes, :content_type => :image
validates_as_attachment
end
and my controller like this:
class PictureController < ApplicationController
def index
@pictures = Picture.find(:all)
end
def new
@picture = Picture.new
end
def show
@picture = Picture.find(params[:id])
send_data @picture.db_file.data, :filename => @picture.filename,
:type => @picture.content_type, :disposition => ‘inline’
end
def create
@picture = Picture.create params[:picture]
redirect_to :action => ‘show’, :id => @picture
rescue ActiveRecord::RecordInvalid
render :action => ‘new’
end
end
When I try to upload a new image, I can see the following exception:
undefined method `db_file_id=’ for #Picture:0xb77f83fc
RAILS_ROOT: /rails/admissions/script/…/config/…
Application Trace | Framework Trace | Full Trace
/software/stow/ruby-1.8.4/lib/ruby/gems/1.8/gems/activerecord-1.14.3/lib/active_record/base.rb:1789:in
method_missing' #{RAILS_ROOT}/vendor/plugins/acts_as_attachment-1.1.6/lib/technoweenie/acts_as_attachment.rb:316:in save_to_storage’
/software/stow/ruby-1.8.4/lib/ruby/gems/1.8/gems/activerecord-1.14.3/lib/active_record/callbacks.rb:333:in
callback' /software/stow/ruby-1.8.4/lib/ruby/gems/1.8/gems/activerecord-1.14.3/lib/active_record/callbacks.rb:330:in callback’
/software/stow/ruby-1.8.4/lib/ruby/gems/1.8/gems/activerecord-1.14.3/lib/active_record/callbacks.rb:248:in
create_or_update' /software/stow/ruby-1.8.4/lib/ruby/gems/1.8/gems/activerecord-1.14.3/lib/active_record/base.rb:1392:in save_without_validation’
/software/stow/ruby-1.8.4/lib/ruby/gems/1.8/gems/activerecord-1.14.3/lib/active_record/validations.rb:724:in
save_without_transactions' /software/stow/ruby-1.8.4/lib/ruby/gems/1.8/gems/activerecord-1.14.3/lib/active_record/transactions.rb:126:in save’
/software/stow/ruby-1.8.4/lib/ruby/gems/1.8/gems/activerecord-1.14.3/lib/active_record/connection_adapters/abstract/database_statements.rb:51:in
transaction' /software/stow/ruby-1.8.4/lib/ruby/gems/1.8/gems/activerecord-1.14.3/lib/active_record/transactions.rb:91:in transaction’
/software/stow/ruby-1.8.4/lib/ruby/gems/1.8/gems/activerecord-1.14.3/lib/active_record/transactions.rb:118:in
transaction' /software/stow/ruby-1.8.4/lib/ruby/gems/1.8/gems/activerecord-1.14.3/lib/active_record/transactions.rb:126:in save’
/software/stow/ruby-1.8.4/lib/ruby/gems/1.8/gems/activerecord-1.14.3/lib/active_record/base.rb:408:in
create' #{RAILS_ROOT}/app/controllers/picture_controller.rb:16:in create’
In the module DbFileMethods section of acts_as_attachment.rb, I
commented out the line that calls db_file_id= and then I can upload
files. I see the insert statements for both db_files and pictures and
looking in the database, I see roughly the data I expect (Can’t easily
inspect the image from the terminal, but it is of the same length as
the length stored in pictures.size. But when I try to use the show
method above, I get the nil.data error at the top of this post. And I
am having trouble working backwards from the only code that seems it
ties pictures to db_files to the syntax I need in my show controller
so I can display the images right out of the database. Is this the
code that tells the the two tables they are related?
module DbFileMethods def self.included(base) #:nodoc:
base.belongs_to :db_file
base.before_save :save_to_storage # so the db_file_id can be set
end
And I would have expected one or the other table to have a foreign
key. What am I missing?
–
Cynthia K.
[email protected]