Undefined method `has_attached_file' with paperclip 2.3.8 gem for Rails 2 using Ruby 1.8.7

Hello,

I am trying to use the paperclip plugin in my rails app to upload images
for posts. I am using Rails 2.0.2 and ruby 1.8.7 on Ubuntu 10.04 os for
project specific purposes.

I am referring to the following tutorials for this :-

  1. http://railscasts.com/episodes/134-paperclip?view=comments

http://jimneath.org/2008/04/17/paperclip-attaching-files-in-rails.html

I did a git clone on the paperclip plugin via:-
https://github.com/thoughtbot/paperclip , but the command like ruby script/generate paperclip group_post photo didn’t generate a migration
for it. I then created a migration for the same through ruby
script/generate and uploaded the appropriate columns of my table
group_posts.

I then tried to install the gem and since I am using activerecord and
activesupport 2.0.2 I used paperclip 2.3.8 gem from rubygems.org.The
undefined method error still persisted, I really couldn’t figure out
why.

Now here… the command ruby script/generate paperclip group_post photo worked perfectly fine for me.

The current error I am getting exactly looks like this:-

undefined method `has_attached_file' for #<Class:0xb67119f0>

A funny thing that I observed wrt this behavior was when I made use of
IRB, require ‘paperclip’ returned true but I wonder why they can’t
detect the method that comes along with the plugin in my rails app.

The Application Trace for the same is:-

/home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/activerecord-2.0.2/lib/active_record/base.rb:1532:in

method_missing_without_paginate' vendor/plugins/will_paginate/lib/will_paginate/finder.rb:170:inmethod_missing’
app/models/group_post.rb:9
app/controllers/groups_controller.rb:27:in `show’

The Full Trace for this just in case is:-

/home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/activerecord-2.0.2/lib/active_record/base.rb:1532:in

method_missing_without_paginate' vendor/plugins/will_paginate/lib/will_paginate/finder.rb:170:inmethod_missing’
app/models/group_post.rb:9
/home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:203:in
load_without_new_constant_marking' /home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:203:inload_file’
/home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:342:in
new_constants_in' /home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:202:inload_file’
/home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:94:in
require_or_load' /home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:248:inload_missing_constant’
/home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:453:in
const_missing_not_from_s3_library' /home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/aws-s3-0.6.2/lib/aws/s3/extensions.rb:206:inconst_missing’
/home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:465:in
const_missing' /home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:471:insend’
/home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:471:in
const_missing' app/controllers/groups_controller.rb:27:inshow’
/home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/actionpack-2.0.2/lib/action_controller/base.rb:1158:in
send' /home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/actionpack-2.0.2/lib/action_controller/base.rb:1158:inperform_action_without_filters’
/home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/actionpack-2.0.2/lib/action_controller/filters.rb:697:in
call_filters' /home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/actionpack-2.0.2/lib/action_controller/filters.rb:689:inperform_action_without_benchmark’
/home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/actionpack-2.0.2/lib/action_controller/benchmarking.rb:68:in
perform_action_without_rescue' /home/mohnish/.rvm/rubies/ruby-1.8.7-p334/lib/ruby/1.8/benchmark.rb:293:inmeasure’
/home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/actionpack-2.0.2/lib/action_controller/benchmarking.rb:68:in
perform_action_without_rescue' /home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/actionpack-2.0.2/lib/action_controller/rescue.rb:199:inperform_action_without_caching’
/home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/actionpack-2.0.2/lib/action_controller/caching.rb:678:in
perform_action' /home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/activerecord-2.0.2/lib/active_record/connection_adapters/abstract/query_cache.rb:33:incache’
/home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/activerecord-2.0.2/lib/active_record/query_cache.rb:8:in
cache' /home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/actionpack-2.0.2/lib/action_controller/caching.rb:677:inperform_action’
/home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/actionpack-2.0.2/lib/action_controller/base.rb:524:in
send' /home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/actionpack-2.0.2/lib/action_controller/base.rb:524:inprocess_without_filters’
/home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/actionpack-2.0.2/lib/action_controller/filters.rb:685:in
process_without_session_management_support' /home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/actionpack-2.0.2/lib/action_controller/session_management.rb:123:inprocess_without_test’
/home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/actionpack-2.0.2/lib/action_controller/test_process.rb:15:in
process' /home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/actionpack-2.0.2/lib/action_controller/base.rb:388:inprocess’
/home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/actionpack-2.0.2/lib/action_controller/dispatcher.rb:171:in
handle_request' /home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/actionpack-2.0.2/lib/action_controller/dispatcher.rb:115:indispatch’
/home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/actionpack-2.0.2/lib/action_controller/dispatcher.rb:126:in
dispatch_cgi' /home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/actionpack-2.0.2/lib/action_controller/dispatcher.rb:9:indispatch’
/home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/mongrel-1.1.5/lib/mongrel/rails.rb:76:in
process' /home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/mongrel-1.1.5/lib/mongrel/rails.rb:74:insynchronize’
/home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/mongrel-1.1.5/lib/mongrel/rails.rb:74:in
process' /home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/mongrel-1.1.5/lib/mongrel.rb:159:inprocess_client’
/home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/mongrel-1.1.5/lib/mongrel.rb:158:in
each' /home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/mongrel-1.1.5/lib/mongrel.rb:158:inprocess_client’
/home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/mongrel-1.1.5/lib/mongrel.rb:285:in
run' /home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/mongrel-1.1.5/lib/mongrel.rb:285:ininitialize’
/home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/mongrel-1.1.5/lib/mongrel.rb:285:in
new' /home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/mongrel-1.1.5/lib/mongrel.rb:285:inrun’
/home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/mongrel-1.1.5/lib/mongrel.rb:268:in
initialize' /home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/mongrel-1.1.5/lib/mongrel.rb:268:innew’
/home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/mongrel-1.1.5/lib/mongrel.rb:268:in
run' /home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/mongrel-1.1.5/lib/mongrel/configurator.rb:282:inrun’
/home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/mongrel-1.1.5/lib/mongrel/configurator.rb:281:in
each' /home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/mongrel-1.1.5/lib/mongrel/configurator.rb:281:inrun’
/home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/mongrel-1.1.5/bin/mongrel_rails:128:in
run' /home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/mongrel-1.1.5/lib/mongrel/command.rb:212:inrun’
/home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/mongrel-1.1.5/bin/mongrel_rails:281
/home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:489:in
load' /home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:489:inload’
/home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:342:in
new_constants_in' /home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:489:inload’
/home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/rails-2.0.2/lib/commands/servers/mongrel.rb:64
/home/mohnish/.rvm/rubies/ruby-1.8.7-p334/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in
gem_original_require' /home/mohnish/.rvm/rubies/ruby-1.8.7-p334/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:inrequire’
/home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:496:in
require' /home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:342:innew_constants_in’
/home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:496:in
require' /home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/rails-2.0.2/lib/commands/server.rb:39 /home/mohnish/.rvm/rubies/ruby-1.8.7-p334/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:ingem_original_require’
/home/mohnish/.rvm/rubies/ruby-1.8.7-p334/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in
`require’
script/server:3

My groups_controller.rb show method looks like this, here line 27 is
@group_post = GroupPost.new(params[:group_post]) :-

  def show
    @investor_group = InvestorGroup.find(params[:id])
    @members = @investor_group.activated_members
    # code taken from discuss method
    investor_id = session['investor_id']
    @investor = Investor.find(investor_id)

    @members = @investor_group.activated_members

    unless

@current_user.is_an_existing_member_of_group(@investor_group)
flash[:notice] = “Please join this group to participate in
discussions”
redirect_to :action => :show, :id => @investor_group and
return
else
@group_post = GroupPost.new(params[:group_post]) # line 27,
tried GroupPost.create also… seems to be of no avail…
end
#@group_post = GroupPost.new(params[:group_post])
@group_post.investor_group_id = @investor_group.id
@group_post.post_by = investor_id
unless @group_post.message.blank?
if @group_post.save
flash[:notice] = ‘Post was successfull’
else
flash[:notice] = ‘Post was not successfull’
end
#redirect_to :action => :show, :id => @investor_group and
return to change… appropriately…
end
#if @group_post.message.blank?
# flash[:notice] = ‘Post can’t be blank.’
#end
@group_all_posts = GroupPost.find(:all, :conditions => [
‘investor_group_id = ?’, “#{@investor_group.id}” ], :order =>
‘created_at DESC’)
# code taken from discuss method
end

The group_post model looks like this with line 9 having the following
code has_attached_file :photo :-

class GroupPost < ActiveRecord::Base
has_many :group_comments
belongs_to :investor_group
validates_presence_of :message

#include Paperclip
require “paperclip”

Paperclip

has_attached_file :photo # line 9

end

Part of my view file where I am trying to upload the picture along with
a post looks like this:-

<%form_for  :group_post, @group_post, :url => {:action =>

:show},:html => {:multipart => ‘true’},:id => ‘new_post’ do |f| -%>

Start Discussion:
<%=f.text_field
:message%>


<%=f.file_field :photo%>

<%=submit_tag “Post”%>


<%end%>

I tried what was given in:-

This option didn’t seem applicable to my case as it seems to be using a
higher Rails version

I tried restarting my server, but it didn’t solve my problem;

I tried the include Paperclip - but it really didn’t seem to help my
case…

I have added a require in my group_post.rb and in my environment.rb file
as require “paperclip”. I still get an undefined method error. I don’t
know why…

On referring to this I tried Imumar’s fork of paperclip, I manually
pasted it in my vendor/plugins directory after git cloning it… I got
the following error( I have a feeling there surely would have been a
dependency issue as his version might be compatible only with a higher
rails version:

[email protected]:~/UP/dev$ ruby script/server -p 4000
=> Booting Mongrel (use 'script/server webrick' to force WEBrick)
=> Rails application starting on http://0.0.0.0:4000
=> Call with -d to detach
=> Ctrl-C to shutdown server
** Starting Mongrel listening at 0.0.0.0:4000
** Starting Rails with development environment...
Exiting
/home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:263:in

load_missing_constant': uninitialized constant Paperclip::CallbackCompatability::Rails20 (NameError) from /home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:453:inconst_missing’
from
/home/mohnish/UP/dev/vendor/plugins/paperclip/lib/paperclip.rb:118:in
included' from /home/mohnish/UP/dev/vendor/plugins/paperclip/lib/paperclip.rb:364:ininclude’
from
/home/mohnish/UP/dev/vendor/plugins/paperclip/lib/paperclip.rb:364:in
send' from /home/mohnish/UP/dev/vendor/plugins/paperclip/lib/paperclip.rb:364 from /home/mohnish/.rvm/rubies/ruby-1.8.7-p334/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:ingem_original_require’
from
/home/mohnish/.rvm/rubies/ruby-1.8.7-p334/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in
require' from /home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:496:inrequire’
from
/home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:342:in
new_constants_in' from /home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:496:inrequire’
from /home/mohnish/UP/dev/vendor/plugins/paperclip/init.rb:1:in
evaluate_init_rb' from /home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/rails-2.0.2/lib/rails/plugin.rb:79:inevaluate_init_rb’
from
/home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/activesupport-2.0.2/lib/active_support/core_ext/kernel/reporting.rb:11:in
silence_warnings' from /home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/rails-2.0.2/lib/rails/plugin.rb:75:inevaluate_init_rb’
from
/home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/rails-2.0.2/lib/rails/plugin.rb:39:in
load' from /home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/rails-2.0.2/lib/rails/plugin/loader.rb:33:inload_plugins’
from
/home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/rails-2.0.2/lib/rails/plugin/loader.rb:32:in
each' from /home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/rails-2.0.2/lib/rails/plugin/loader.rb:32:inload_plugins’
from
/home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/rails-2.0.2/lib/initializer.rb:189:in
load_plugins' from /home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/rails-2.0.2/lib/initializer.rb:105:inprocess’
from
/home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/rails-2.0.2/lib/initializer.rb:49:in
send' from /home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/rails-2.0.2/lib/initializer.rb:49:inrun’
from /home/mohnish/UP/dev/config/environment.rb:16
from
/home/mohnish/.rvm/rubies/ruby-1.8.7-p334/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in
gem_original_require' from /home/mohnish/.rvm/rubies/ruby-1.8.7-p334/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:inrequire’
from
/home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:496:in
require' from /home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:342:innew_constants_in’
from
/home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:496:in
require' from /home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/mongrel-1.1.5/bin/../lib/mongrel/rails.rb:147:inrails’
from
/home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/mongrel-1.1.5/bin/mongrel_rails:113:in
cloaker_' from /home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/mongrel-1.1.5/lib/mongrel/configurator.rb:149:incall’
from
/home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/mongrel-1.1.5/lib/mongrel/configurator.rb:149:in
listener' from /home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/mongrel-1.1.5/bin/mongrel_rails:99:incloaker_’
from
/home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/mongrel-1.1.5/lib/mongrel/configurator.rb:50:in
call' from /home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/mongrel-1.1.5/lib/mongrel/configurator.rb:50:ininitialize’
from
/home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/mongrel-1.1.5/bin/mongrel_rails:84:in
new' from /home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/mongrel-1.1.5/bin/mongrel_rails:84:inrun’
from
/home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/mongrel-1.1.5/lib/mongrel/command.rb:212:in
run' from /home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/mongrel-1.1.5/bin/mongrel_rails:281 from /home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:489:inload’
from
/home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:489:in
load' from /home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:342:innew_constants_in’
from
/home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:489:in
load' from /home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/rails-2.0.2/lib/commands/servers/mongrel.rb:64 from /home/mohnish/.rvm/rubies/ruby-1.8.7-p334/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:ingem_original_require’
from
/home/mohnish/.rvm/rubies/ruby-1.8.7-p334/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in
require' from /home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:496:inrequire’
from
/home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:342:in
new_constants_in' from /home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:496:inrequire’
from
/home/mohnish/.rvm/gems/ruby-1.8.7-p334/gems/rails-2.0.2/lib/commands/server.rb:39
from
/home/mohnish/.rvm/rubies/ruby-1.8.7-p334/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in
gem_original_require' from /home/mohnish/.rvm/rubies/ruby-1.8.7-p334/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:inrequire’
from script/server:3
[email protected]:~/UP/dev$

I really wonder where I am going wrong…

Any suggestions/insights would be highly appreciated. This is urgent for
me as I have a deployment due, I would be really glad to get prompt
answers/responses…

Thanks a lot…

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