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. #134 Paperclip - RailsCasts
2. http://jimneath.org/2008/04/17/paperclip-attaching-files-in-rails.html
I did a git clone on the paperclip plugin via:- GitHub - thoughtbot/paperclip: Easy file attachment management for ActiveRecord , 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>
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:in `method_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:in `method_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:in `load_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:in `load_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:in `load_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:in `const_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:in `send' /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:in `show' /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:in `perform_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:in `perform_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:in `measure' /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:in `perform_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:in `cache' /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:in `perform_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:in `process_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:in `process_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:in `process' /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:in `dispatch' /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:in `dispatch' /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:in `synchronize' /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:in `process_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:in `process_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:in `initialize' /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:in `run' /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:in `new' /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:in `run' /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:in `run' /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:in `run' /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:in `load' /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:in `load' /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:in `require' /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:in `new_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:in `gem_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| -%> <p><label>Start Discussion:</label><br><%=f.text_field :message%></p> <%=f.file_field :photo%></p> <p><%=submit_tag "Post"%></p> <%end%>
I tried what was given in:-
