Has many through button

Rails
1

I’m working on three files to get a button working:

http://strawr.googlecode.com/svn/trunk/app/controllers/
categories_controller.rb

http://strawr.googlecode.com/svn/trunk/app/helpers/application_helper.rb

http://strawr.googlecode.com/svn/trunk/app/views/feeds/show.rhtml

so that when navigating to http://localhost:3000/feeds/show/2 there’s a
drop down list of all Category objects (this works). I want to be able
to click on the “record” button so that it captures the feed_id, in this
case “2”, and also the category_id from the drop-down list.

Currently clicking on this button as described will generate:

ActiveRecord::RecordNotFound in FeedsController#record

Couldn’t find Feed without an ID

RAILS_ROOT: ./script/…/config/…
Application Trace | Framework Trace | Full Trace

/usr/lib/ruby/gems/1.8/gems/activerecord-1.15.5/lib/active_record/
base.rb:1012:in find_from_ids' /usr/lib/ruby/gems/1.8/gems/activerecord-1.15.5/lib/active_record/ base.rb:419:in find’
/home/thufir/Desktop/strawr/app/controllers/feeds_controller.rb:54:in
`record’

/usr/lib/ruby/gems/1.8/gems/activerecord-1.15.5/lib/active_record/
base.rb:1012:in find_from_ids' /usr/lib/ruby/gems/1.8/gems/activerecord-1.15.5/lib/active_record/ base.rb:419:in find’
/usr/lib/ruby/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/
base.rb:1101:in send' /usr/lib/ruby/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/ base.rb:1101:in perform_action_without_filters’
/usr/lib/ruby/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/
filters.rb:696:in call_filters' /usr/lib/ruby/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/ filters.rb:688:in perform_action_without_benchmark’
/usr/lib/ruby/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/
benchmarking.rb:66:in perform_action_without_rescue' /usr/lib/ruby/1.8/benchmark.rb:293:in measure’
/usr/lib/ruby/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/
benchmarking.rb:66:in perform_action_without_rescue' /usr/lib/ruby/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/ rescue.rb:83:in perform_action’
/usr/lib/ruby/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/
base.rb:435:in send' /usr/lib/ruby/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/ base.rb:435:in process_without_filters’
/usr/lib/ruby/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/
filters.rb:684:in process_without_session_management_support' /usr/lib/ruby/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/ session_management.rb:114:in process’
/usr/lib/ruby/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/
base.rb:334:in process' /usr/lib/ruby/gems/1.8/gems/rails-1.2.5/lib/dispatcher.rb:41:in dispatch’
/usr/lib/ruby/gems/1.8/gems/rails-1.2.5/lib/webrick_server.rb:113:in
handle_dispatch' /usr/lib/ruby/gems/1.8/gems/rails-1.2.5/lib/webrick_server.rb:79:in service’
/usr/lib/ruby/1.8/webrick/httpserver.rb:104:in service' /usr/lib/ruby/1.8/webrick/httpserver.rb:65:in run’
/usr/lib/ruby/1.8/webrick/server.rb:173:in start_thread' /usr/lib/ruby/1.8/webrick/server.rb:162:in start’
/usr/lib/ruby/1.8/webrick/server.rb:162:in start_thread' /usr/lib/ruby/1.8/webrick/server.rb:95:in start’
/usr/lib/ruby/1.8/webrick/server.rb:92:in each' /usr/lib/ruby/1.8/webrick/server.rb:92:in start’
/usr/lib/ruby/1.8/webrick/server.rb:23:in start' /usr/lib/ruby/1.8/webrick/server.rb:82:in start’
/usr/lib/ruby/gems/1.8/gems/rails-1.2.5/lib/webrick_server.rb:63:in
dispatch' /usr/lib/ruby/gems/1.8/gems/rails-1.2.5/lib/commands/servers/webrick.rb:59 /usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in gem_original_require’
/usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in require' /usr/lib/ruby/gems/1.8/gems/activesupport-1.4.4/lib/active_support/ dependencies.rb:495:in require’
/usr/lib/ruby/gems/1.8/gems/activesupport-1.4.4/lib/active_support/
dependencies.rb:342:in new_constants_in' /usr/lib/ruby/gems/1.8/gems/activesupport-1.4.4/lib/active_support/ dependencies.rb:495:in require’
/usr/lib/ruby/gems/1.8/gems/rails-1.2.5/lib/commands/server.rb:39
/usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in
gem_original_require' /usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in require’
script/server:3

/usr/lib/ruby/gems/1.8/gems/activerecord-1.15.5/lib/active_record/
base.rb:1012:in find_from_ids' /usr/lib/ruby/gems/1.8/gems/activerecord-1.15.5/lib/active_record/ base.rb:419:in find’
/home/thufir/Desktop/strawr/app/controllers/feeds_controller.rb:54:in
record' /usr/lib/ruby/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/ base.rb:1101:in send’
/usr/lib/ruby/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/
base.rb:1101:in perform_action_without_filters' /usr/lib/ruby/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/ filters.rb:696:in call_filters’
/usr/lib/ruby/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/
filters.rb:688:in perform_action_without_benchmark' /usr/lib/ruby/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/ benchmarking.rb:66:in perform_action_without_rescue’
/usr/lib/ruby/1.8/benchmark.rb:293:in measure' /usr/lib/ruby/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/ benchmarking.rb:66:in perform_action_without_rescue’
/usr/lib/ruby/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/
rescue.rb:83:in perform_action' /usr/lib/ruby/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/ base.rb:435:in send’
/usr/lib/ruby/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/
base.rb:435:in process_without_filters' /usr/lib/ruby/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/ filters.rb:684:in process_without_session_management_support’
/usr/lib/ruby/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/
session_management.rb:114:in process' /usr/lib/ruby/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/ base.rb:334:in process’
/usr/lib/ruby/gems/1.8/gems/rails-1.2.5/lib/dispatcher.rb:41:in
dispatch' /usr/lib/ruby/gems/1.8/gems/rails-1.2.5/lib/webrick_server.rb:113:in handle_dispatch’
/usr/lib/ruby/gems/1.8/gems/rails-1.2.5/lib/webrick_server.rb:79:in
service' /usr/lib/ruby/1.8/webrick/httpserver.rb:104:in service’
/usr/lib/ruby/1.8/webrick/httpserver.rb:65:in run' /usr/lib/ruby/1.8/webrick/server.rb:173:in start_thread’
/usr/lib/ruby/1.8/webrick/server.rb:162:in start' /usr/lib/ruby/1.8/webrick/server.rb:162:in start_thread’
/usr/lib/ruby/1.8/webrick/server.rb:95:in start' /usr/lib/ruby/1.8/webrick/server.rb:92:in each’
/usr/lib/ruby/1.8/webrick/server.rb:92:in start' /usr/lib/ruby/1.8/webrick/server.rb:23:in start’
/usr/lib/ruby/1.8/webrick/server.rb:82:in start' /usr/lib/ruby/gems/1.8/gems/rails-1.2.5/lib/webrick_server.rb:63:in dispatch’
/usr/lib/ruby/gems/1.8/gems/rails-1.2.5/lib/commands/servers/webrick.rb:59
/usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in
gem_original_require' /usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in require’
/usr/lib/ruby/gems/1.8/gems/activesupport-1.4.4/lib/active_support/
dependencies.rb:495:in require' /usr/lib/ruby/gems/1.8/gems/activesupport-1.4.4/lib/active_support/ dependencies.rb:342:in new_constants_in’
/usr/lib/ruby/gems/1.8/gems/activesupport-1.4.4/lib/active_support/
dependencies.rb:495:in require' /usr/lib/ruby/gems/1.8/gems/rails-1.2.5/lib/commands/server.rb:39 /usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in gem_original_require’
/usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `require’
script/server:3

Request

Parameters: None

Show session dump

flash: !map:ActionController::Flash::FlashHash {}

Response
Headers: {“cookie”=>[], “Cache-Control”=>“no-cache”}

The relationship between the tables:

thufir@arrakis ~/Desktop/strawr $
thufir@arrakis ~/Desktop/strawr $ cat app/models/category.rb
class Category < ActiveRecord::Base
has_many :tags
has_many :feeds, :through => :tags
end
thufir@arrakis ~/Desktop/strawr $
thufir@arrakis ~/Desktop/strawr $ cat app/models/feed.rb
class Feed < ActiveRecord::Base
has_many :tags
has_many :categories, :through => :tags
end
thufir@arrakis ~/Desktop/strawr $
thufir@arrakis ~/Desktop/strawr $ cat app/models/tag.rb
class Tag < ActiveRecord::Base
belongs_to :category
belongs_to :feed

end
thufir@arrakis ~/Desktop/strawr $

thanks,

Thufir

2

On Mon, 31 Dec 2007 06:07:08 +0000, Thufir wrote:

so that when navigating to http://localhost:3000/feeds/show/2 there’s a
drop down list of all Category objects (this works).

Please ignore my previous post, I’ve gone in a totally different
direction.

While the follow tutorial is certainly dated, it’s precisely what I want
to do:

“2. View
To allow our web visitors to relate an expense with many tags, we are
going to use multiple checkboxes. This is how it will look.”
http://jrhicks.net/96

For my project, it’s relating a feed with many tags; otherwise I’m
aiming
for exactly what’s described in the PDF of the above link.

So, I used svn to roll back a bit and start over. Here’s where I’m at:

NoMethodError in Feeds#edit

Showing app/views/feeds/_form.rhtml where line #9 raised:

You have a nil object when you didn’t expect it!
You might have expected an instance of Array.
The error occurred while evaluating nil.each

Extracted source (around line #9):

http://strawr.googlecode.com/svn/trunk/app/views/feeds/_form.rhtml

Prior to editing _form.rhmtl the basic CRUD actions for the db were
vanilla, but worked.

thanks,

Thufir