I''ve searched for information about this and compared what I have to the solutions I can find, here and elsewhere. I found some good and useful information, yet my stuff still doesn''t work. I was hoping somebody here could spot something. I''m using rails 2.1.2 and I''m pretty new to ruby and rails. My goal is a fairly simple many-to-many relationship linking "modules" and "users". There''s 3 tables (I know the names are inconsistent - it''s a little strange because it was an existing database that I dumped into rails): - module: a module definition - users: the users of the system - module_user_map: join table linking modules and users My data model (from schema.rb) looks in part like this: create_table "module", :force => true do |t| t.string "name", :default => "", :null => false t.integer "status", :default => 0, :null => false ... end create_table "module_user_map", :force => true do |t| t.integer "module", :default => 0, :null => false t.integer "user", :default => 0, :null => false ... end create_table "users", :force => true do |t| t.string "first_name", :limit => 45 t.string "last_name", :limit => 45 t.string "login", :limit => 45 ... end Here''s the corresponding files in app/models directory. It appears that I could not use "module" as the model name because that is a reserved word in rails, so I had to prepend "project_" to the "module" names. This might be where I messed up, I don''t know. =============== project_module.rb ==================class ProjectModule < ActiveRecord::Base set_table_name "module" has_many :module_user_maps, :dependent => :delete_all has_many :users, :through => :module_user_maps end =============== user.rb ==================class User < ActiveRecord::Base has_many :module_user_maps, :dependent => :delete_all has_many :project_modules, :through => :module_user_maps end =============== module_user_maps.rb ==================class ModuleUserMaps < ActiveRecord::Base set_table_name "module_user_map" belongs_to :user belongs_to :project_module end So I run from the script/console (same thing happens in the server):>> u=User.find(2)=> #<User id: 2, first_name: "Site", last_name: "User", login: "user", password: "password", organization: 2, roles: "public", last_modified: "2008-11-17 12:09: 10", last_modified_by: nil, last_login: "2008-11-17 12:10:06", status: 1, date_c reated: nil, address1: nil, address2: nil, city: nil, state: nil, postal_code: n il, email: nil>>> u.project_modulesNameError: uninitialized constant User::ModuleUserMap from C:/Ruby/lib/ruby/gems/1.8/gems/activesupport-2.1.2/lib/active_suppo rt/dependencies.rb:493:in `const_missing'' ... etc ...>> u.module_user_mapsNameError: uninitialized constant User::ModuleUserMap from C:/Ruby/lib/ruby/gems/1.8/gems/activesupport-2.1.2/lib/active_suppo rt/dependencies.rb:493:in `const_missing'' from C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.1.2/lib/active_record /base.rb:1914:in `compute_type'' ... etc ... I''m hoping somebody can spot something fairly simple. This should not be a hard thing to do. Thanks! -- Posted via http://www.ruby-forum.com/. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
Bill Walton
2008-Nov-29 04:09 UTC
Re: Yet another "NameError: uninitialized constant" problem
Hi Gary, Gary Bisaga wrote:> =============== module_user_maps.rb ==================> class ModuleUserMaps < ActiveRecord::Base > set_table_name "module_user_map" > belongs_to :user > belongs_to :project_module > end > > So I run from the script/console (same thing happens in the server): > > NameError: uninitialized constant User::ModuleUserMapI think if you change the class name to singular (and the file name) you''ll be good to go. Best regards, Bill --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
Gary Bisaga
2008-Nov-29 04:26 UTC
Re: Yet another "NameError: uninitialized constant" problem
Hallelujah! You are a lifesaver Bill - you got me almost all the way home. At least, now it is giving me an error message that is actually useful in figuring out what the problem is: ActiveRecord::StatementInvalid: Mysql::Error: #42S22Unknown column ''module_user_ map.user_id'' in ''where clause'': SELECT `module`.* FROM `module` INNER JOIN mo dule_user_map ON module.id = module_user_map.project_module_id WHERE ((`modul e_user_map`.user_id = 2)) So, after adding a few :foreign_key declarations like this: class ModuleUserMap < ActiveRecord::Base set_table_name "module_user_map" belongs_to :user, :foreign_key => "user" belongs_to :project_module, :foreign_key => "module" end we''re good. Thank you so much! It would be great if this gave better error messages. <>< gary Bill Walton wrote:> I think if you change the class name to singular (and the file name) > you''ll be good to go.-- Posted via http://www.ruby-forum.com/. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
Bill Walton
2008-Nov-29 04:36 UTC
Re: Yet another "NameError: uninitialized constant" problem
Hi Gary, Gary Bisaga wrote:> we''re good. Thank you so much!You''re very welcome. Glad to help. Best regards, Bill --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---