Many to many :through problem

Hi all,

This should be a simple one, but I just don’t see my mistake.

Migration1:
class CreateCompanyUsers < ActiveRecord::Migration
def self.up
create_table :employments, :id => false do |t|
t.boolean :admin_role
t.integer :company_id, :user_id
t.timestamps
end
end

def self.down
drop_table :employments
end
end

Migration2:
class CreateCompanies < ActiveRecord::Migration
def self.up
create_table :companies do |t|
t.string :name, :subdomain
t.boolean :admin_company
t.timestamps
end
add_index :companies, :subdomain, :unique => true
Company.create :name => “Default”, :subdomain =>
“default”, :admin_company => true
end

def self.down
drop_table :companies
end
end

Migration3:
class CreateUsers < ActiveRecord::Migration
def self.up
create_table “users”, :force => true do |t|
t.column :login, :string, :limit => 40
t.column :name, :string, :limit =>
100, :default => ‘’, :null => true
t.column :email, :string, :limit => 100
t.column :crypted_password, :string, :limit => 40
t.column :salt, :string, :limit => 40
t.column :created_at, :datetime
t.column :updated_at, :datetime
t.column :remember_token, :string, :limit => 40
t.column :remember_token_expires_at, :datetime

end
add_index :users, :login, :unique => true
User.create :login => "admin", :name => "Administrator

God", :email => ‘[email protected]’, :password =>
‘password’, :password_confirmation => ‘password’
end

def self.down
drop_table “users”
end
end

And my models:
class Employment < ActiveRecord::Base
belongs_to :company
belongs_to :user
end

class Company < ActiveRecord::Base
has_many :employments
has_many :users, :through => :employments
end

class User < ActiveRecord::Base

cut out restful_auth stuff

has_many :employments
has_many :companies, :through => :employments

When testing in script/console:
Loading development environment (Rails 2.1.0)

user=User.find :first
=> #<User id: 1, login: “admin”, name: “Administrator God”, email:
[email protected]”, crypted_password:
“a5d460ff8566a5e0e11b6e591f1d8921a5726ea6”, salt:
“872d3a4ebb1d9b2ef6be18938d36aea3bafe2646”, created_at: “2008-08-24
15:53:40”, updated_at: “2008-08-24 15:53:40”, remember_token: nil,
remember_token_expires_at: nil>

company=Company.find :first
=> #<Company id: 1, name: “Default”, subdomain: “default”,
admin_company: true, created_at: “2008-08-24 15:53:40”, updated_at:
“2008-08-24 15:53:40”>

company.users << user
NameError: uninitialized constant Company::Employment
from /Library/Ruby/Gems/1.8/gems/activesupport-2.1.0/lib/
active_support/dependencies.rb:492:in const_missing' from /Library/Ruby/Gems/1.8/gems/activerecord-2.1.0/lib/active_record/ base.rb:1909:incompute_type’
from /Library/Ruby/Gems/1.8/gems/activerecord-2.1.0/lib/active_record/
reflection.rb:129:in send' from /Library/Ruby/Gems/1.8/gems/activerecord-2.1.0/lib/active_record/ reflection.rb:129:inklass’
from /Library/Ruby/Gems/1.8/gems/activerecord-2.1.0/lib/active_record/
reflection.rb:189:in source_reflection' from /Library/Ruby/Gems/1.8/gems/activerecord-2.1.0/lib/active_record/ reflection.rb:189:incollect’
from /Library/Ruby/Gems/1.8/gems/activerecord-2.1.0/lib/active_record/
reflection.rb:189:in source_reflection' from /Library/Ruby/Gems/1.8/gems/activerecord-2.1.0/lib/active_record/ reflection.rb:198:incheck_validity!’
from /Library/Ruby/Gems/1.8/gems/activerecord-2.1.0/lib/active_record/
associations/has_many_through_association.rb:5:in initialize' from /Library/Ruby/Gems/1.8/gems/activerecord-2.1.0/lib/active_record/ associations.rb:1128:innew’
from /Library/Ruby/Gems/1.8/gems/activerecord-2.1.0/lib/active_record/
associations.rb:1128:in `users’
from (irb):3

So what did I do wrong, or what did I miss?

Kind regards,
Wijnand

On 24 Aug 2008, at 17:12, Wijnand W. wrote:

 t.integer    :company_id, :user_id
 t.timestamps

end
end

With has many through, the join table is a model in its own right so
you must not skip :id like you are doing here.

When testing in script/console:
admin_company: true, created_at: “2008-08-24 15:53:40”, updated_at:
“2008-08-24 15:53:40”>

company.users << user
NameError: uninitialized constant Company::Employment

That’s odd, it couldn’t find your Employment class. Is it in
employment.rb ?

Fred

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