Join Relationship Model question

Rails
1

Hi! I’m modeling my application and i have a question about
relationships:

I have 3 classes (tables): User (users), Company (companies) and Rol
(rols)

The relationship between the 3 classes is another table that has:

Joining table X
user_id
company_id
rol_id

Because a the same user can be in many companies. A company can have
many users. An a user have a single rol in a company but different
rols in another company.

So i can’t name my table like users_companies because i have another
field, the rol_id so i should find another name, lets say X.

My model should be something like?:

class User < ActiveRecord::Base
has_many :X
has_many :companies, :through => X
end

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

class X < ActiveRecord::Base
belongs_to :company
belongs_to :users
has_one :rol
end

And rol isn’t a class because just have the type of user (“Admin”,
“Regular”).

Is this ok? Is my first time doing this kind of relationship :frowning:

Thanks in advance!

2

let me first clear something up:
is “rols” (yopu mean “roles”?) a real table? you wrote so. then why
shouldn’t it have a model-class? it should!

now about the association:
#tables:
users
companies
roles
jobs

class User < ActiveRecord::Base
has_many :jobs
has_many :companies, :through => :jobs
has_many :roles, through => :jobs
end

class Company < ActiveRecord::Base
has_many :jobs
has_many :users, :through => :jobs
has_many :companies, :though => :jobs
end
class Role < ActiveRecord::Base
has_many :jobs
has_many :users, :through => :jobs
has_many :companies, :through => :jobs
end

You can remove some of the associations when you don’t need them (e.g.
i dont see a use to find all companies that have a role “Admin”)

you can then do:
#controller
@user = User.find_by_id(1)
@jobs = @user.jobs.find :all, :include => :companies, :roles

#view
<% @jobs.each do |job| %>

Jobs of <%= @user.name %>

Company: <%= job.company.name %>
Role:<%= job.role.name %>

<% end %>

etc. pp.

3

On 6/1/07, Thorsten [email protected] wrote:

let me first clear something up:
is “rols” (yopu mean “roles”?) a real table? you wrote so. then why
shouldn’t it have a model-class? it should!

Yes, i realized that after sending the email.

has_many :companies, :through => :jobs
has_many :users, :through => :jobs
has_many :companies, :through => :jobs
end

I did something like that: classes: Role, User, Company and Profile (or
job).

Where Profile belongs_to user, company and role.
And User and Company have relationships like the one you wrote.

Jobs of <%= @user.name %>

Company: <%= job.company.name %>
Role:<%= job.role.name %>

<% end %>

etc. pp.

Thank you very much for your time and helping me understand this a bit
more.