Hello,
I'm doing right now my first steps in Ruby on Rails and I've got a
problem.
Just some explanation:
A project can have ressources (like an employee) and this ressource can
have certain roles (e.g. a team member, or a team leader).
As you can see in the attachment, I have a Table called
Projects_Ressources. This Table has three relationships (belongs_to).
One to Projects, one to Ressources and one to Roles.
This is my model description for,
role.rb:
<code>
class Role < ActiveRecord::Base
has_many :projects_ressources
has_many :ressources, :through => :projects_ressources
has_many :permissions_roles
has_many :permissions, :through => :permissions_roles
end
</code>
project.rb:
<code>
class Project < ActiveRecord::Base
has_many :projects_ressources
has_many :ressources, :through => :projects_ressources
end
</>
ressource.rb:
<code>
class Ressource < ActiveRecord::Base
has_many :projects_ressources
has_many :projects, :through => :projects_ressources
has_many :roles, :through => :projects_ressources
end
</code>
projects_ressources.rb:
<code>
class ProjectsRessource < ActiveRecord::Base
belongs_to :ressource
belongs_to :project
belongs_to :role
end
</code>
When I'm now in the console, I can get for example the project with id 1
>> pro = Project.find(1)
And can get all the ressources to this certain project:
>> employee = pro.ressources
But I want also to know the roles of this ressources. How can I get now
the roles of the ressources to this project with id 1? This doesn't
work:
>> role = pro.roles
produces this error in the console:
<code>
NoMethodError: undefined method `roles' for #<Project:0x4dffdc0>
from
c:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record
/attribute_methods.rb:260:in `method_missing'
from (irb):47
from :0
</code>
Is the design of the relationship wrong or what am I missing?
Attachments:
http://www.ruby-forum.com/attachment/4360/erm.PNG
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