On 28 November 2010 21:07, Bruno Amaral <m...@brunoamaral.eu> wrote: > I am trying to build a small database of Universities, Departments and > Courses. But for some reason I can't seem to get a list of courses > attached to a Department. > > So far I have the following Database: > => Course(id: integer, course_name: string, length: integer, > description: text, programme: string, department_id: integer, > university_id: integer, created_at: datetime, updated_at: datetime) > > => Department(id: integer, department_name: string, > department_description: text, head_firstname: string, head_lastname: > string, head_email: string, university_id: integer, courses_id: > integer, created_at: datetime, updated_at: datetime) > > => University(id: integer, name: string, website: string, country: > string, city: string, departments_id: integer, courses_id: integer, > created_at: datetime, updated_at: datetime) > > Models: > class Course < ActiveRecord::Base > belongs_to :department > belongs_to :university
You don't need course belongs_to university, because course belongs_to department and department belongs_to university. So the university for a course is course.department.university. That is on the assumption that the university the course belongs to is the same one that it's department belongs to. > end > class Department < ActiveRecord::Base > belongs_to :university > has_many :courses > end > class University < ActiveRecord::Base > has_many :departments > has_many :courses > end > > For the Department I am trying to run the following controller > def index > �...@departments = Department.includes(:courses, :university) > > and the following view: > <% @departments.each do |department| %> > <tr> > <td><%= department.department_name %></td> > <td><%= department.department_description %></td> > <td><%= department.head_firstname %></td> > <td><%= department.head_lastname %></td> > <td><%= department.head_email %></td> > <td><%= department.university.name %></td> > <td><%= department.courses %> > > that last line outputs #<Course:0x1042b8270> and it fails when i try > to add something like department.courses.course_name I see Fred has pointed out the problem here already. Colin > > I am at a loss here and haven't been able to find any clues on the > documentation as to what I might be doing wrong. If anyone could at > least point me in the right direction, that would be great. > > -- > 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-t...@googlegroups.com. > To unsubscribe from this group, send email to > rubyonrails-talk+unsubscr...@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/rubyonrails-talk?hl=en. > > -- 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-t...@googlegroups.com. To unsubscribe from this group, send email to rubyonrails-talk+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.
