Ruby on Rails

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
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 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.

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