I'm new and I just trying to figure out something about associations.
The following ruby code works but does not work in my actual rails
application. Am I doing something wrong or is there a reason why I
need to always use an extra table for a has_many_and_belongs_to
relationship? When I try this is Rails its willing to do a part of
this
(e.g, e.department) but not the last '.customers' part? I could of
course just to x = e.department and then do x.customers (which does
work in Rails) but why do I need to do this in two steps instead of
one? I can see that for large datasets why the additional table would
help but if the dataset is small why do you need the extra table/
steps?
require 'rubygems';require 'active_record'; require 'mysql';
ActiveRecord::Base.establish_connection(:adapter =>
'mysql', :database => "idea", :username => "myname", :password =>
'mypswd')
class Employee < ActiveRecord::Base
belongs_to :department
end
class Department < ActiveRecord::Base
has_many :departments
has_many :comments
end
class Customers < ActiveRecord::Base
belongs_to :department
end
e = Employee.find(1)
#to find the number of customers associated with a particular employee
within a department
p e.department.customers.size
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