From: gpasley@...
Date: 2006-09-24T15:10:06+09:00
Subject: NoMethodError

I am trying to validate the uniqueness of a field:

class Department < ActiveRecord::Base
  belongs_to :company
  belongs_to :region
  has_many :employees
  validates_presence_of :dept_name
end


When I run it, I get this error message:

 NoMethodError in Department#create

Showing app/views/department/_form.rhtml where line #34 raised:

You have a nil object when you didn't expect it!
You might have expected an instance of Array.
The error occured while evaluating nil.each

Extracted source (around line #34):

31:        <% if @page_title == "New Department"  %>
32:        <select name="department[company_id]">
33:           <option value="0">Select One</option>
34:          <% @companies.each do |company| %>
35:            <option value="<%= company.id %>">
36:              <%= company.comp_name %>
37:            </option>

However, if I take validates_uniqueness_of off, i.e.:

class Department < ActiveRecord::Base
  belongs_to :company
  belongs_to :region
  has_many :employees
  #validates_uniqueness_of :dept_name
end

everything works just fine. What am I doing wrong?

George