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:
33: Select One
34: <% @companies.each do |company| %>
35:
36: <%= company.comp_name %>
37:

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

On Sun, Sep 24, 2006 at 03:10:06PM +0900, [email protected] wrote:

I am trying to validate the uniqueness of a field:
[ snip ]

Well first, you are posting to the wrong mailing list ;). You want the
Rails mailing list for this question. Second, I’m guessing that the
table column isn’t actually dept_name (maybe a typo, dep_name, maybe you
actually spelled it out department_name, who knows). But that’s just a
guess. I would suggest asking your question again on the rails list.

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