Rails - Jan 2006 - Testing ActiveRecord associations

How do I write a test which proves something like "Post :has_many 
Comments" and "Comment :belongs_to Post"? It doesn''t
seem to be covered
in "A Guide to Testing the Rails" on manuals.rubyonrails.com.

Cheers, Robert.

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On Sat, Jan 21, 2006 at 06:49:19AM +0100, Robert Atkins
wrote:
> How do I write a test which proves something like "Post :has_many 
> Comments" and "Comment :belongs_to Post"? It
doesn''t seem to be covered
> in "A Guide to Testing the Rails" on manuals.rubyonrails.com.
Add a couple of post records and a bunch of comments records in your
fixtures, then p = Post.find(<id>) and assert_equal things like <n>,
p.comments.count and "Fred Q. Bloggs", p.comments[0].author.

- Matt

-- 
A polar bear is a rectangular bear after a coordinate transform.

On Jan 20, 2006, at 9:49 PM, Robert Atkins wrote:
> How do I write a test which proves something like "Post :has_many
> Comments" and "Comment :belongs_to Post"? It
doesn''t seem to be
> covered
> in "A Guide to Testing the Rails" on manuals.rubyonrails.com.
If you have:

class Point < CachedModel

   belongs_to :route

   has_many :photos, :order => ''date_taken''

   # ...

end

You should test that a Point has a valid Route and that the Photos of  
a Point are in the correct order (your app will eventually depend on  
the order, so you need an explicit test).

class PointTest < Test::Unit::TestCase

   fixtures :users, :routes, :points, :photos

   # ...

   def test_photos
     assert_equal [photos(:gate), photos(:door)], points 
(:between).photos
   end

   def test_route
     assert_equal routes(:work), points(:home).route
   end

   # ...

end

-- 
Eric Hodel - drbrain@segment7.net - http://segment7.net
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