Rails - Dec 2006 - Functional test a "create" action when a validation fails

I''m trying to write a functional test of a "create" action in
one of my
controllers.  In the corresponding model I have a
"validates_uniqueness_of :location".  In the test case I am
constructing I have the create fail with the error "Location has
already been taken".  Is there a way I can write an assertion like:
assert_equal "Location has already been taken", [the_actual_error].  I
can''t figure out how to retrieve the validation errors.  Thanks.


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kendall wrote:
> 
> I''m trying to write a functional test of a "create"
action in one of my
> controllers.  In the corresponding model I have a
> "validates_uniqueness_of :location".  In the test case I am
> constructing I have the create fail with the error "Location has
> already been taken".  Is there a way I can write an assertion like:
> assert_equal "Location has already been taken",
[the_actual_error].  I
> can''t figure out how to retrieve the validation errors.  Thanks.
assert_equal "has already been taken", 
assigns(:your_model_instance).errors(:location)

If my memory fails me and the above doesn''t work, check the API 
reference for ActiveRecord::Errors for the proper methods.

-- 
Jakob Skjerning - http://mentalized.net

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Thank you.  I''ll try that and report back.


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Thanks, Jakob, that was good advice.  I looked at the
ActiveRecord::Errors API and saw that it provides a ".on" method that
returns the error message text when provided with the attribute, which
in this case I assume would be "location_id".

Here is some code that works:

assert_equal ''has already been taken'',
       assigns(:my_model_instance).errors.on(''location_id'')

This next one also works.  Not sure which is better, but I think I''ll
keep the latter one for now.

assert_equal ActiveRecord::Errors.default_error_messages[:taken],
     assigns(:my_model_instance).errors.on(''location_id'')


Appreciate your help,
Kendall


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