rspec users - Jul 2010 - [newbie] rspec, validations and factory_girl

Hi,

class B < ActiveRecord::Base
  belongs_to :a
  validates_numericality_of :some_attribute, :greater_than =>
0, :allow_blank=>true

  def some_attribute
      a.numeric_attr * read_attribute(:some_attribute)
  end
  ...

If I create an instance of my class B in rspec with factory_girl w.out
a parent (but not required!) instance of class A, I get the following
error: "undefined method `numeric_attr'' for nil:NilClass".

Why? Is this an apparent idiosyncrasy of using rspec and factory_girl
together?

Thanks,

Lille

On Jul 26, 2010, at 11:34 AM, Lille wrote:
> Hi,
> 
> class B < ActiveRecord::Base
>  belongs_to :a
>  validates_numericality_of :some_attribute, :greater_than =>
> 0, :allow_blank=>true
> 
>  def some_attribute
>      a.numeric_attr * read_attribute(:some_attribute)
>  end
>  ...
> 
> If I create an instance of my class B in rspec with factory_girl w.out
> a parent (but not required!)
It may not be a business requirement, but the some_attribute method above
requires it''s existence in order to run without error.

Try:

def some_attribute
  return nil unless a
  a.numeric_attr * read_attribute(:some_attribute)
end

HTH,
David
> instance of class A, I get the following
> error: "undefined method `numeric_attr'' for
nil:NilClass".
> 
> Why? Is this an apparent idiosyncrasy of using rspec and factory_girl
> together?
> Thanks,
> 
> Lille

OK.

On a Rails note, this seems to suggest that attributes are checked
from their accessors before the save, whereas I had assumed my
some_attribute accessor would not be called at all during
validation...

(Thank you David, this is one of the better groups I''ve lately
monitored, and a fine complement to your book...)

Thanks,

Lille

On Jul 26, 1:06?pm, David Chelimsky <dchelim... at gmail.com>
wrote:
> On Jul 26, 2010, at 11:34 AM, Lille wrote:
>
> > Hi,
>
> > class B < ActiveRecord::Base
> > ?belongs_to :a
> > ?validates_numericality_of :some_attribute, :greater_than =>
> > 0, :allow_blank=>true
>
> > ?def some_attribute
> > ? ? ?a.numeric_attr * read_attribute(:some_attribute)
> > ?end
> > ?...
>
> > If I create an instance of my class B in rspec with factory_girl w.out
> > a parent (but not required!)
>
> It may not be a business requirement, but the some_attribute method above
requires it''s existence in order to run without error.
>
> Try:
>
> def some_attribute
> ? return nil unless a
> ? a.numeric_attr * read_attribute(:some_attribute)
> end
>
> HTH,
> David
>
> > instance of class A, I get the following
> > error: "undefined method `numeric_attr'' for
nil:NilClass".
>
> > Why? Is this an apparent idiosyncrasy of using rspec and factory_girl
> > together?
> > Thanks,
>
> > Lille
>
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