Rspec model class methods

I’ve started specifying a project and could use some help. I’m not sure
if the spec is entirely necessary, it would be great to get some
guidance on a best practice or something close.

I recently realized the need to add the method below grouped_by_months
and started to write a spec.

idea 1:
{{{
before do
@comment = Comment.new
@comment.stub!(:created_at).and_return(Time.now -2.days)
end

it ‘should return comments grouped by month’ do
group_terms = lambda{|comment| comment.created_at.beginning_of_month
}

Comment.should_receive(:find).and_return([@comment])
[@comment].should_receive(:group_by).with(&group_terms).and_return([[@comment]])

Comment.grouped_by_month

end
}}}

idea 2
{{{

before do
@comment = Comment.new
@comment.stub!(:created_at).and_return(Time.now -2.days)
end

it ‘should return comments grouped by month’ do
group_terms = lambda{|comment| comment.created_at.beginning_of_month }
lambda{
Comment.should_receive(:find).and_return([@comment])
}.should_receive(:group_by).with(&group_terms)

Comment.grouped_by_month
end
}}}

Class with method
{{{
class Comment < ActiveRecord::Base

validates_presence_of :email, :body
validates_format_of :email, :with =>
/\A([^@\s]+)@((?:[-a-z0-9]+.)+[a-z]{2,})\Z/i, :message => ‘invalid
email address’

def self.grouped_by_month
find(:all).group_by{|comment| comment.created_at.beginning_of_month
}
end

end
}}}

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