rspec users - Jun 2007 - checking associated objects have been deleted

I have the following model:

class Book < ActiveRecord::Base
  has_many :taggings, :dependent => :delete_all
  has_many :tags, :through => :taggings
end

is it possible to check that associated taggings are being destroyed
using mocks? I don''t want to test that rails is deleting the
associations, I want to test that I have specified the association as
a dependent one.

the only way I can think of is to use fixtures (or create real
associations in the before callback) and then check that they have
been deleted using Taggings.count(). Can it be done using mocks
instead?

describe Book do

  before do
    @book = mock_model(Book)
    @tagging = mock_model(Tagging)
    @book.stub!(:taggings).and_return([@tagging, @tagging])
  end

  it "should delete associated taggings when destroyed" do
  end

end

thanks
dave

On 6/7/07, David Green <pocketsized at tiscali.co.uk>
wrote:
> I have the following model:
>
> class Book < ActiveRecord::Base
>   has_many :taggings, :dependent => :delete_all
>   has_many :tags, :through => :taggings
> end
>
> is it possible to check that associated taggings are being destroyed
> using mocks? I don''t want to test that rails is deleting the
> associations, I want to test that I have specified the association as
> a dependent one.
>
> the only way I can think of is to use fixtures (or create real
> associations in the before callback) and then check that they have
> been deleted using Taggings.count(). Can it be done using mocks
> instead?
>
> describe Book do
>
>   before do
>     @book = mock_model(Book)
>     @tagging = mock_model(Tagging)
>     @book.stub!(:taggings).and_return([@tagging, @tagging])
>   end
>
>   it "should delete associated taggings when destroyed" do
>   end
>
> end
You have to create a real book, but you can create a mock tagging:

book = Book.create(:title => "the book")
book.taggings << tagging = mock_model(Tagging, :[]= => true, :save
=> true)
tagging.should_receive(:destroy)
book.destroy

Cheers,
David


>
> thanks
> dave
> _______________________________________________
> rspec-users mailing list
> rspec-users at rubyforge.org
> http://rubyforge.org/mailman/listinfo/rspec-users
>

On 6/7/07, David Chelimsky <dchelimsky at gmail.com>
wrote:
> On 6/7/07, David Green <pocketsized at tiscali.co.uk> wrote:
> > I have the following model:
> >
> > class Book < ActiveRecord::Base
> >   has_many :taggings, :dependent => :delete_all
> >   has_many :tags, :through => :taggings
> > end
> >
> > is it possible to check that associated taggings are being destroyed
> > using mocks? I don''t want to test that rails is deleting the
> > associations, I want to test that I have specified the association as
> > a dependent one.
> >
> > the only way I can think of is to use fixtures (or create real
> > associations in the before callback) and then check that they have
> > been deleted using Taggings.count(). Can it be done using mocks
> > instead?
> >
> > describe Book do
> >
> >   before do
> >     @book = mock_model(Book)
> >     @tagging = mock_model(Tagging)
> >     @book.stub!(:taggings).and_return([@tagging, @tagging])
> >   end
> >
> >   it "should delete associated taggings when destroyed" do
> >   end
> >
> > end
>
> You have to create a real book, but you can create a mock tagging:
Actually, you don''t have to save it - you can use #new instead of
create:

book = Book.new(:title => "the book")
book.taggings << tagging = mock_model(Tagging, :[]= => true, :save
=> true)
tagging.should_receive(:destroy)
book.destroy
>
> Cheers,
> David
>
>
>
> >
> > thanks
> > dave
> > _______________________________________________
> > rspec-users mailing list
> > rspec-users at rubyforge.org
> > http://rubyforge.org/mailman/listinfo/rspec-users
> >
>

On 6/7/07, David Chelimsky <dchelimsky at gmail.com>
wrote:
> On 6/7/07, David Green <pocketsized at tiscali.co.uk> wrote:
> > I have the following model:
> >
> > class Book < ActiveRecord::Base
> >   has_many :taggings, :dependent => :delete_all
> >   has_many :tags, :through => :taggings
> > end
> >
> > is it possible to check that associated taggings are being destroyed
> > using mocks? I don''t want to test that rails is deleting the
> > associations, I want to test that I have specified the association as
> > a dependent one.
> >
> > the only way I can think of is to use fixtures (or create real
> > associations in the before callback) and then check that they have
> > been deleted using Taggings.count(). Can it be done using mocks
> > instead?
> >
> > describe Book do
> >
> >   before do
> >     @book = mock_model(Book)
> >     @tagging = mock_model(Tagging)
> >     @book.stub!(:taggings).and_return([@tagging, @tagging])
> >   end
> >
> >   it "should delete associated taggings when destroyed" do
> >   end
> >
> > end
>
> You have to create a real book, but you can create a mock tagging:
Actually, you don''t have to save it - you can use #new instead of
create:

book = Book.new(:title => "the book")
book.taggings << tagging = mock_model(Tagging, :[]= => true, :save
=> true)
tagging.should_receive(:destroy)
book.destroy
>
> Cheers,
> David
>
hi David

that spec fails because associations defined using :dependent => :delete_all
don''t call the destroy() method on associated objects. I''m not
sure if I can
avoid creating and counting objects after all

thanks
dave
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On 6/8/07, David Green <justnothing at tiscali.co.uk>
wrote:
>
>
>
> On 6/7/07, David Chelimsky <dchelimsky at gmail.com> wrote:
> > On 6/7/07, David Green <pocketsized at tiscali.co.uk> wrote:
> > > I have the following model:
> > >
> > > class Book < ActiveRecord::Base
> > >   has_many :taggings, :dependent => :delete_all
> > >   has_many :tags, :through => :taggings
> > > end
> > >
> > > is it possible to check that associated taggings are being
destroyed
> > > using mocks? I don''t want to test that rails is deleting
the
> > > associations, I want to test that I have specified the
association as
> > > a dependent one.
> > >
> > > the only way I can think of is to use fixtures (or create real
> > > associations in the before callback) and then check that they
have
> > > been deleted using Taggings.count(). Can it be done using mocks
> > > instead?
> > >
> > > describe Book do
> > >
> > >   before do
> > >     @book = mock_model(Book)
> > >     @tagging = mock_model(Tagging)
> > >     @book.stub!(:taggings).and_return([@tagging, @tagging])
> > >   end
> > >
> > >   it "should delete associated taggings when destroyed"
do
> > >   end
> > >
> > > end
> >
> > You have to create a real book, but you can create a mock tagging:
>
> Actually, you don''t have to save it - you can use #new instead of
create:
>
> book = Book.new(:title => "the book")
> book.taggings << tagging = mock_model(Tagging, :[]= => true, :save
=> true)
> tagging.should_receive(:destroy)
> book.destroy
>
> >
> > Cheers,
> > David
> >
>
> hi David
>
> that spec fails because associations defined using :dependent =>
:delete_all
> don''t call the destroy() method on associated objects.
I''m not sure if I can
> avoid creating and counting objects after all
Ah - i had set up :dependent => :destroy. Bummer.
>
> thanks
> dave
> --
> View this message in context:
http://www.nabble.com/checking-associated-objects-have-been-deleted-tf3882933.html#a11028074
> Sent from the rspec-users mailing list archive at Nabble.com.
>
> _______________________________________________
> rspec-users mailing list
> rspec-users at rubyforge.org
> http://rubyforge.org/mailman/listinfo/rspec-users
>