Thanks Yuri,
that was the right way.
I've tested your idea with irb and it looks very good:
<code>
irb(main):034:0> Profile.each do |pr|
irb(main):035:1* puts "#{pr.name} | #{pr.project.count}"
irb(main):036:1> if pr.project.count == 1
irb(main):037:2> pro = pr.project.first
irb(main):038:2> pr.project.delete(pro)
irb(main):039:2> pr.save
irb(main):040:2>
irb(main):041:2* end
irb(main):042:1> puts "#{pr.project.count}"
irb(main):043:1> end
TEST1_EQP | 1
0
TEST1_STEEL | 1
0
TEST2_EQP | 1
0
TEST2_STEEL | 1
0
TEST3_EQP | 0
0
</code>
Thanks a lot again.
My problem should be solved.
Best regards,
Andreas
On 21 Jun., 16:06, Yuri <[email protected]> wrote:
> I think one of the delete methods is what you're after,
> seehttp://bit.ly/co4Mce
>
> e.g.,
>
> p = Project.first(:code => 'AAC')
> w = p.wuser.first(:login => 'mcpl')
>
> p.wuser.delete(w)
>
> Seems from the source code delete_if would be a shorter way to do it
> (the docs above are a tad ambiguous on _if's intended result,) but
> I've not used it myself.
>
> Good luck,
> Yuri
>
> On Jun 21, 6:15 am, wea_gruena <[email protected]> wrote:
>
> > Sorry for this newbie question ;-)
> > But I didn't found a good solution in the mailings.
>
> > My problem:
> > I can't remove existing associations / relations between classes.
>
> > <code>
> > class Project
> > #~ #PDMS projects
> > include DataMapper::Resource
> > property :code, String, :key => true, :length => 3, :required =>
> > true
> > #...
> > has n, :wuser, :through => Resource
> > end
>
> > class Wuser
> > #~ #Windows user (login name)
> > include DataMapper::Resource
> > property :login, String, :key => true, :required => true
> > #...
> > has n, :project, :through => Resource
> > end
> > </code>
>
> > If I try to delete a relationship with:
>
> > <code>
> > p = Project.first(:code => 'AAC')
> > p.wuser.first(:login => 'mcpl').destroy
> > </code>
>
> > My ressource (Wuser 'mcpl') will be deleted.
>
> > Where is my mistake or how can I delete one association ?
>
> > Thanks before for your answers and help !!!
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