Here it functions on irb.
I create the model's tables and run that on irb
ruby-1.9.3-p0 :034 > Dep.new
=> #<Dep @id=nil>
ruby-1.9.3-p0 :035 > Rec.new
=> #<Rec @id=nil @dep_id=nil>
ruby-1.9.3-p0 :036 > r = Rec.new
=> #<Rec @id=nil @dep_id=nil>
ruby-1.9.3-p0 :037 > r.de
r.define_singleton_method r.dep= r.dep_id=
r.destroy!
r.dep r.dep_id r.destroy
r.destroyed?
ruby-1.9.3-p0 :037 > r.dep = Dep.new
=> #<Dep @id=nil>
ruby-1.9.3-p0 :038 > r.save
=> true
ruby-1.9.3-p0 :039 > r
=> #<Rec @id=1 @dep_id=1>
ruby-1.9.3-p0 :040 > Rec.first
=> #<Rec @id=1 @dep_id=1>
ruby-1.9.3-p0 :041 > Rec.first.dep
=> #<Dep @id=1>
ruby-1.9.3-p0 :042 > Dep.first
=> #<Dep @id=1>
ruby-1.9.3-p0 :043 > Dep.first.re
Display all 110 possibilities? (y or n)
ruby-1.9.3-p0 :043 > Dep.first.rec
=> #<Rec @id=1 @dep_id=1>
and in the other direction
ruby-1.9.3-p0 :059 > s = Dep.new
=> #<Dep @id=nil>
ruby-1.9.3-p0 :060 > s.rec = Rec.new
=> #<Rec @id=nil @dep_id=nil>
ruby-1.9.3-p0 :061 > s.save
=> true
ruby-1.9.3-p0 :062 > Dep.all
=> [#<Dep @id=1>, #<Dep @id=2>, #<Dep @id=3>]
ruby-1.9.3-p0 :063 > Rec.all
=> [#<Rec @id=1 @dep_id=2>, #<Rec @id=2 @dep_id=1>, #<Rec @id=3
@dep_id=3>]
ruby-1.9.3-p0 :064 >
ps.: I'd created another dep and rec too.
2012/9/3 inertia <[email protected]>
> I am using datamapper in association with postgres
>
> I have 2 classes defined like this:
>
> class Dep
> include DataMapper::Resource
>
> property :id, Serial
> has 1, :rec, 'Rec'
> end
>
> class Rec
> include DataMapper::Resource
>
> property :id, Serial
> belongs_to :dep, 'Dep'
>
> end
>
> When I try to do so and access the dep model I get an error: undefined
> method 'rec_id' for #
>
> As far as my research goes the model that is created does not have a one
> to one relationship. Instead it has a one to many relationship. I think
> that is the problem. Is there any way to create a one to one relationship
> in datamapper?
>
> Further, it does not let me use :required => false with 'has 1'
>
> Using belongs_to both side does not create a proper relationship. It
> creates to relationships instead which is undesirable. Can anyone help me
> with this issue?
>
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