OK - for those that come after me ... I solved it thus ...
The HOBO manual (currently pp386-7) says, with regard to TRANSITIONS:
The second argument is a hash with a single item: {from => to}
This transition can only be fired in the state or states given as
from, which can be either a symbol or an array of symbols. On
completion of this transition, the record will be in the state give as
to which can be one of:
A symbol – the name of the state
A proc – if the proc takes one argument it is called with the record,
if it takes none it is instance_eval ̳d on the record. Should return
the name of the state.
A string – evaluated as a Ruby expression with in the context of the
record.
A symbol is the normal way to do this - ie {:admitted => :discharged}
To use a proc, you have to do this:
Add a method to current class ...
def remove_patient_location
self.location_id = nil
return :discharged
end
and then call that in the transition method as a proc:
lifecycle :state_field => :admission_status do
state :admitted
state :discharged , :default => true
transition :disharge_patient, { :admitted => proc
{ remove_patient_location } } ,
:available_to => :all do
end
end
Gad that made my eyes water.
My question is - given that this is such a simple update - how do you
do that with a string (the third method mentioned in the manual)
The following doesn't work:
transition :disharge_patient, { :admitted => " self.location_id =
nil , :discharged" } ,
:available_to => :all do
end
Any ideas?
DJ
On Apr 5, 12:18 pm, DJ <[email protected]> wrote:
> Having not got a reply to this, perhaps I should add something about
> what I already tried ... ?
>
> My sense from the Hobo documentation is that the important thing is to
> keep model-related stuff in the model, so I assume that the changing
> the value of a field during a transition involves an assignment within
> a method in the model.rb file.
>
> So ... I did an assignment to what I thought would be the instance
> variable of the current patient as so ...
>
> transition :disharge_patient, { :admitted => :discharged },
> :available_to => :all do
> @patient.location_id = nil
> end
>
> but that doesn't work since it thinks location_id is a method ... and
> the console tells me @patient is not defined.
>
> I've tried a few other things within the Lifecycle statement - but
> most of them crash, indicating that I'm a Ruby-Noobie.
>
> Any help on this gratefully received. I'm a bit stuck on this.
>
> Thanks
>
> DJ
>
> On Apr 4, 12:46 am, DJ <[email protected]> wrote:
>
>
>
> > Apologies if this is ridiculously straightforward - my learning-curve
> > is near vertical and I've got a bit lost on the Hobo/Rails cliff-face
> > (but enjoying it). Thanks in advance to any suggestions.
>
> > I have a very simple patient database with a lifecycle which holds
> > whether the patient is admitted or discharged - this is working
> > wonderfully using TablePlus and <transition-buttons/>.
>
> > However, I want to 'blank-out' (set to nil probably) the location
> > when a patient is discharged.
>
> > My question is how best to do this.
>
> > Any help gratefully received. Many thanks
>
> > DJ
>
> > __________________________
>
> > Relevant code in patient.rb is as follows:
>
> > class Patient < ActiveRecord::Base
>
> > hobo_model # Don't put anything above this
>
> > fields do
> > first_name :string
> > last_name :string
> > # etc - field-list cut for clarity ...
> > timestamps
> > end
>
> > belongs_to :location
> > # etc - other relationships cut for clarity
>
> > lifecycle :state_field => :admission_status do
>
> > state :admitted
> > state :discharged , :default => true
>
> > transition :admit_patient, { :discharged => :admitted } , :params
> > => [ :location ] ,
> > :available_to => :all do
>
> > end
>
> > transition :disharge_patient, { :admitted => :discharged },
> > :available_to => :all do
>
> > end
>
> > end
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