django-smart-selects: ChainedManyToManyField value not selected after saving data via django admin

[Bernardo Garcia]

I am working with django-smart-selects 
<https://github.com/digi604/django-smart-selects> via django admin form. 
The idea that I have is try a model chaining or deployment of value fields 
accord to previous value in a previous separate field.


Accord to the first option value selected in the first field, I want that 
in the second field some values be deployed and which be of selection 
multiple. In fact, this idea I got it accomplished.


I have the following small level design approach for this:


<http://i.stack.imgur.com/kXoDq.png>



The code that is related to the above design is this:

class AffectedSegment(models.Model):
    SEGMENTO_ESCAPULA = 'ESCAPULA'
    SEGMENTO_HOMBRO = 'HOMBRO'
    SEGMENTO_CODO = 'CODO'
    SEGMENTO_ANTEBRAZO = 'ANTEBRAZO'
    SEGMENTO_CARPO_MUNECA = 'CARPO_MUNECA'
    SEGMENTO_MANO = 'MANO'
    SEGMENTO_CHOICES = (
        (SEGMENTO_ESCAPULA, u'Escápula'),
        (SEGMENTO_HOMBRO, u'Hombro'),
        (SEGMENTO_CODO, u'Codo'),
        (SEGMENTO_ANTEBRAZO, u'Antebrazo'),
        (SEGMENTO_CARPO_MUNECA, u'Carpo/Muñeca'),
        (SEGMENTO_MANO, u'Mano'),
    )
    affected_segment = models.CharField(
                   max_length=12, 
                   choices=SEGMENTO_CHOICES, 
                   blank=False, verbose_name='Segmento afectado'
                   )

    class Meta:
        verbose_name = 'Segmentos corporale'

    def __str__(self):
        return "%s" % self.affected_segment
class Movement(models.Model):
    type = models.CharField(
                      max_length=255,
                      verbose_name='Tipo de movimiento'
                      )
    corporal_segment_associated = models.ManyToManyField(
                      AffectedSegment, blank=False, 
                      verbose_name='Segmento corporal asociado'
                      )

    class Meta:
        verbose_name = 'Movimiento'

    def __str__(self):
        return "%s" % self.type
class RehabilitationSession(models.Model):
    affected_segment = models.ManyToManyField(
                      AffectedSegment,
                      verbose_name='Segmento afectado'
                      )
    movement = ChainedManyToManyField(
                      Movement, #chaining model
                      chained_field = 'affected_segment',
                      chained_model_field =     'corporal_segment_associated',
                      verbose_name='Movimiento')



Until this section all this O.K.

*MY CHALLENGES*


*1. *When I save one movement (model Movement chained) which are related to 
affected segment (affected_segment in AffectedSegment model and 
ManyToManyField in RehabilitationSession model) , after I going to this row 
or rehabilitation sessions instance via admin and the movement that I 
select before is not selected, despite of that this is saved and I can 
explore via transitivity relationship the value inside my postgresql 
database.



In this video <https://cloudup.com/iAvx9MyPn2n>, I've been exploring the 
database records and showing the behavior of my form in which is denoted my 
inconvenient

I can see that this bug/error/issue or inconvenient was happen to 
others https://github.com/digi604/django-smart-selects/issues/112


*2.* Other inconvenient is that when I select more of than one affected 
segment, in the movements field. just are deployed the values related with 
the first affected segment selected and the movements associated to the 
second selected are not deployed ...

The explanation is the following accord to this picture:

<http://i.stack.imgur.com/FoXLB.png>


When I select one second affected segment (segmento afectado field, *CODO* 
option 
in the red square number one), I want that the movements/exercises 
associated to these second affected segment that it's *CODO*


Currently, just are deployed the movements of Descenso,Elevación, 
Protracción y Retracción (options shown in the green square number two) and 
these are only or correspond to the first option of affected segment 
selected which is ESCÁPULA in the red square number one


In this video <https://cloudup.com/isLv7TsAM00> I show you this in detail.


How I can do this I want?


In some sense, in the AffectedSegment model .. should be able to know the 
option (something seem to get_element_by_id in html?) is selected for know 
when one second option is selected and shown the movements of together 
options (affected segments selected)?


I hope that post a videos don't be a problem or inconvenient


Any support or orientation would be appreciated



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