Problem hiding fields from admin page based on another fields value

[Hilde Rafaelsen]

Hello,

In my django admin page I want to hide some filelds from users if a special field value is set. I have tried different solutions to solve my problem but is stucked and hope someone can help me,

If you look at my model I want to hide the field readinessDescription if readiness value is False (no), when the user log into admin page. 

In model.py:

class RequestForChange (models.Model):

rfc = models.AutoField (primary_key=True, help_text="This is the grey text")

heading = models.CharField("Heading", max_length=50)

       readiness = models.NullBooleanField("Readiness", blank=True, null=True)

       readinessDescription = models.TextField("Description of readiness", max_length=250, blank=True, null=True)

I found some hints on the web about using get_form from my RequestForChangeAdmin page, but it won't work because i get this error 'NoneType' object has no attribute 'readiness'

Here is what I have in admin.py:

class RequestForChangeAdmin(admin.ModelAdmin):

formfield_overrides = {

models.ManyToManyField: {'widget': CheckboxSelectMultiple},

}

list_display = ('rfc', 'heading', 'enviroment', 'status')

search_fields = ('changeId',)

list_filter = ('enviroment', 'acceptAT', 'status')

date_hierarchy = 'criticalDate'

inline = [RequestForChangeInline]

def get_form(self, request, obj=None, **kwargs):

form = super(RequestForChangeAdmin, self).get_form(request, obj, **kwargs)

print obj

if obj.readiness == True:

self.exclude = ("readinessDescription", )

form = super(RequestForChangeAdmin, self).get_form(request, obj, **kwargs)

return form

[Timothy W. Cook]

Is 'readiness' really a tri-state flag? 

Anyway you may want to test if obj.readiness exists, and is TRUE.

if obj.readiness and obj.readiness == TRUE: 

HTH,

Tim

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[Hilde Rafaelsen]

Hi,

 

Thanks for the response.

 

What do you mean by tri-state?

 

I changed my get_form to this:

def get_form(self, request, obj=None, **kwargs):

                               form = super(RequestForChangeAdmin, self).get_form(request, obj, **kwargs)

                               if obj:

                                               if obj.readiness == True:

                                                               self.exclude = ("readinessDescription", )

                                                               form = super(RequestForChangeAdmin, self).get_form(request, obj, **kwargs)

                               return form

 

No my code run without errors, but nothing happpends though ☺

 

I have tried to change the readiness filds to yes and no, but the field readiness descriptions is always displayed. Maybe it is not possibly to get a fields attribute value from admin before the admin form is posted or stored in database? Do you know?

 

Regards,

Hilde from Norway

[Hilde Rafaelsen]

and one more thing. My obj is always none (empty), why is that?

[Timothy W. Cook]

What do you mean by tri-state?

You are using a field that allows three states: TRUE, FALSE and NULL. 

If I understand the model, readiness would either be TRUE or FALSE.  But if you do not want to change your field type to:

readiness = models.BooleanField("Readiness", blank=True)

 

then try changing:

if obj.readiness == True:

to:

if obj.readiness and obj.readiness == True:

or just:

if obj.readiness:

Will give you the same result.

This way if it doesn't exist it will not fail on the  '== TRUE' test. 

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[Timothy W. Cook]

Maybe it is not possibly to get a fields attribute value from admin before the admin form is posted or stored in database? Do you know?

Yes, it is possible.  I use this to set which fields are readonly before defining the fieldsets.  It works great.

def get_form(self, request, obj=None, **kwargs):

        try:

            if obj.published:

                self.readonly_fields = ['prj_name','published','lang','schema_code','description','sem_attr','resource_uri','asserts',

                                        'label','performer_p','function','mode','simple_function','simple_mode',]

        except (AttributeError, TypeError) as e:

            self.readonly_fields = ['published','schema_code']

        return super(ParticipationAdmin, self).get_form(request, obj, **kwargs)

[Hilde Rafaelsen]

Thanx,

I now changed my if test to just if obj.readines but then I get the error message 'NoneType' object has no attribute 'readiness'

I have tried with several fields from my model, but I always get this error. I guess it must be something essential I am doing wrong here, since my obj seems to be none always...

I have get_form inside my modelAdmin class.

[Hilde Rafaelsen]

I have uploaded my model and admin file and hope someone can tell me why I can't get my get_form method to work :)

Regards,

Hilde

[Timothy W. Cook]

try this get_form:

def get_form(self, request, obj=None, **kwargs):

if obj.readiness:

self.exclude = ("readinessDescription", )

return super(RequestForChangeAdmin, self).get_form(request, obj, **kwargs)

I have never used 'exclude' but it looks like yours should work.

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[Hilde Rafaelsen]

I get same error as before; 'NoneType' object has no attribute 'readiness' when I changed to your excample. I don't understand why this is not working for me, but for everyone else....

Is it something I have forgot to import? I hope you can take a quick look at my uploaded files. Is it ok to just use get_form from the admin class directly, or do I need to create a Form class as well?