Problem hiding fields from admin page based on another fields value

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

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