I have been picking up Django for a month or two and don't have a strong education in programming, so bear with me. It may be easier than I've found it.
My project is extending the Polls app from the tutorial with a variety of different question types. Each question type will have different answer fields and options. Depending on the Answer_Type set, I want to show (or not show) relevant Inlines from the models for . I've found how to overload 'add' and 'change' views in ModelAdmin.
class Question(models.Model):
ANSWER_TYPE_CHOICES = (
('CH', 'Choice'),
('SA', 'Short Answer'),
('LA', 'Long Answer'),
('E3', 'Expert Judgement of Probabilities'),
('E4', 'Expert Judgment of Values'),
('RR', 'Risk Rating'),
)
answer_type = models.CharField(max_length = 2,
choices= ANSWER_TYPE_CHOICES,
default='SA')
question_text = models.CharField(max_length=200, default = "nil")
max_entries = models.IntegerField(default = 1)
man_index = models.IntegerField(default = 0)
and (2 examples - first one needs no Inline, second one does, to allow per-question definition of risk ratings) :
class Long_Answer(models.Model):
question = models.ForeignKey(Question, on_delete=models.CASCADE)
user = models.ForeignKey(User, on_delete=models.CASCADE, default = 1)
long_answer = models.CharField(max_length=2000)
def __str__(self):
return self.long_answer
class Estimated_risk(models.Model):
# This is for those situations where the aggregate estimate is expected to be a more reliable expert judgment than the paramaterised (prob, cons) estimate.
# Risk value (a number) would be a real-world expected value of losses, for example
# It would be appropriate for a question to have risk and confidence
risk_value = models.DecimalField(max_digits = 4, decimal_places = 3)
risk_definition = models.CharField(max_length = 250)
risk_short_name = models.CharField(max_length = 10)
The admin.py class I wrote to realise that I don't know how to solve this problem (this does not work, but hopefully communicates what I hoped would happen):
`class QuestionAdmin(admin.ModelAdmin):
fieldsets = [
('Question', {'fields': ['question_text']}),
('Type', {'fields': ['answer_type'], 'classes': ['collapse']}),
('Maximum Answers per User', {'fields': ['max_entries']}),
('Presentation order (unique)', {'fields': ['man_index']}),
]
inlines =()
def set_inlines(self, request, object_id, form_url='', extra_context = None):
if self.fieldsets['Type'] == 'CH':
return [ChoiceInline]
if self.fieldsets['Type'] == 'SA':
return None
if self.fieldsets['Type'] == 'LA':
return None
if self.fieldsets['Type'] == 'E3':
return None
if self.fieldsets['Type'] == 'E4':
return None
if self.fieldsets['Type'] == 'RR':
return [RiskInline]
inlines = set_inlines(self)`
