Added description and question and answer models

project_directory/three_d_viewer/models.py

@@ -20,5 +20,25 @@ class Category(CommonInfo):
 
 class Sample(CommonInfo):
     model_filename = models.CharField(max_length=1000)
+    description = models.CharField(max_length=2000, default='', blank=True, null=True)
     parent = models.ForeignKey(Category, blank=True, null=True,
                                on_delete=models.SET_NULL)
+
+
+class Question(models.Model):
+    text = models.CharField(max_length=2000)
+    sample = models.ForeignKey(Sample, related_name='questions')
+
+    def correct_answers(self):
+        return self.answers.filter(correct = True)
+    
+    def __unicode__(self):
+        return self.text
+    
+class Answer(models.Model):
+    text = models.CharField(max_length=2000)
+    correct = models.BooleanField(default=False)
+    question = models.ForeignKey(Question, related_name='answers')
+    
+    def __unicode__(self):
+        return self.text