models updated

project/allocation/admin.py

 from django.contrib import admin
 
-# Register your models here.
+from .models import Applicant,Choice,Application
+
+admin.site.register(Choice)
+
+class ChoiceInline(admin.TabularInline):
+	model = Application  #https://stackoverflow.com/questions/5947843/django-how-does-manytomanyfield-with-through-appear-in-admin
+	extra = 2 
+
+class ApplicantAdmin(admin.ModelAdmin):
+	fields = ['name', 'rank']
+	inlines = [ChoiceInline]
+
+admin.site.register(Applicant, ApplicantAdmin)

project/allocation/migrations/0001_initial.py

 # -*- coding: utf-8 -*-
-# Generated by Django 1.11.5 on 2017-10-01 08:48
+# Generated by Django 1.11.5 on 2017-10-01 17:09
 from __future__ import unicode_literals
 
 from django.db import migrations, models
@@ -22,13 +22,30 @@ class Migration(migrations.Migration):
                 ('rank', models.IntegerField()),
             ],
         ),
+        migrations.CreateModel(
+            name='Application',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('priority', models.IntegerField()),
+                ('applicant', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='allocation.Applicant')),
+            ],
+        ),
         migrations.CreateModel(
             name='Choice',
             fields=[
                 ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
                 ('choice_name', models.CharField(max_length=200)),
                 ('capacity', models.IntegerField()),
-                ('applicant', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='allocation.Applicant')),
             ],
         ),
+        migrations.AddField(
+            model_name='application',
+            name='choice',
+            field=models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='allocation.Choice'),
+        ),
+        migrations.AddField(
+            model_name='applicant',
+            name='choices',
+            field=models.ManyToManyField(through='allocation.Application', to='allocation.Choice'),
+        ),
     ]

project/allocation/models.py

 from django.db import models
 
+class Choice(models.Model):
+	choice_name = models.CharField(max_length=200)
+	capacity = models.IntegerField()
+	def __str__(self):
+		return self.choice_name
+
 class Applicant(models.Model):
+	choices = models.ManyToManyField(Choice, through='Application')
 	name = models.CharField(max_length=200)
 	rank = models.IntegerField()
 	def __str__(self):
 		return self.name
+	def ordered_choices(self):   #https://stackoverflow.com/questions/934779/django-order-a-model-by-a-many-to-many-field
+		"Return a properly ordered set of choices"
+		return self.choices.all().order_by('application__priority')
 
-class Choice(models.Model):
+class Application(models.Model):
+	choice = models.ForeignKey(Choice, on_delete=models.CASCADE)
 	applicant = models.ForeignKey(Applicant, on_delete=models.CASCADE)
-	choice_name = models.CharField(max_length=200)
-	capacity = models.IntegerField()
-	def __str__(self):
-		return self.choice_name
-
+	priority = models.IntegerField()
+	class Meta:
+		# if you have an inline configured in the admin, this will 
+		# make the roles order properly 
+		ordering = ['priority'] 
\ No newline at end of file

project/temp.txt

+from allocation.models import Choice,Application,Applicant
+a1=Applicant.objects.create(name="kunal" , rank=3)
+a2=Applicant.objects.create(name="aman" , rank=59)
+a3=Applicant.objects.create(name="eashan" , rank=34)
+c1=Choice.objects.create(choice_name="EE",capacity=3)
+c2=Choice.objects.create(choice_name="CSE",capacity=3)
+c3=Choice.objects.create(choice_name="ME",capacity=3)
+
+a1=Applicant.objects.get(id=1)
+a2=Applicant.objects.get(id=2)
+a3=Applicant.objects.get(id=3)
+c1=Choice.objects.get(id=1)
+c2=Choice.objects.get(id=2)
+c3=Choice.objects.get(id=3)
+
+m1=Application(choice=c1,applicant=a1,priority=1)
+m2=Application(choice=c2,applicant=a1,priority=2)
+m3=Application(choice=c3,applicant=a2,priority=1)
+m4=Application(choice=c1,applicant=a3,priority=1)
+m1.save()