Add required on_delete attribute, fixes no-value-for-parameter

since we're testing with latest Django versions this is now
required for all ForeignKey fields

Author: atodorov

test/input/func_noerror_foreign_key_attributes.py

@@ -12,8 +12,8 @@ class SomeModel(models.Model):
 
 
 class OtherModel(models.Model):
-    something = models.ForeignKey(SomeModel)
-    elsething = models.OneToOneField(SomeModel)
+    something = models.ForeignKey(SomeModel, on_delete=models.CASCADE)
+    elsething = models.OneToOneField(SomeModel, on_delete=models.CASCADE)
 
     def something_doer(self):
         part_a = '%s - %s' % (self.something.name, self.something.timestamp)

test/input/func_noerror_foreign_key_ids.py

@@ -10,7 +10,7 @@ class SomeModel(models.Model):
 
 
 class SomeOtherModel(models.Model):
-    some_model = models.ForeignKey(SomeModel)
+    some_model = models.ForeignKey(SomeModel, on_delete=models.CASCADE)
     number = models.IntegerField()
 
     def do_something(self):

test/input/func_noerror_foreign_key_sets.py

@@ -18,11 +18,12 @@ def get_first(self):
 
 class OtherModel(models.Model):
     count = models.IntegerField()
-    something = models.ForeignKey(SomeModel)
+    something = models.ForeignKey(SomeModel, on_delete=models.CASCADE)
 
 
 class ThirdModel(models.Model):
-    whatever = models.ForeignKey(SomeModel, related_name='whatevs')
+    whatever = models.ForeignKey(SomeModel, related_name='whatevs',
+                                 on_delete=models.CASCADE)
 
 
 def count_whatevers():

test/input/func_noerror_foreignkeys.py

@@ -17,8 +17,8 @@ class ISBN(models.Model):
 
 class Book(models.Model):
     book_name = models.CharField(max_length=100)
-    author = models.ForeignKey(Author)
-    isbn = models.OneToOneField(ISBN)
+    author = models.ForeignKey(Author, on_delete=models.CASCADE)
+    isbn = models.OneToOneField(ISBN, on_delete=models.CASCADE)
 
     def get_isbn(self):
         return self.isbn.value
@@ -32,7 +32,7 @@ class Fruit(models.Model):
 
 
 class Seed(models.Model):
-    fruit = ForeignKey(Fruit)
+    fruit = ForeignKey(Fruit, on_delete=models.CASCADE)
 
     def get_fruit_name(self):
         return self.fruit.fruit_name
@@ -43,7 +43,7 @@ class User(models.Model):
 
 
 class UserProfile(models.Model):
-    user = OneToOneField(User)
+    user = OneToOneField(User, on_delete=models.CASCADE)
 
     def get_username(self):
         return self.user.username