[Solved] Why does this Django model test NOT raise an error?class Employee(models.Model): salary = models.PositiveIntegerField() class EmployeeTest(TestCase): def test_negative_salary(self):... | Django

Django - Testing Django Applications

Why does this Django model test NOT raise an error?

class Employee(models.Model):
    salary = models.PositiveIntegerField()

class EmployeeTest(TestCase):
    def test_negative_salary(self):
        emp = Employee(salary=-100)
        emp.save()

ABecause the test case disables validation

BBecause Negative salary is allowed by PositiveIntegerField

CBecause model field validation is not automatically run on save()

DBecause salary field is nullable

Step-by-Step Solution

Solution:

Step 1: Understand PositiveIntegerField behavior
It expects positive integers but does not enforce validation on save() automatically.
Step 2: Why no error on save()
Django model field validation runs only when explicitly called or via forms, not on save().
Final Answer:
Model saves without error because validation is not automatic on save -> Option C
Quick Check:
save() skips validation unless manually invoked [OK]

Quick Trick: save() does not auto-validate fields [OK]

Common Mistakes:

MISTAKES

Assuming save() runs full validation
Confusing PositiveIntegerField behavior
Expecting errors without calling full_clean()

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Why does this Django model test NOT raise an error?

Step 1: Understand PositiveIntegerField behavior

Step 2: Why no error on save()

Final Answer:

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