Using isolate_apps for Testing Model Documentation Generation

Based on your requirements, Django's isolate_apps utility is the perfect solution for your testing needs. This utility allows you to create temporary model classes that are registered in an isolated apps registry, preventing them from interfering with your main application.

Solution

You should modify your test code to use isolate_apps as follows:

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from django.test import TestCase
from django.test.utils import isolate_apps
from django.db import models

class TestDocumentationGeneration(TestCase):
    @isolate_apps('test_app')
    def test_documentation_generation(self):
        # Define your test model within the test method
        class TestModel(models.Model):
            """Test model docstring for documentation generation."""
            name = models.CharField(max_length=100)
            description = models.TextField()
            
            class Meta:
                app_label = 'test_app'
        
        # Create an instance if needed
        model_instance = TestModel(name='Test', description='This is a test.')
        
        # Your documentation generation code here
        # For example:
        # docs = generate_documentation(TestModel)
        # self.assertIn('name', docs)
        # self.assertIn('description', docs)

Alternative Approach with Context Manager

You can also use isolate_apps as a context manager:

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from django.test import TestCase
from django.test.utils import isolate_apps
from django.db import models

class TestDocumentationGeneration(TestCase):
    def test_documentation_generation(self):
        with isolate_apps('test_app'):
            class TestModel(models.Model):
                """Test model docstring for documentation generation."""
                name = models.CharField(max_length=100)
                description = models.TextField()
                
                class Meta:
                    app_label = 'test_app'
            
            # Create an instance if needed
            model_instance = TestModel(name='Test', description='This is a test.')
            
            # Your documentation generation code here

Accessing the Isolated Apps Registry

If you need to access the isolated apps registry, you can use the kwarg_name parameter:

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@isolate_apps('test_app', kwarg_name='apps')
def test_documentation_generation(self, apps):
    class TestModel(models.Model):
        """Test model docstring for documentation generation."""
        name = models.CharField(max_length=100)
        description = models.TextField()
        
        class Meta:
            app_label = 'test_app'
    
    # Verify the model is in the isolated registry
    self.assertIs(apps.get_model('test_app', 'TestModel'), TestModel)
    
    # Your documentation generation code here

This approach ensures that your test models:

1. Only exist during test execution
2. Are not added to the main AppConfig
3. Can be used solely for testing your documentation generation method

The models will be automatically cleaned up after the test is complete, preventing any interference with your application's normal behavior.