Add comprehensive tests for Parks API and models

- Implemented extensive test cases for the Parks API, covering endpoints for listing, retrieving, creating, updating, and deleting parks.
- Added tests for filtering, searching, and ordering parks in the API.
- Created tests for error handling in the API, including malformed JSON and unsupported methods.
- Developed model tests for Park, ParkArea, Company, and ParkReview models, ensuring validation and constraints are enforced.
- Introduced utility mixins for API and model testing to streamline assertions and enhance test readability.
- Included integration tests to validate complete workflows involving park creation, retrieval, updating, and deletion.

rides/models/rides.py

@@ -138,6 +138,48 @@ class Ride(TrackedModel):
     class Meta:
         ordering = ['name']
         unique_together = ['park', 'slug']
+        constraints = [
+            # Business rule: Closing date must be after opening date
+            models.CheckConstraint(
+                name="ride_closing_after_opening",
+                check=models.Q(closing_date__isnull=True) | models.Q(opening_date__isnull=True) | models.Q(closing_date__gte=models.F("opening_date")),
+                violation_error_message="Closing date must be after opening date"
+            ),
+            # Business rule: Height requirements must be logical
+            models.CheckConstraint(
+                name="ride_height_requirements_logical",
+                check=models.Q(min_height_in__isnull=True) | models.Q(max_height_in__isnull=True) | models.Q(min_height_in__lte=models.F("max_height_in")),
+                violation_error_message="Minimum height cannot exceed maximum height"
+            ),
+            # Business rule: Height requirements must be reasonable (between 30 and 90 inches)
+            models.CheckConstraint(
+                name="ride_min_height_reasonable",
+                check=models.Q(min_height_in__isnull=True) | (models.Q(min_height_in__gte=30) & models.Q(min_height_in__lte=90)),
+                violation_error_message="Minimum height must be between 30 and 90 inches"
+            ),
+            models.CheckConstraint(
+                name="ride_max_height_reasonable",
+                check=models.Q(max_height_in__isnull=True) | (models.Q(max_height_in__gte=30) & models.Q(max_height_in__lte=90)),
+                violation_error_message="Maximum height must be between 30 and 90 inches"
+            ),
+            # Business rule: Rating must be between 1 and 10
+            models.CheckConstraint(
+                name="ride_rating_range",
+                check=models.Q(average_rating__isnull=True) | (models.Q(average_rating__gte=1) & models.Q(average_rating__lte=10)),
+                violation_error_message="Average rating must be between 1 and 10"
+            ),
+            # Business rule: Capacity and duration must be positive
+            models.CheckConstraint(
+                name="ride_capacity_positive",
+                check=models.Q(capacity_per_hour__isnull=True) | models.Q(capacity_per_hour__gt=0),
+                violation_error_message="Hourly capacity must be positive"
+            ),
+            models.CheckConstraint(
+                name="ride_duration_positive",
+                check=models.Q(ride_duration_seconds__isnull=True) | models.Q(ride_duration_seconds__gt=0),
+                violation_error_message="Ride duration must be positive"
+            ),
+        ]
 
     def __str__(self) -> str:
         return f"{self.name} at {self.park.name}"