Add `ResourceModel.FindByVersion` implementation for BadgerDB

[jim-junior]

Description

Add a FindByVersion method for BadgerDB in

conveyor/internal/models/resource.go

Line 180 in 2572f4c

func (m *ResourceModel) FindByVersion(name string, resourceType string, version string) (types.Resource, error) {

from etcd to BadgerDB. This method is responsible for retrieving a specific historical version of a resource from the local key-value store and unmarshaling it into a types.Resource object.

Requirements

• File Location: internal/models/resource.go
• Transactionality: Use a BadgerDB View (read-only) transaction.
• Key Retrieval:
  • Construct the versioned key using the pattern: /resources/{resourceType}/{name}/{version}.
  • Retrieve the []byte value associated with this specific versioned key.
• Error Handling: * If the specific version key does not exist, return a descriptive "not found" error consistent with the current implementation.
  • Handle potential JSON unmarshaling errors.
• Data Transformation: Successfully unmarshal the retrieved data into the types.Resource struct.
• Dependency Injection: The method must use the injected *badger.DB instance.
• Testing: A corresponding test case must be created in internal/models/resource_test.go.

Success Criteria

• The FindByVersion method correctly retrieves historical records from BadgerDB based on the version suffix.
• The method returns the expected types.Resource object for a valid version.
• A "not found" error is returned if the resource name, type, or specific version does not exist.
• Test Case implementation: A unit test is provided that:
  • Pre-populates an in-memory BadgerDB with multiple versions of a resource (e.g., /1, /2).
  • Successfully retrieves a specific version (e.g., version "1") and verifies the data.
  • Asserts that requesting a non-existent version returns the expected error.

[jim-junior]

For reference implementation see PR #221