Add `ResourceModel.Update` implementation for BadgerDB

[jim-junior]

Description

Add the Update method implementation for BadgerDB. This method is responsible for updating an existing resource, incrementing its metadata version, and persisting both the current state and a new versioned entry in the local key-value store.

conveyor/internal/models/resource.go

Line 114 in 2572f4c

func (m *ResourceModel) Update(name string, resourceType string, resource types.Resource) (types.Resource, error) {

Requirements

• File Location: internal/models/resource.go
• Transactionality: The entire operation must be wrapped in a BadgerDB Update transaction to ensure the version increment and dual-key writes (primary and versioned) are atomic.
• Existence Check: The method must first verify that the resource exists. If not found, it should return a "not found" error.
• Versioning Logic:
  1. Retrieve the current version from the existing resource's metadata.
  2. Increment the version number.
  3. Update the Metadata["version"] field in the resource object.
• Dual-Key Write: The method must update two entries:
  1. The primary resource key: /resources/{resourceType}/{name}.
  2. A new versioned key: /resources/{resourceType}/{name}/{newVersionNumber}.
• Dependency Injection: The method must use the *badger.DB instance injected into the ResourceModel.
• Testing: A corresponding test case must be created in internal/models/resource_test.go.

Success Criteria

• The Update method successfully modifies records in BadgerDB within an atomic transaction.
• The version number in metadata is correctly incremented by 1.
• Both the master key and the new versioned key (e.g., /2) exist in the database after the update.
• Test Case implementation: A unit test is provided that:
  • Pre-populates BadgerDB with an initial resource (version 1).
  • Calls Update with modified data.
  • Asserts that the primary key now contains the new data and version 2.
  • Asserts that a new key ending in /2 has been created.
  • Asserts that an error is returned if trying to update a non-existent resource.

[jim-junior]

For reference implementation see PR #221