fix(policy): update policy_map by calling add_policy

[Victor-Bayim]

This Pull Request fixes the issue where add_policies does not update the internal policy_map when adding new policies (see #356). Previously, add_policies simply appended new rules to the policy list without invoking add_policy, causing priority and other related information to be missing from policy_map. The main changes include:

Invoke add_policy for Each Rule

In add_policies, each new rule is added via the add_policy method to ensure that both the policy list and the policy_map are updated.
This approach is aligned with the Go Casbin implementation for consistency.
Duplicate Check

If any rule already exists, the function returns False to prevent adding duplicates.
Testing

All existing test cases have been run locally, and they pass successfully.
Additional tests for priority-based rules can be added in the future to further confirm that policy_map is correctly updated.
By applying this fix, add_policies now properly maintains the internal data structures, preventing access control logic errors due to an out-of-sync policy_map. Feedback and reviews are welcome!

[CLAassistant]

All committers have signed the CLA.

[Copilot]

Pull Request Overview

This PR fixes an issue where add_policies did not update the policy_map correctly by invoking add_policy for each new rule.

• Rules are now added via add_policy in add_policies to ensure proper updates to both the policy list and the policy_map.
• The update_policy and update_policies methods have been revised to update the policy_map consistently, and the remove_* functions now rebuild policy_map after modifications.

Comments suppressed due to low confidence (1)

casbin/model/policy.py:175

• The removal of the p_priority check in update_policy changes the behavior by allowing rule priority to be updated without validation. Verify that this change is intentional and consider reintroducing a safeguard if maintaining the existing priority is required.

        ast.policy[rule_index] = new_rule

[Copilot]

[nitpick] The logic to rebuild policy_map is duplicated in several methods (remove_policy, remove_filtered_policy_returns_effects, remove_filtered_policy). Consider refactoring this into a helper function to improve maintainability.

Suggested change

	new_map = {}
	for idx, r in enumerate(assertion.policy):
	new_map[DEFAULT_SEP.join(r)] = idx
	assertion.policy_map = new_map
	assertion.policy_map = self._rebuild_policy_map(assertion.policy)