implement find permissions by role's ID method

src/main/java/com/example/springdemo/serviceImpl/PermissionsServiceImpl.java

@@ -1,12 +1,14 @@
-package com.example.springdemo.service;
+package com.example.springdemo.serviceImpl;
 
 import com.example.springdemo.dao.PermissionsRepository;
 import com.example.springdemo.dao.RolesPermissionsRepository;
 import com.example.springdemo.entities.RBAC.Permissions;
+import com.example.springdemo.service.PermissionsService;
 import jakarta.annotation.Resource;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
+import java.util.ArrayList;
 import java.util.List;
 import java.util.Optional;
 
@@ -54,4 +56,15 @@ public class PermissionsServiceImpl implements PermissionsService {
     public List<Permissions> findAllPermissions() {
         return permissionsRepository.findAll();
     }
+
+    //根据角色id查询权限
+    @Override
+    public List<Permissions> findPermissionsByRoleId(Long roleId) {
+        List<Long> permissionsId = rolesPermissionsRepository.findPermissionsIdByRolesId(roleId);
+        List<Permissions> permissions = new ArrayList<>();
+        for (Long permissionId : permissionsId) {
+            permissions.add(permissionsRepository.findById(permissionId).orElseThrow());
+        }
+        return permissions;
+    }
 }