[代码优化](v2.6)：角色管理分配菜单，菜单节点选择优化

1、选中主菜单，默认选中所有子菜单
2、取消主菜单，默认取消所有子菜单

close https://github.com/elunez/eladmin/issues/449

eladmin-system/src/main/java/me/zhengjie/modules/system/rest/MenuController.java

@@ -35,6 +35,7 @@ import org.springframework.validation.annotation.Validated;
 import org.springframework.web.bind.annotation.*;
 import javax.servlet.http.HttpServletResponse;
 import java.util.*;
+import java.util.stream.Collectors;
 
 /**
  * @author Zheng Jie
@@ -73,6 +74,18 @@ public class MenuController {
         return new ResponseEntity<>(menuService.getMenus(pid),HttpStatus.OK);
     }
 
+    @ApiOperation("根据菜单ID返回所有子节点ID，包含自身ID")
+    @GetMapping(value = "/child")
+    @PreAuthorize("@el.check('menu:list','roles:list')")
+    public ResponseEntity<Object> child(@RequestParam Long id){
+        Set<Menu> menuSet = new HashSet<>();
+        List<MenuDto> menuList = menuService.getMenus(id);
+        menuSet.add(menuService.findOne(id));
+        menuSet = menuService.getChildMenus(menuMapper.toEntity(menuList), menuSet);
+        Set<Long> ids = menuSet.stream().map(Menu::getId).collect(Collectors.toSet());
+        return new ResponseEntity<>(ids,HttpStatus.OK);
+    }
+
     @GetMapping
     @ApiOperation("查询菜单")
     @PreAuthorize("@el.check('menu:list')")
@@ -126,7 +139,7 @@ public class MenuController {
         for (Long id : ids) {
             List<MenuDto> menuList = menuService.getMenus(id);
             menuSet.add(menuService.findOne(id));
-            menuSet = menuService.getDeleteMenus(menuMapper.toEntity(menuList), menuSet);
+            menuSet = menuService.getChildMenus(menuMapper.toEntity(menuList), menuSet);
         }
         menuService.delete(menuSet);
         return new ResponseEntity<>(HttpStatus.OK);

eladmin-system/src/main/java/me/zhengjie/modules/system/service/MenuService.java

@@ -59,12 +59,12 @@ public interface MenuService {
     void update(Menu resources);
 
     /**
-     * 获取待删除的菜单
+     * 获取所有子节点，包含自身ID
      * @param menuList /
      * @param menuSet /
      * @return /
      */
-    Set<Menu> getDeleteMenus(List<Menu> menuList, Set<Menu> menuSet);
+    Set<Menu> getChildMenus(List<Menu> menuList, Set<Menu> menuSet);
 
     /**
      * 构建菜单树

eladmin-system/src/main/java/me/zhengjie/modules/system/service/impl/MenuServiceImpl.java

@@ -186,13 +186,12 @@ public class MenuServiceImpl implements MenuService {
     }
 
     @Override
-    public Set<Menu> getDeleteMenus(List<Menu> menuList, Set<Menu> menuSet) {
-        // 递归找出待删除的菜单
-        for (Menu menu1 : menuList) {
-            menuSet.add(menu1);
-            List<Menu> menus = menuRepository.findByPid(menu1.getId());
+    public Set<Menu> getChildMenus(List<Menu> menuList, Set<Menu> menuSet) {
+        for (Menu menu : menuList) {
+            menuSet.add(menu);
+            List<Menu> menus = menuRepository.findByPid(menu.getId());
             if(menus!=null && menus.size()!=0){
-                getDeleteMenus(menus, menuSet);
+                getChildMenus(menus, menuSet);
             }
         }
         return menuSet;