课程分类

src/main/java/xyz/playedu/api/bus/CourseCategoryBus.java

@@ -0,0 +1,40 @@
+package xyz.playedu.api.bus;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
+import xyz.playedu.api.domain.CourseCategory;
+import xyz.playedu.api.exception.NotFoundException;
+import xyz.playedu.api.service.CourseCategoryService;
+
+/**
+ * @Author 杭州白书科技有限公司
+ * @create 2023/2/24 13:57
+ */
+@Component
+public class CourseCategoryBus {
+
+    @Autowired
+    private CourseCategoryService categoryService;
+
+    public String compParentChain(Integer parentId) throws NotFoundException {
+        String parentChain = "";
+        if (parentId != 0) {
+            CourseCategory parentCourseCategory = categoryService.getById(parentId);
+            if (parentCourseCategory == null) {
+                throw new NotFoundException("父级分类不存在");
+            }
+            String pc = parentCourseCategory.getParentChain();
+            parentChain = pc == null || pc.length() == 0 ? parentId + "" : pc + "," + parentId;
+        }
+        return parentChain;
+    }
+
+    public static String childrenParentChain(CourseCategory CourseCategory) {
+        String prefix = CourseCategory.getId() + "";
+        if (CourseCategory.getParentChain() != null && CourseCategory.getParentChain().length() > 0) {
+            prefix = CourseCategory.getParentChain() + "," + prefix;
+        }
+        return prefix;
+    }
+
+}