谷粒商城 (十三) --------- 商品服务 API 三级分类 ④ 删除、新增分类

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需求：要求对三级菜单有增加和删除的功能，但只有一级和二级的菜单有增加的功能，空的没有子菜单的菜单才能进行删除。

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一、删除分类前端编写

A、页面部分

注意圈红圈的为新增的内容

B、方法部分

C、代码

<template>
  <el-tree
    :data="menus"
    :props="defaultProps"
    :expand-on-click-node="false"
    show-checkbox="true"
    node-key="catId"
    :default-expanded-keys="expandedKey"
    ><span class="custom-tree-node" slot-scope="{ node, data }">
      <span>{{ node.label }}span>
      <span>
        <el-button
          v-if="node.level <= 2"
          type="text"
          size="mini"
          @click="() => append(data)"
        >
          Append
        el-button>
        <el-button
          v-if="node.childNodes.length == 0"
          type="text"
          size="mini"
          @click="() => remove(node, data)"
        >
          Delete
        el-button>
      span>
    span>el-tree
  >
template>

<script>
export default {
  data() {
    return {
      menus: [],
      expandedKey: [],
      defaultProps: {
        children: "children",
        label: "name",
      },
    };
  },
  created() {
    this.getMenus();
  },
  methods: {
    getMenus() {
      this.$http({
        url: this.$http.adornUrl("/product/category/list/tree"),
        method: "get",
      }).then(({ data }) => {
        console.log("成功获取后台数据", data.data);
        this.menus = data.data;
      });
    },
    append(data) {
      const newChild = { id: id++, label: "testtest", children: [] };
      if (!data.children) {
        this.$set(data, "children", []);
      }
      data.children.push(newChild);
    },

    remove(node, data) {
      this.$confirm(`是否删除【${data.name}】菜单?`, "提示", {
        confirmButtonText: "确定",
        cancelButtonText: "取消",
        type: "warning",
      })
        .then(() => {
          var ids = [data.catId];
          this.$http({
            url: this.$http.adornUrl("/product/category/delete"),
            method: "post",
            data: this.$http.adornData(ids, false),
          }).then(({ data }) => {
            this.$message({
              message: "菜单删除成功",
              type: "success",
            });
            // 刷新出新的菜单
            this.getMenus();
            // 设置需要默认展开的菜单
            this.expandedKey = [node.parent.data.catId]
          });
        })
        .catch(() => {});
    },
  },
};
script>

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二、编写删除后台

逻辑删除：表中某一字段可以标志该条数据是否被删除，不是真正的从数据库表中直接删除，就比如 category 表中的 show_status 字段，0表示删除，1表示显示

物理删除：直接把该条数据从数据库中 delete 掉

这里我们编写的删除则是使用逻辑删除。。。。。

CategoryController 中：

/**
* 删除
* @RequestBody : 获取请求体, 必须发送 post 请求
* SpringMVC 自动将请求体的数据(json), 转为对应的对象
*/
@RequestMapping("/delete")
public R delete(@RequestBody Long[] catIds){
   //1、检查当前删除的菜单, 是否被别的地方引用
   //categoryService.removeByIds(Arrays.asList(catIds));

   categoryService.removeByMenuIds(Arrays.asList(catIds));
   return R.ok();
}
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CategoryService 及 CategoryServiceImpl 中：

@Override
public void removeByMenuIds(List<Long> asList) {
    // TODO 1、检查当前删除的菜单, 是否在别的地方被引用
    // 逻辑删除
    baseMapper.deleteBatchIds(asList);
}
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逻辑删除步骤：

A、配置全局的逻辑删除规则
B、配置逻辑删除的组件(省略)
C、加上逻辑删除注解 @TopicLogic

MyBatis-Plus 中配置逻辑删除：

实体类属性加上 @TableLogic 注解

三、删除测试

四、新增分类

主要是编写前端的代码，后端我们调用框架生成的 save 方法去保存

<template>
  <div>
    <el-tree
      :data="menus"
      :props="defaultProps"
      :expand-on-click-node="false"
      show-checkbox="true"
      node-key="catId"
      :default-expanded-keys="expandedKey"
      ><span class="custom-tree-node" slot-scope="{ node, data }">
        <span>{{ node.label }}</span>
        <span>
          <el-button
            v-if="node.level <= 2"
            type="text"
            size="mini"
            @click="() => append(data)"
          >
            Append
          </el-button>
          <el-button
            v-if="node.childNodes.length == 0"
            type="text"
            size="mini"
            @click="() => remove(node, data)"
          >
            Delete
          </el-button>
        </span>
      </span></el-tree
    >
    <el-dialog title="提示" :visible.sync="dialogVisible" width="30%">
      <el-form :model="form">
        <el-form-item label="分类名称">
          <el-input v-model="category.name" autocomplete="off"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="dialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addCategory">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      category: { name: "", parentCid: 0, catLevel: 0, showStatus: 1, sort: 0 },
      dialogVisible: false,
      menus: [],
      expandedKey: [],
      defaultProps: {
        children: "children",
        label: "name",
      },
    };
  },
  created() {
    this.getMenus();
  },
  methods: {
    getMenus() {
      this.$http({
        url: this.$http.adornUrl("/product/category/list/tree"),
        method: "get",
      }).then(({ data }) => {
        console.log("成功获取后台数据", data.data);
        this.menus = data.data;
      });
    },
    append(data) {
      this.dialogVisible = true;
      this.category.parentCid = data.catId;
      this.category.catLevel = data.catLevel * 1 + 1;
    },

    addCategory() {
      this.$http({
        url: this.$http.adornUrl("/product/category/save"),
        method: "post",
        data: this.$http.adornData(this.category, false),
      }).then(({ data }) => {
        this.$message({
          message: "菜单保存成功",
          type: "success",
        });
        //  关闭对话框
        this.dialogVisible = false;
        // 刷新出新的菜单
        this.getMenus();
        // 设置需要默认展开的菜单
        this.expandedKey = [this.category.parentCid];
      });
    },

    remove(node, data) {
      this.$confirm(`是否删除【${data.name}】菜单?`, "提示", {
        confirmButtonText: "确定",
        cancelButtonText: "取消",
        type: "warning",
      })
        .then(() => {
          var ids = [data.catId];
          this.$http({
            url: this.$http.adornUrl("/product/category/delete"),
            method: "post",
            data: this.$http.adornData(ids, false),
          }).then(({ data }) => {
            this.$message({
              message: "菜单删除成功",
              type: "success",
            });
            // 刷新出新的菜单
            this.getMenus();
            // 设置需要默认展开的菜单
            this.expandedKey = [node.parent.data.catId];
          });
        })
        .catch(() => {});
    },
  },
};
</script>

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后台代码如图：