自关联 递归

无限极自关联递归就是用自己关联自己的方法 无限极的一直关联下去

1.model:

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class WorkOrder(models.Model):
    name = models.CharField(max_length=200)
    pid = models.ForeignKey('self', models.SET_NULL, null=True, blank=True, verbose_name='自关联')

    def __str__(self):
        return self.name

2.树:

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def xTree(datas):
    lists = []  # 定义空列表
    tree = {}  # 定义空字典
    for i in datas:
        item = i
        tree[item['id']] = item

    for i in datas:
        obj = i
        if not obj['pid']:
            root = tree[obj['id']]
            lists.append(root)
        else:
            parent_id = obj['pid']
            if 'children' not in tree[parent_id]:
                tree[parent_id]['children'] = []
            tree[parent_id]['children'].append(tree[obj['id']])
    return lists

3.查询代码:

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def get(self, request):
    cai = WorkOrder.objects.all()
    ser = WorkOrderSerializer(cai, many=True)
    data = xTree(ser.data)
    return Response(data)

4.vue用父子组件传参实现渲染:

子页面负责循环:

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<template>
  <div>
    <li>
      <a :href="'/cate/?id='+data.id">{{data.name}}</a>
      <ul v-if="data.children && data.children.length > 0">
        <antwork v-for="child in data.children" :key="child.id" :data='child' />
      </ul>
    </li>
  </div>
</template>

<script>
export default {
  name:"antwork",
  props:['data'],
}
</script>

<style>
ul{
  padding-left: 20px;
  list-style: none;
}
</style>

5.父页面负责渲染:

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<template>
  <div>
    <antwork :data="data" />
    <br>
    <select v-model="pid">
      <option v-model="pid" :value="0">主</option>
      <option v-for="i in nr" :value="i.id" :key="i.id">{{i.name}}</option>
    </select>
  </div>
</template>

<script>
import axios from 'axios'
import antwork from "./antwork"

export default {
  data() {
    return {
      data:{},
      nr:[],
      pid:'',
    }
  },
  components:{
    antwork,
  },
  created() {
    this.get_data()
    axios({
      url:"http://127.0.0.1:8000/app2/work/"
    }).then(res =>{
      this.nr = res.data
    })
  },
  methods: {
    get_data:function(){
      axios.get("http://127.0.0.1:8000/app2/workorder/").then(res=>{
        console.log(res.data);
        var mytree = {"id":0,name:""};
        mytree['children'] = res.data;
        this.data = mytree
      })
    },
  },
}
</script>
<style>

</style>