How to set the attributes of multiple subitems of v-treeview

Question

Suppose I have the variable items with the following structure:

[
  {
    id: 1,
    name: 'value1',
    item_nested: [
      {
        id: 2,
        name: 'value2',
      },
      {
        id: 3,
        name: 'value3',
        nested_item: [
          {
            id: 4,
            name: 'value4'
          }
        ]
      }
    ]
  }
]

In v-treeview we have a props called item-children which accepts a string which allows to set which property will be referenced as a child. In the first level I want to have the attribute item_nested as a child and in the second level I want to have the nested_item as a child but is it possible to set Multiple values ​​for item-children?

Answer 1

VTreeView uses a string as the key for the child, so - without extending/overwriting the original component - I don't see a way to provide an alternative key for the child .

However, you can always "retype" the objects you want to display in VTreeview (this code snippet only applies to this specific case, but can be generalized to other cases):

new Vue({
  el: '#app',
  vuetify: new Vuetify(),
  computed: {
    // "re-keying" items:
    modifiedTreeviewItems() {
      const updateItemKeys = (items) => {
        if (!items.length) return []

        const mapped = items.map((item) => {
          const {
            item_nested = [], nested_item = [], ...rest
          } = item
          const children = item_nested.length ? item_nested : nested_item.length ? nested_item : []
          return {
            ...rest,
            children: updateItemKeys(children),
          }
        })
        return mapped
      }
      return updateItemKeys(this.treeviewItems)
    },
  },
  data() {
    return {
      treeviewItems: [{
        id: 1,
        name: 'value1',
        item_nested: [{
            id: 2,
            name: 'value2',
          },
          {
            id: 3,
            name: 'value3',
            nested_item: [{
              id: 4,
              name: 'value4'
            }]
          }
        ]
      }]
    }
  },
})

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<link href="https://cdn.jsdelivr.net/npm/vuetify@2.x/dist/vuetify.min.css" rel="stylesheet">
<div id="app">
  <v-app>
    <v-main>
      <v-container>
        <v-treeview :items="modifiedTreeviewItems" />
      </v-container>
    </v-main>
  </v-app>
</div>

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