Tips for using mixins to implement CRUD (add, delete, modify, check) operations in Vue

Mixin in Vue is a very useful feature. It can encapsulate some reusable code in a mixin object, and then use mixin to introduce it in the components that need to use these codes. This method greatly improves the reusability and maintainability of the code, especially in some repeated CRUD (Create, Delete, Modify and Check) operations.

This article will introduce how to use mixin to implement CRUD operations in Vue. First, we need to understand how to create a mixin.

Creating mixin

There are many ways to create a mixin in Vue. Here we introduce one of them, which is to use the Vue.extend() method. We can encapsulate CRUD operations in a separate mixin object, create a basic CRUDMixin instance, and use a property called crud to access the methods and data in the instance.

const CRUDMixin = Vue.extend({
  data() {
    return {
      items: [],
    }
  },
  methods: {
    addItem(item) {
      this.items.push(item);
    },
    removeItem(index) {
      this.items.splice(index, 1);
    },
    updateItem(index, item) {
      this.items.splice(index, 1, item);
    },
    getItem(index) {
      return this.items[index];
    },
  }
})

export default {
  name: 'crud',
  mixin: CRUDMixin,
}

In the above code, we created a CRUDMixin object, including a data object and several methods to operate the items array. The name of this mixin is crud, you can change its name according to actual needs.

Using mixin in components

In order to use this mixin, we need to introduce it using the mixins attribute in the component. Generally, we will first define a component template, and then add the mixins that need to be introduced in the mixins array.

<template>
  <div>
    <div v-for="(item, index) in items" :key="index">
      {{ item }}
      <button @click="updateItem(index, 'new')">
        更新
      </button>
      <button @click="removeItem(index)">
        删除
      </button>
    </div>
    <input v-model="input" />
    <button @click="addItem(input)">
      添加
    </button>
  </div>
</template>

<script>
import CRUDMixin from './CRUDMixin';

export default {
  name: 'MyComponent',
  mixins: [CRUDMixin],
  data() {
    return {
      input: '',
    };
  },
};
</script>

In the above code, we introduce the CRUDMixin we just defined through the mixins attribute, and then the methods and data defined in this mixin can be used in the component. Here we use v-for in the MyComponent component template to iterate over the items array and provide options to add, delete and update data.

Summary

Using mixins can greatly improve the reusability and maintainability of code, especially in some repeated CRUD operations. In this article, we covered tips on how to use mixins to implement CRUD operations in Vue, including creating mixins and using mixins in components. Using these techniques, we can easily implement CRUD operations in Vue, avoiding the trouble of repeatedly writing lengthy code.

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