Tips for modifying a state array in Vuex

I have the ability to add and remove entries, but I'm struggling with editing. How can I achieve this using VUEJS, VUEX, and JavaScript?

For adding entries, I know I should use PUSH, and for removing entries, SPLICE works fine. But what about editing?

Below is an example of my current implementation:

<b-button type="submit" @click.prevent="submit()">SAVE</b-button>

methods: {      
  submit() {
    this.$v.edit_category.$touch();
    if(this.$v.edit_category.$error) return
    this.editCategory()
  },
  editCategory() {
    const category = {
      value: this.edit_category.value,
      text: this.edit_category.text,
      category_active: this.edit_category.category_active,
    }        
    
    this.$store.commit('saveCategory', category)
  },
},

In my store.js file:

actions: {
addCategory({ commit }, payload) {
  console.log(payload)
  commit('addCategory', payload) 
},
saveCategory({ commit }, payload) {
  console.log(payload)
  commit('saveCategory', payload) 
},
 deleteCategory({ commit }, payload) {
  console.log(payload)
  commit('deleteCategory', payload) 
}


mutations: {
addCategory(state, category) {   
  state.categories.push(category)      
},
saveCategory(state, payload) {
  state.categories.push(payload)
},
deleteCategory(state, category) {
  var index = state.categories.findIndex(c => c.value === category.value)
  state.categories.splice(index, 1)
},

Answer №1

Utilize Vue.set:

import Vue from 'vue';
// ...

editCategory(state, category) {
  var index = state.categories.findIndex(c => c.value === category.value);
  Vue.set(state.categories, index, category);  // ✅ Vue.set
},

This is essential because according to the information provided in the documentation:

Vue cannot recognize the following modifications made to an array:

When you directly assign a new value to an item using its index, for example, vm.items[indexOfItem] = newValue

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