Troubleshooting: Unable to mutate a state variable in Vuex

I am working on updating my contact list whenever a different brand is selected. The goal is to clear the array of contacts associated with the current brand and then refill it with the new brand's contacts.

However, I'm facing an issue in my Vuex setup where the clearing of the array doesn't seem to work as expected. Is there anyone who can help me figure out why?

Below is my Store file:

export default {
    state: {
        brands: Array(), //Could potentially be used later, if not, remove.
        brandsForDropdown: Array(),
        brandContactsForDropdown: Array(),
    },
    getters: {
      brands: state => {
        return state.brands;
      },
      brandsForDropdown: state => {
        return state.brandsForDropdown
      },
      brandContactsForDropdown: state => {
        return state.brandContactsForDropdown
      }
    },
    actions: {
        getBrands({state, commit}) {
            Vue.http.get(process.env.VUE_APP_API_SERVER + '/brands').then(response => {
                if(response.body.length > 0) {
                    for (var i = 0; i < response.body.length; i++) { 
                        commit('pushBrands', {"name" : response.body[i].name, "value" : response.body[i].id})
                    }
                }
              }, response => {
                // error callback
              });
        },
        getBrandContacts({state, commit}, payload) {
            //commit('resetBrandContacts')
            Vue.http.get(process.env.VUE_APP_API_SERVER + '/brands/contacts/' + payload.value).then(response => {
                if(response.body.length > 0) {
                    let newArray = [];
                    for (var i = 0; i < response.body.length; i++) { 
                        newArray.push({"name" : response.body[i].firstname + " " + response.body[i].surname, "value" : response.body[i].id})
                    }
                    commit('pushBrandContact', newArray)
                }
              }, response => {
                // error callback
              });
        }
    },
    mutations: {
        pushBrands(state, payload) {
            state.brandsForDropdown.push(payload)
        },
        resetBrands(state) {
            state.brandsForDropdown = []
        },
        resetBrandContacts(state) {
            state.brandContactsForDropdown = []
        },
        pushBrandContact(state, payload) {
            console.log(payload)
            state.brandContactsForDropdown = payload
            console.log(state.brandContactsForDropdown)
        }
    }
}

Here is the complete component code:

<script>
export default {
  data () {
    return {
      productName: null,
      productBrand: null,
      brands: this.$store.getters.brandsForDropdown,
      selectedBrand: null,
      brandContacts: this.$store.getters.brandContactsForDropdown,
      selectedContacts: null,
    }
  },
  computed: {
  },
  watch: {
      selectedBrand: function() {
          if(this.selectedBrand != null) {
              this.$store.dispatch('getBrandContacts', this.selectedBrand)
              //this.brandContacts = this.$store.getters.brandContactsForDropdown
          }
          console.log(this.brandContacts);
      }
  },
  methods: {
  },
  mounted: function() {
  this.$store.dispatch('getBrands')
  }
}
</script>

This wraps up my entire Vuex module.

Answer №1

It seems like you may have encountered one of the common pitfalls mentioned in this article about Vue.js Gotchas:

If you are experiencing issues with updating an array and it not being detected, consider replacing the array instead of simply adding to it:

getBrandContacts({state, commit}, payload) {
  Vue.http.get(process.env.VUE_APP_API_SERVER + '/brands/contacts/' + 
               payload.value).then(response => {
    if(response.body.length > 0) {
      let newArray = []
      for (var i = 0; i < response.body.length; i++) { 
        newArray.push({"name" : 
                       response.body[i].firstname + " " + response.body[i].surname, "value" : 
                       response.body[i].id})
      }
      commit('pushBrandContact', newArray)
    }
  }, response => {
    // error callback
  });
}

Regarding mutations:

pushBrandContact(state, payload) {
  state.brandContactsForDropdown = payload
}

It's important to clarify how you are handling the data within the component - is it stored as data or computed properties? Providing this context will assist in finding a solution. You mentioned that the array doesn't clear - do you mean it retains old values in the Vuex state or within your component? Additional details would be helpful for troubleshooting.

Update:

If your data properties are only updated during initialization of the component or when manually updating them (this.data = newData), they may not reflect changes from Vuex updates.

To ensure synchronization with Vuex updates, move

brandContacts: this.$store.getters.brandContactsForDropdown
from the data object to the computed object like so:
brandContacts(){ this.$store.state.brandContactsForDropdown }

This adjustment prompts Vue to update when the brandContactsForDropdown property in Vuex undergoes changes.

https://v2.vuejs.org/v2/guide/computed.html

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