[Vue warn]: Error in callback for watcher "function () { return this._data.$$state }": "Error: [vuex] Do not mutate vuex store state outside mutation handlers."

  • I use a List for rendering my todos, which are managed with vuex. Im not sure why i got this error.

     <q-list inset-separator>
            v-for="(todo, key, index) in todos"
              <q-checkbox color="secondary" v-model="todo.done" @change="changeTodo(todo.id)" />
            <q-item-main :label="todo.todo" />
            <q-item-side right icon="more_vert">
              <q-popover ref="popover">
                <q-list link>
                  <q-item @click="removeTodo(todo.id)">
                    <q-item-main label="Delete" />

    Here is my method which calls the vuex action:

     changeTodo (todo) {
       this.selectedTodo = this.todos[todo]

    Here i get the state:

     computed: {
          'todos': state => state.todos.todos

    Vuex and app works fine and also the state is updated but i got this error too.

  • The problem is in v-model=“todo.done”. What did i wrong?

  • I replaced




    Now it works fine. But when do i use/need v-model?

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