[Vuejs]-Computed property “eleron” was assigned to but it has no setter

You are mapping the getters from vuex. This means that you can only get the value from the store, you cannot write to it.

You need to also map a mutation.

Something like this should work, depending on the fact that you have a mutation defined on the store:

methods: {
 ...mapMutations([
  'updateEleron'
 ]),
}

And then call it in the promise callback

this.updateEleron(response.data)

Note: vuex offers read only access to variables from outside the store. Writing to a variable needs to be done from inside a mutation or action.