Vue.js computed property not working
I don't believe that a computed property in Vue.js can accept an argument, they are supposed to be able to build themselves without additional interaction. I believe that your fault was that you wrote a method and then tried to register it as a computed property.
So it should be a simple fix to just change the registration of your function from computed to methods which it really is.
methods: { fullName: function (user) { return user.first_name + ' ' + user.last_name; } }This way you will not have to change any of your other code.
Try to disable cache on the computed property, like mentioned in https://github.com/vuejs/vue/issues/1189. Doing this, the computed value will be always recalculated.
computed: { fullName: { cache: false, get() { return user.first_name + ' ' + user.last_name; } }}
Computed properties don't support nesting like that.
Proof and some workarounds/alternative solutions: https://github.com/vuejs/vue/issues/66