Getter undefined vuex and axios - vue.js

Question

I’m trying to get a getter in my component but it says an error. This is my code store.js
const store = new Vuex.Store({
state: {
config:{
themes: [],
typographies:[],
},
user: {
typography_id: 1,
theme_id: null
}
},
mutations: {
FETCH_CONFIG(state, config) {
state.config.themes = config.themes;
state.config.typographies = config.typographies;
},
FETCH_USER(state, user) {
state.user.theme_id = user.theme_id;
state.user.typography_id = user.typography_id;
},
},
actions: {
fetchConfig({commit}) {
axios.get('/api/config').then( function( response ){
commit('FETCH_CONFIG', response.data);
});
},
fetchUser({commit}) {
axios.get('/api/user').then( function( response ){
commit('FETCH_USER', response.data.data[0]);
});
},
},
getters: {
themes(state) {
return state.config.themes;
},
typographies(state) {
return state.config.typographies;
},
typography(state) {
if (state.user.theme_id == 1) {
return state.user.typography_id;
} else {
var theme = state.config.themes.filter(function (el) {
return el.id == state.user.theme_id;
});
return theme[0].typography_id;
}
},
user_theme(state) {
return state.user.theme_id;
},
}
});
And in my component in computed I have:
...mapGetters(['typographies', 'typography'])
And ths is the error I get:
I guess I’m doing something wrong but I don’t know what.

Answer 1

Your getter for typography returns the error because first it goes into the else and then tries to return theme[0].typography_id - but there is an empty array.. if you are loading the date, later on, make sure that the getter returns null before data is loaded.. like:
const store = new Vuex.Store({
state: {
config:{
themes: [],
typographies:[],
},
user: {
typography_id: 1,
theme_id: null
}
},
mutations: {
FETCH_CONFIG(state, config) {
state.config.themes = config.themes;
state.config.typographies = config.typographies;
},
FETCH_USER(state, user) {
state.user.theme_id = user.theme_id;
state.user.typography_id = user.typography_id;
},
},
actions: {
fetchConfig({commit}) {
axios.get('/api/config').then( function( response ){
commit('FETCH_CONFIG', response.data);
});
},
fetchUser({commit}) {
axios.get('/api/user').then( function( response ){
commit('FETCH_USER', response.data.data[0]);
});
},
},
getters: {
themes(state) {
return state.config.themes;
},
typographies(state) {
return state.config.typographies;
},
typography(state) {
if (state.user.theme_id == 1) {
return state.user.typography_id;
} else {
var theme = state.config.themes.filter(function (el) {
return el.id == state.user.theme_id;
});
return theme.length > 0 ? theme[0].typography_id: 1;
}
},
user_theme(state) {
return state.user.theme_id;
},
}
});