Nuxt await async + vuex - vue.js

Question

Im using nuxt and vuex. In vuex im getting data:
actions: {
get_posts(ctx) {
axios.get("http://vengdef.com/wp-json/wp/v2/posts").then(post => {
let posts = post.data;
if (!posts.length) return;
let medias_list = "";
posts.forEach(md => {
medias_list += md.featured_media + ","
});
medias_list = medias_list.slice(0, -1);
let author_list = "";
posts.forEach(md => {
author_list += md.author + ","
});
author_list = author_list.slice(0, -1);
axios.all([
axios.get("http://vengdef.com/wp-json/wp/v2/media?include=" + medias_list),
axios.get("http://vengdef.com/wp-json/wp/v2/users?include=" + author_list),
axios.get("http://vengdef.com/wp-json/wp/v2/categories"),
]).then(axios.spread((medias, authors, categories) => {
ctx.commit("set_postlist", {medias, authors, categories} );
})).catch((err) => {
console.log(err)
});
})
}
},
In vuex state i have dynamic postlist from exaple below.
How i can use it in Nuxt?
In nuxt i know async fetch and asyncData.
async fetch () {
this.$store.dispatch("posts/get_posts");
}
Thats not working.
How i can say to nuxt, wait loading page, before vuex actions loading all data?

Answer 1

As you already mentioned there are:
fetch hook
asyncData
And differences are well described here
The reason why your code is not working might be in your store action.
It should return a promise, try to add return before axios get method ->
get_posts(ctx) {
return axios.get(...
// ...
And then, on your page:
async fetch () {
await this.$store.dispatch("posts/get_posts");
}
Also, in comment above you're saying that you dont want to commit data in store:
...load page only after vuex, i dont need to pass data in vuex
But you do it with this line:
ctx.commit("set_postlist", {medias, authors, categories} );
if you dont want to keep data in store, just replace line above with:
return Promise.resolve({ medias, authors, categories })
and get it on your page:
async fetch () {
this.posts = await this.$store.dispatch("posts/get_posts");
// now you can use posts in template
}

Answer 2

Misread the actual question, hence the update
With Nuxt, you can either use asyncData(), the syntax will change a bit tho and the render will be totally blocked until all the calls are done.
Or use a combo of fetch() and some skeletons to make a smooth transition (aka not blocking the render), or a loader with the $fetchState.pending helper.
More info can be found here: https://nuxtjs.org/docs/2.x/features/data-fetching#the-fetch-hook
Older (irrelevant) answer
If you want to pass a param to your Vuex action, you can call it like this
async fetch () {
await this.$store.dispatch('posts/get_posts', variableHere)
}
In Vuex, access it like
get_posts(ctx, variableHere) {
That you can then use down below.
PS: try to use async/await everywhere.
PS2: also, you can destructure the context directly with something like this
get_posts({ commit }, variableHere) {
...
commit('set_postlist', {medias, authors, categories})
}