Vue/Vuex - Module two relies on module one, which in turn fetches data from the server

Question

Vue/Vuex - Module two relies on module one, which in turn fetches data from the server

Take a look at this:

import accountModule from '@/store/modules/account/account';
import otherModule from '@/store/modules/other/other';

export default new Vuex.Store({
  modules: {
    account: accountModule,
    other: otherModule,
  }
});

The initialization of data in the other module is dependent on the account module due to user-specific settings. For instance, other.state.list relies on account.state.settings.listOrder. However, I need the data for the account module to be retrieved from the server, which involves an asynchronous process. Therefore, when setting up other, it cannot directly reference account.state.settings.listOrder as the server response might not have been received yet.

I attempted to export a promise in the accountModule that resolves with the module itself, but this approach did not work as expected.

import accountModulePromise from '@/store/modules/account/account';

accountModulePromise.then(function (accountMoudle) {
  import otherModule from '@/store/modules/other/other';

  ...
});

However, I encountered an error stating that import statements must be top-level.

A different method that was unsuccessful involved using await like so:

let accountModule = await import('@/store/modules/account/account');
import otherModule from '@/store/modules/other/other';
...

This resulted in an error indicating that await is a reserved word. This is confusing because according to https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/import, this should be a valid operation.

javascript asynchronous vue.js vuex

Answer 1

Answer №1

Your previous code block failed to work because the await keyword must be contained within an async function.

Remember, you can only use the await keyword inside async functions. If you attempt to use it outside of an async function, a SyntaxError will occur.

Referenced from MDN.

You might want to explore Dynamic Module Registration:

accountModulePromise.then(async () => {
  let otherModule = await import('@/store/modules/other/other');
  store.registerModule('other', otherModule.default);
});

However, when attempting to access state or dispatch actions, you'll need to ensure that the module is registered, which can become cumbersome.

In my opinion, it could be beneficial to restructure your module organization for better decoupling. Consider moving your initialization logic to main.js or App.vue, and then dispatch actions from there to update module states.

Updates

Building on your recent updates regarding decoupling your store, one approach could involve storing your list without any specific order, sorting it dynamically when needed. This can be achieved using:

Computed property:

...
computed: {
  list () {
    let list = this.$store.state.other.list
    let order = this.$store.state.account.settings.listOrder
    if (!list || !order) return []
    return someSort(list, order)
  }
},

beforeCreate () {
  this.$store.dispatch('other/fetchList')
  this.$store.dispatch('account/fetchListOrder')
}
...

Or Vuex getters:

...
getters: {
  list: (state) => (order) => {
    return someSort(state.list, order)
  }
}
...

...
computed: {
  list () {
    let order = this.$store.state.account.settings.listOrder
    return this.$store.getters['others/list'](order)
  }
}
...

Answer 2

Your previous code block failed to work because the await keyword must be contained within an async function.

Remember, you can only use the await keyword inside async functions. If you attempt to use it outside of an async function, a SyntaxError will occur.

Referenced from MDN.

You might want to explore Dynamic Module Registration:

accountModulePromise.then(async () => {
  let otherModule = await import('@/store/modules/other/other');
  store.registerModule('other', otherModule.default);
});

However, when attempting to access state or dispatch actions, you'll need to ensure that the module is registered, which can become cumbersome.

In my opinion, it could be beneficial to restructure your module organization for better decoupling. Consider moving your initialization logic to main.js or App.vue, and then dispatch actions from there to update module states.

Updates

Building on your recent updates regarding decoupling your store, one approach could involve storing your list without any specific order, sorting it dynamically when needed. This can be achieved using:

Computed property:

...
computed: {
  list () {
    let list = this.$store.state.other.list
    let order = this.$store.state.account.settings.listOrder
    if (!list || !order) return []
    return someSort(list, order)
  }
},

beforeCreate () {
  this.$store.dispatch('other/fetchList')
  this.$store.dispatch('account/fetchListOrder')
}
...

Or Vuex getters:

...
getters: {
  list: (state) => (order) => {
    return someSort(state.list, order)
  }
}
...

...
computed: {
  list () {
    let order = this.$store.state.account.settings.listOrder
    return this.$store.getters['others/list'](order)
  }
}
...

Answer 3

Answer №2

Let's say you have two modules - one with state retrieved from the server and another whose state relies on the first module, right?

Here's a potential solution:

Start by initializing your modules with empty 'state'. Then, in the accountModule, create an action to set up the state fetched from the server. Use a getter on other to sort the list accordingly. Lastly, trigger your action during app initialization.

const account = {
    namespaced: true,
    state: {
        listOrder: ''
    },
    mutations: {
        setListOrder (state, newListOrder) {
            state.listOrder = newListOrder
        }
    },
    actions: {
        async fetchServerState (ctx) {
            let result = await fetch("/path/to/server")
            ctx.commit('setListOrder', result.listOrder) 
            // This is just an example; adjust based on your response
        }
    }
}

const other = {
    namespaced: true,
    state: {
        unorderedList: []
    },
    getters: {
        list (state, getters, rootState) {
            return someSort(state.unorderedList, rootState.account.listOrder);
        }
    }
}

In App.vue (or similar):

created () {
    this.$store.dispatch('account/fetchServerState')
}

Answer 4

Let's say you have two modules - one with state retrieved from the server and another whose state relies on the first module, right?

Here's a potential solution:

Start by initializing your modules with empty 'state'. Then, in the accountModule, create an action to set up the state fetched from the server. Use a getter on other to sort the list accordingly. Lastly, trigger your action during app initialization.

const account = {
    namespaced: true,
    state: {
        listOrder: ''
    },
    mutations: {
        setListOrder (state, newListOrder) {
            state.listOrder = newListOrder
        }
    },
    actions: {
        async fetchServerState (ctx) {
            let result = await fetch("/path/to/server")
            ctx.commit('setListOrder', result.listOrder) 
            // This is just an example; adjust based on your response
        }
    }
}

const other = {
    namespaced: true,
    state: {
        unorderedList: []
    },
    getters: {
        list (state, getters, rootState) {
            return someSort(state.unorderedList, rootState.account.listOrder);
        }
    }
}

In App.vue (or similar):

created () {
    this.$store.dispatch('account/fetchServerState')
}

Vue/Vuex - Module two relies on module one, which in turn fetches data from the server

Answer №1

Answer №2

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