Installing

Install axios and vuex-loopback.

yarn add axios vuex-loopback

or via npm

npm install axios vuex-loopback

Create Vuex module

1. Import axios and module factory.

import axios from 'axios';
import {createModule} from 'vuex-loopback';

2. Create axios instance with baseURL option.

const client = axios.create({
  baseURL: 'https://my-domain.com/api/',
});

3. Define collection model with default fields.

const model = {
  id: '',
  title: '',
  body: '',
}

4. Create Vuex module by the module factory.

Before use built-in components ItemsLoader and ItemEditor you need to create the Vuex module of Loopback collection which you want to manage. For example we will create a named module vlArticles of Articles collection.

new Vuex.Store({
  modules: {
    // ...
    vlArticles: {
      namespaced: true,
      ...createModule({
        client,                 // (required) Axios instance.
        model,                  // (required) Collection model.
        collection: 'Articles', // (required) Plural collection name.
        state: {},              // Extend default state.
        getters: {},            // Extend default getters.
        actions: {},            // Extend default actions.
        mutations: {},          // Extend default mutations.
      }),
    },
    // ...
  }
});

It's recommended to prefer vl prefix of a module name to mark module is created by vuex-loopback.

Vuex module usage

The following fields will contain data when you get, create or update a single item.

• item: object = null - Persisted item.
• tempItem: object = null - New or modified item.

And a state of a multiple items:

• items: object[] = [] - Fetched items.

It's a general part of module state.

Create item

In the previous step we provided the model with default fields to the module factory. An action CREATE_TEMP_ITEM will create a new item by this model automatically (only tempItem state, not in database).

store.dispatch(
  'vlArticles/CREATE_TEMP_ITEM',
  {title: 'My Article'},
);

The second argument is not required but you can patch data of new item.

State of tempItem now is:

{
  "id": "",
  "title": "My Article",
  "body": ""
}

By an action PUT_TEMP_ITEM the data of tempItem will be created or updated (if exists) in database.

await store.dispatch(
  'vlArticles/PUT_TEMP_ITEM',
);

During request a state of loading is true.

State of item and tempItem now is:

{
  "id": "5fd491fceea2be937cb838fc",
  "title": "My Article",
  "body": ""
}

After that, we have a new state of item which contains persisted data, but the tempItem has updated also (by a new id value). So if you will change the state of tempItem then you can check differences between persisted data item and modified tempItem, and discard changes by SET_TEMP_ITEM mutation to a previous value from item state.

Type of generated ID is depends to your database.

Fetch items

Create another one article.

store.dispatch(
  'vlArticles/CREATE_TEMP_ITEM',
  {title: 'Second Article'}
);

await store.dispatch(
  'vlArticles/PUT_TEMP_ITEM'
);

Dispatch an action FETCH_ITEMS to get an array in items state.

await store.dispatch(
  'vlArticles/FETCH_ITEMS',
);

Use a second argument to provide fetching options.

State of items is:

[
  {
    "id": "5fd491fceea2be937cb838fc",
    "title": "My Article",
    "body": ""
  },
  {
    "id": "5fd491fceea2be937cb838fb",
    "title": "Second Article",
    "body": ""
  }
]

The FETCH_ITEMS action will request an items by conditions defined in the state which you can set by mutations.

Fetch item by ID

An action FETCH_ITEM will update item and tempItem state by fetched data.

await store.dispatch(
  'vlArticles/FETCH_ITEM',
  {id: '5fd491fceea2be937cb838fc'},
);

State of item and tempItem now is:

{
  "id": "5fd491fceea2be937cb838fc",
  "title": "My Article",
  "body": ""
}

Update item

Before update a database, we need to modify the data of tempItem which was fetched in the previous step.

const {tempItem} = store
  .state
  .vlArticles;

store.commit('vlArticles/SET_TEMP_ITEM', {
  ...tempItem,
  body: 'Article body',
});

State of tempItem now has a new body value:

{
  "id": "5fd491fceea2be937cb838fc",
  "title": "My Article",
  "body": "Article body"
}

Commit changes by PUT_TEMP_ITEM action.

await store.dispatch(
  'vlArticles/PUT_TEMP_ITEM',
);

Now your database and item state has updated by modified tempItem.

Remove item

An action REMOVE_ITEM will remove an item from database.

await store.dispatch(
  'vlArticles/REMOVE_ITEM',
  '5fd491fceea2be937cb838fc',
);

The item will be removed from the state automatically.

Load items by Vue Component

Built-in component ItemsLoader will help you to load collection items right in Vue template. A scope of default slot has some usefull methods and properties to create items list with lazy-load or pagination behaviours.

Props

• module: string - Name of Vuex module.
• noAutoload: boolean - Do not autoload items after mount.

Scope of default slot

• items: object[] - Loaded items.
• loading: boolean - Loading state.
• page: number - Current page.
• pages: number - Total number of pages.
• hasMore: boolean - Can we load more?
• load() - Load items.
• loadPage(page: number) - Load specific page.
• loadMore() - Load more items.

* Component will load items automatically if prop noAutoload has not specified.
* All properties and methods of slot scope are accessible by component reference (ref attribute).

Basic example

1. Import ItemsLoader from vuex-loopback.

import {ItemsLoader} from 'vuex-loopback';

2. Define local component.

export default {
  // ...
  components: {
    ItemsLoader,
  },
  // ...
}

3. Use it to load collection items.

<!-- Loader -->
<items-loader
  module="vlArticles">

  <template
    slot-scope="{items, hasMore, loadMore}">
    
    <!-- Item -->
    <div
      :key="item.id"
      v-for="item in items">
      {{ item.title }}
    </div>
    
    <!-- More Button -->
    <button
      v-if="hasMore"
      @click="loadMore">
      More
    </button>
    
  </template>
  
</items-loader>

Manage an item by Vue Component

You are able to create, update or remove collection item by built-in component ItemEditor. Same as above ItemEditor has a scope of default slot which provides specific methods and properties.

Props

• module: string - Name of Vuex module.
• extend: object - Extend an item fields.

Scope of default slot

• item: object - Selected item.
• loading: boolean - Loading state.
• edit(item: object) - Select or create item if no argument specified.
• set(item: object) - Update selected or created item temporary.
• save() - Commit temporary changes applied by method set.
• remove() - Remove selected item from collection.

* All properties and methods of slot scope are accessible by component reference (ref attribute).

Basic example

1. Import ItemEditor from vuex-loopback.

import {ItemEditor} from 'vuex-loopback'; // new line
import {ItemsLoader} from 'vuex-loopback';

2. Define local component.

export default {
  // ...
  components: {
    ItemEditor, // new line
    ItemsLoader,
  },
  // ...
}

3. Use it to create editor form.

<!-- Editor -->
<item-editor
  ref="editor"
  module="vlArticles">
  
  <template
    slot-scope="{item, set, save, remove}">

    <form
      @submit.prevent="save">
      
      <!-- Title Field -->
      <input
        :value="item.title"
        @input="set({...item, title: $event})"/>

      <!-- Save Button -->
      <button
        type="submit">
        Save
      </button>

      <!-- Remove Button -->
      <button
        v-if="item.id"
        @click="remove">
        Remove
      </button>
  
    </form>
  
  </template>

</item-editor>

4. Update items loader template.

<!-- Loader -->
<items-loader
  module="vlArticles">

  <template
    slot-scope="{items, hasMore, loadMore}">
    
    <!-- Item -->
    <div
      :key="item.id"
      v-for="item in items">
      {{ item.title }}
      
      <!-- Edit Button -->
      <button
        @click="() => $refs.editor.edit(item)">
        Edit
      </button>
      
    </div>
    
    <!-- More Button -->
    <button
      v-if="hasMore"
      @click="loadMore">
      More
    </button>
    
    <!-- Create Button -->
    <button
      @click="() => $refs.editor.edit()">
      Create
    </button>
    
  </template>
  
</items-loader>

Module structure

You may want to use Vuex module directly.
Let's see what it has.

State

• item: object = null - Loaded item.
• tempItem: object = null - Clone of item.
• items: object[] = [] - Loaded items.
• skip: number = 0 - Items offset.
• limit: number = 20 - Items limit.
• total: number = 0 - Total items.
• orderBy: string = '' - Sort by field.
• orderDesc: boolean = '' - Sort descending.
• searchBy: string[] = ['name'] - Search by fields.
• searchQuery: string = '' - Searching query.
• where: object = {} - Fetching condition.
• loading: boolean = false - Loading state.
• include: string[] = [] - Fetching relations.
• fields: string[] = [] - Fetching fields.

Getters

• page: number - Number of current page.
• totalPages: number - Number of total pages.
• hasMore: boolean - Can we load more? (lazy loading)
• itemChanged: boolean - State of item and tempItem is not the same.

Mutations

• RESET
• SET_ITEM(value: object)
• RESET_ITEM
• SET_TEMP_ITEM(value: object)
• RESET_TEMP_ITEM
• SET_ITEMS(value: object[])
• RESET_ITEMS
• SET_SKIP(value: number)
• RESET_SKIP
• SET_LIMIT(value: number)
• RESET_LIMIT
• SET_TOTAL(value: number)
• RESET_TOTAL
• SET_ORDER_BY(value: string)
• RESET_ORDER_BY
• SET_ORDER_DESC(value: boolean)
• RESET_ORDER_DESC
• SET_SEARCH_BY(value: string[])
• RESET_SEARCH_BY
• SET_SEARCH_QUERY(value: string)
• RESET_SEARCH_QUERY
• SET_WHERE(value: object)
• RESET_WHERE
• SET_LOADING(value: boolean)
• RESET_LOADING
• SET_INCLUDE(value: string[])
• RESET_INCLUDE
• SET_FIELDS(value: string[])
• RESET_FIELDS
• UPDATE_ITEM(item: object)
• REMOVE_ITEM(id: number|string)

Actions:

• FETCH_ITEM(payload)

  • id: number|string
  • filter: object = {}
  • noTempItem: boolean = false

• FETCH_ITEMS(payload)

  • filter: object = {}
  • noGlobals: boolean = false
  • append: boolean = false

• CREATE_ITEM(payload)

  • data: object
  • filter: object = {}

• PATCH_ITEM(payload)

  • id: number|string
  • data: object
  • filter: object = {}

• REMOVE_ITEM(id: number|string)

• CREATE_TEMP_ITEM(item: object = null)

• PUT_TEMP_ITEM(payload)

  • filter: object = {}
  • noPatch: boolean = false
  • reset: boolean = false

• SEARCH_ITEMS(payload)

  • query: string = ''
  • searchBy: string[] = null

• FETCH_PAGE(payload)

  • page: number = 1

• FETCH_MORE()

Tests

1. Clone loopback-example-relations and start web-server.

git clone https://github.com/strongloop/loopback-example-relations.git
cd loopback-example-relations
yarn
yarn start

2. Clone vuex-loopback in a new terminal session and run the tests.

git clone https://github.com/mikeevstropov/vuex-loopback.git
cd vuex-loopback
yarn
yarn test

Examples

Vue CLI project vuex-loopback-example

Todo

• State factory.
• Mutations factory.
• Actions factory.
• Getters factory.
• Loader component.
• Editor component.
• Documentation.
• Examples.