mobase

Mobase.js: Firebase-MobX adapter (a no-painer)

Documentation: https://rasdaniil.gitbooks.io/mobase/content/

mobase helps you to create MobX-powered Firebase-syncronised reactive MobaseStores in a simple and intuitive manner.

It's based on a unidirectional data flow pattern. So the the only way to alternate data in the store is to write it to firebase. Because of the nature of Firebase changes will take effect immediately (don't have to wait until it syncs with the server)

MobaseStore has a MobX map as a collection of elements (items) at the core. It supports most of MobX maps' methods like values(), entries(), size, etc..

It's important that every item had it's own id (any unique field can be an id, see options.idField)

GETTING STARTED

npm install --save mobase

Let's say we expect to have our data in firebase structured as following:

/todos
      -KdqjbX-oyvjM7ftb43K
          id: "-KdqjbX-oyvjM7ftb43K"
          isDone: false
          subtasks
              0: "Subtask #1"
              1: "Subtask #2"
          text: "This is my first todo"
      -KdvJzu-bynbpyMa1fGl
      -KdvRsT9-FeN4vVEGTj0
      // and so on

There are a few expressive ways to define our store:

import {MobaseStore} from 'mobase'
 
// don't forget to firebase.initializeApp(credentials)
 
const todoStore = new MobaseStore({
     path: '/todos',
     database: firebase.database(),
     fields: {
         id: observable.ref,
         isDone: {
             modifier: observable.ref,
             default: ''
         },
         subtasks: {
             modifier: observable.shallow,
             default: []
         },
         text: observable.ref
     }
})
 

Now let's use the store created in a reactive manner with React.

import {observer} from 'mobx-react'
 
const App = observer( ({todoStore}) => {
 
    return (
        <main>
            <div>Total: {todoStore.size}</div>
 
            <ul>
                {todoStore.values().map( item => (
                    <li key={item.id}>
                        {item.text}
 
                        {item.subtasks.map( (subtask, i) => (
                            <div key={i}>{subtask}</div>
                        )}
                    </li>
                ))}
            </ul>
        </main>
    )
 
} )
 
ReactDOM.render(<App todoStore={todoStore} />, document.getElementById('app'));

To add data:

const addTodo = text => {
    todoStore
         .write({ text })
         .then( id => console.log('New item id: %s', id) )
}

To modify existing item:

const completeTodo = todo => {
    todoStore
        .update( {id: todo.id, isDone: true} ) // don't forget to specify id of the object being updated
        .then( id => console.log('Updated successfully, id: %s', id) )
}
 
 
const addSubtask = (todo, subtask) => {
    const subtasks = todo.subtasks.slice().concat( subtask ) //new subtasks array
 
    todoStore
        .update( {id: todo.id, subtasks } )
        .then( id => console.log('Updated successfully, id: %s', id) )
}
 
 
const todo = todoStore.values()[0] //getting the first todo from the store
completeTodo(todo)
addSubtask(todo, "Yet another subtask)

To remove an item:

 
const removeTodo = todo => {
    todoStore
         .delete(todo.id)
         .then( id => console.log('Deleted item %s', id) )
}