firestore-livedata

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firestore-livedata

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LiveData extension functions for FireStore realtime Snapshots

// repository documentation

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# Firestore LiveData

## What's this?

Set of Kotlin extension functions used to convert realtime updates from Firebase Firestore collections/documents into LiveData objects (Android Architecture Components).

## Download

Gradle:

```groovy
allprojects {
    repositories {
        ...
        maven { url 'https://jitpack.io' }
    }
}

dependencies {

implementation 'com.github.brotoo25:firestore-livedata:0.0.9'
}
```

## How to use

```java
data class User(val name: String?, val email: String?)
 
FirebaseFirestore
        .getInstance()
        .collection("users")
        .livedata()
        .observe(this, Observer<QueryStatus<QuerySnapshot>> {
            Log.d("MainActivity", "${it?.answer?.size()}")
        })
```

## Parsing results

When passing the return class type to the 'livedata' function the default **DocumentSnapshot.toObject()** is called in order to parse the final result.
 <br><br>
 In case of the default document parser not working for your use case there is also the option to pass a parser function as an argument to handle the mapping behaviour.

```java
FirebaseFirestore
        .getInstance()
        .collection("users")
        .livedata(User::class.java)
        .observe(this, Observer<QueryStatus<List<User>>> {
            Log.d("MainActivity", "${it?.answer?.size}")
        })

FirebaseFirestore
        .getInstance()
        .collection("users")
        .livedata { parseUser(it) }
        .observe(this, Observer<QueryStatus<List<User>>> {
            Log.d("MainActivity", "${it?.answer?.size}")
        })

private fun parseUser(documentSnapshot: DocumentSnapshot) : User {
    return User(name = documentSnapshot.getString("name"), email = documentSnapshot.getString("email"))
}
 ```

#### Functions available for FireStore - Collections, Documents and Queries.

## Next steps

* Create sample app
 * Documentation

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