Step16 Create User in Firestore

Goal of this step

• Create user data in firestore.

Why?

Why do we need to create firestore user? Is firebase authentication user not enough?

1. Firebase auth stores information only about authentication.
2. We want to store data like name, updatedAt etc...
3. We want to store relationship with User and Post in firestore in a later step.

Install Firestore package

https://pub.dev/packages/cloud_firestore

*NOTE! Please use this or above version. => Important new feature collectionGroup added.

cloud_firestore: ^0.13.0+1

Make firestore database

Visit: https://console.firebase.google.com

And make firestore database in "test mode".

Add Firestore code

lib/pages/register_page.dart

onPressed: () async {

if (_registerFormKey.currentState.validate()) {

try {

// Register user by firebase auth

final FirebaseUser user = (await FirebaseAuth.instance

.createUserWithEmailAndPassword(

email: _emailController.text,

password: _passwordController.text

)).user;

/* store users data in firestore database */

await Firestore.instance

.collection("users")

.document(user.uid)

.setData({

"name": _nameController.text,

"email": _emailController.text,

"createdAt": FieldValue.serverTimestamp(), // https://stackoverflow.com/questions/50907151/flutter-firestore-server-side-timestamp

"updatedAt": FieldValue.serverTimestamp()

});

Navigator.pushNamed(context, '/');

} catch (e) {

print('Error Happened!!!: $e');

}

}

},

Check the meaning of code

Let's first check the official example code. https://pub.dev/packages/cloud_firestore#usage

This is a code to make a new book.

Firestore.instance.collection('books').document()

.setData({ 'title': 'title', 'author': 'author' });

If you don't set document() id blank, firestore automatically create documentID for you.

But, in our example, I set the user documentID equal to the Firebase Auth user id.

By doing this, It will be easy to fetch information related to the current logged-in user.

Firestore.instance

.collection("users")

.document(user.uid)

.setData({

"name": _nameController.text,

"email": _emailController.text,

"createdAt": FieldValue.serverTimestamp(), // https://stackoverflow.com/questions/50907151/flutter-firestore-server-side-timestamp

"updatedAt": FieldValue.serverTimestamp()

});

Test it.

Please register new test user from Flutter App.

Then, Check it in console: https://console.firebase.google.com

Memo of Error in this step

debug console

Error Happened!!!: MissingPluginException(No implementation found for method DocumentReference#setData on channel plugins.flutter.io/cloud_firestore)

=> flutter clean https://github.com/flutter/flutter/issues/13971

d8 error: https://github.com/flutter/flutter/issues/20747