Cloud Firestore Quickstart

Introduction

Fire Eats is a restaurant recommendation app built on Cloud Firestore alongside Android Architecture Component.

After reading about the new Android Architecture Component's guide to architect your app. I converted the orignal sample presented by firebase to use the component with respect due architecture recommendation in the guide.

For more information about Firestore visit the docs. For more information about Android Architecture Components visit the docs.

Getting Started

• Set up your Android app for Cloud Firestore
  • Use the package name com.google.firebase.example.fireeats
• In the Authentication tab of the Firebase console go to the Sign-in Method page and enable 'Email/Password'.
  • This app uses FirebaseUI for authentication.
• Run the app on an Android device or emulator.

Security Rules

Add the following security rules to your project in the: rules tab:

service cloud.firestore {  
  match /databases/{database}/documents {
    // Anyone can read a restaurant, only authorized
    // users can create, update, or delete them.
  	 match /restaurants/{restaurantId} {
    	 allow read: if true;
    	 allow create, update, delete: if request.auth.uid != null;
    }
    
    // Anyone can read a rating. Only the user who made the rating
    // can delete it. Ratings can never be updated.
    match /restaurants/{restaurantId}/ratings/{ratingId} {
    	 allow read: if true;
      allow create: if request.auth.uid != null;
    	 allow delete: if request.resource.data.userId == request.auth.uid;
    	 allow update: if false;
    }
  }
}

Run the App

• When you open the app you will be prompted to sign in, choose any email and password.
• When you first open the app it will be empty, choose Add Random Items from the overflow menu to add some new entries.

Result

Indexes

As you use the app's filter functionality you may see warnings in logcat that look like this:

com.google.firebase.example.fireeats W/Firestore Adapter: onEvent:error
com.google.firebase.firestore.FirebaseFirestoreException: FAILED_PRECONDITION: The query requires an index. You can create it here: https://console.firebase.google.com/project/...

This is because indexes are required for most compound queries in Cloud Firestore. Clicking on the link from the error message will automatically open the index creation UI in the Firebase console with the correct paramters filled in:

This app also provides an index specification file in indexes.json which specifies all indexes required to run the application. You can add all of these indexes programatically using the Firebase CLI.