Database, browser, realtime ActionCable, Email, SMS, Slack notifications, and more for Rails apps

gem install noticed -v 1.2.9



๐ŸŽ‰ Notifications for your Ruby on Rails app.

Build Status

Currently, we support these notification delivery methods out of the box:

  • Database
  • Email
  • ActionCable channels
  • Twilio (SMS)
  • Vonage / Nexmo (SMS)

And you can easily add new notification types for any other delivery methods.

๐Ÿš€ Installation

Run the following command to add Noticed to your Gemfile

bundle add "noticed"

To save notifications to your database, use the following command to generate a Notification model.

rails generate noticed:model

This will generate a Notification model and instructions for associating User models with the notifications table.

๐Ÿ“ Usage

To generate a notification object, simply run:

rails generate noticed:notification CommentNotification

Notification Objects

Notifications inherit from Noticed::Base. This provides all their functionality and allows them to be delivered.

To add delivery methods, simply include the module for the delivery methods you would like to use.

class CommentNotification < Noticed::Base
  deliver_by :database
  deliver_by :action_cable
  deliver_by :email, if: :email_notifications?

  def email_notifications?

  # I18n helpers
  def message

  # URL helpers are accessible in notifications
  def url

  after_deliver do
    # Anything you want

Sending Notifications

To send a notification to a user:

notification = CommentNotification.with(comment: @comment.to_gid)

# Deliver notification in background job

# Deliver notification immediately

This will instantiate a new notification with the comment stored in the notification's params.

Each delivery method is able to transform this metadata that's best for the format. For example, the database may simply store the comment so it can be linked when rendering in the navbar. The websocket mechanism may transform this into a browser notification or insert it into the navbar.

Shared Options

  • if: :method_name - Calls method_nameand cancels delivery method if false is returned
  • unless: :method_name - Calls method_nameand cancels delivery method if true is returned
Helper Methods

You can define helper methods inside your Notification object to make it easier to render.

URL Helpers

Rails url helpers are included in notification classes by default so you have full access to them just like you would in your controllers and views.


Like ActiveRecord, notifications have several different types of callbacks.

class CommentNotification < Noticed::Base
  deliver_by :database
  deliver_by :email

  # Callbacks for the entire delivery
  before_deliver :whatever
  around_deliver :whatever
  after_deliver :whatever

  # Callbacks for each delivery method
  before_database :whatever
  around_database :whatever
  after_database :whatever

  before_email :whatever
  around_email :whatever
  after_email :whatever

When using deliver_later callbacks will be run around queuing the delivery method jobs (not inside the jobs as they actually execute).

Defining custom delivery methods allows you to add callbacks that run inside the background job as each individual delivery is executed. See the Custom Delivery Methods section for more information.


We've added translate and t helpers like Rails has to provide an easy way of scoping translations. If the key starts with a period, it will automatically scope the key under notifications and the underscored name of the notification class it is used in.

For example:

t(".message") looks up en.notifications.new_comment.message

User Preferences

You can use the if: and unless: options on your delivery methods to check the user's preferences and skip processing if they have disabled that type of notification.

For example:

class CommentNotification < Noticed::Base
  deliver_by :email, if: :email_notifications?

  def email_notifications?

๐Ÿš› Delivery Methods

The delivery methods are designed to be modular so you can customize the way each type gets delivered.

For example, emails will require a subject, body, and email address while an SMS requires a phone number and simple message. You can define the formats for each of these in your Notification and the delivery method will handle the processing of it.


Writes notification to the database.

deliver_by :database

Note: Database notifications are special in that they will run before the other delivery methods. We do this so you can reference the database record ID in other delivery methods.

  • association - Optional

    The name of the database association to use. Defaults to :notifications


Sends an email notification. Emails will always be sent with deliver_later

deliver_by :email, mailer: "UserMailer"

  • mailer - Required

    The mailer that should send the email

  • method: :invoice_paid - Optional

    Used to customize the method on the mailer that is called


Sends a notification to the browser via websockets (ActionCable channel by default).

deliver_by :action_cable

  • format: :format_for_action_cable - Optional

    Use a custom method to define the Hash sent through ActionCable

  • channel - Optional

    Override the ActionCable channel used to send notifications.

    Defaults to Noticed::NotificationChannel


Sends a Slack notification via webhook.

deliver_by :slack

  • format: :format_for_slack - Optional

    Use a custom method to define the payload sent to Slack. Method should return a Hash.

  • url: :url_for_slack - Optional

    Use a custom method to retrieve the Slack Webhook URL. Method should return a String.

    Defaults to Rails.application.credentials.slack[:notification_url]

Twilio SMS

Sends an SMS notification via Twilio.

deliver_by :twilio

  • credentials: :get_twilio_credentials - Optional

    Use a custom method to retrieve the credentials for Twilio. Method should return a Hash with :account_sid, :auth_token and :phone_ number keys.

    Defaults to Rails.application.credentials.twilio[:account_sid] and Rails.application.credentials.twilio[:auth_token]

  • url: :get_twilio_url - Optional

    Use a custom method to retrieve the Twilio URL. Method should return the Twilio API url as a string.

    Defaults to "{twilio_credentials(recipient)[:account_sid]}/Messages.json"

  • format: :format_for_twilio - Optional

    Use a custom method to define the payload sent to Twilio. Method should return a Hash.

    Defaults to:

      Body: notification.params[:message],
      From: twilio_credentials[:number],
      To: recipient.phone_number

Vonage SMS

Sends an SMS notification vai Vonage / Nexmo.

deliver_by :vonage

  • credentials: :get_credentials - Optional

    Use a custom method for retrieving credentials. Method should return a Hash with :api_key and :api_secret keys.

    Defaults to Rails.application.credentials.vonage[:api_key] and Rails.application.credentials.vonage[:api_secret]

  • deliver_by :vonage, format: :format_for_vonage - Optional

    Use a custom method to generate the params sent to Vonage. Method should return a Hash. Defaults to:

      api_key: vonage_credentials[:api_key],
      api_secret: vonage_credentials[:api_secret],
      from: notification.params[:from],
      text: notification.params[:body],
      to: notification.params[:to],
      type: "unicode"

๐Ÿšš Custom Delivery Methods

You can define a custom delivery method easily by adding a deliver_by line with a unique name and class option. The class will be instantiated and should inherit from Noticed::DeliveryMethods::Base.

class MyNotification < Noticed::Base
  deliver_by :discord, class: "DiscordNotification"
class DiscordNotification < Noticed::DeliveryMethods::Base
  def deliver
    # Logic for sending a Discord notification

Delivery methods have access to the following methods and attributes:

  • notification - The instance of the Notification. You can call methods on the notification to let the user easily override formatting and other functionality of the delivery method.
  • options - Any configuration options on the deliver_by line.
  • recipient - The object who should receive the notification. This is typically a User, Account, or other ActiveRecord model.
  • params - The params passed into the notification. This is details about the event that happened. For example, a user commenting on a post would have params of { user: User.first }


Callbacks for delivery methods wrap the actual delivery of the notification. You can use before_deliver, around_deliver and after_deliver in your custom delivery methods.

class DiscordNotification < Noticed::DeliveryMethods::Base
  after_deliver do
    # Do whatever you want


Rails 6.1+ can serialize Class and Module objects as arguments to ActiveJob. The following syntax should work for Rails 6.1+:

  deliver_by DiscordNotification

For Rails 6.0 and earlier, you must pass strings of the class names in the deliver_by options.

  deliver_by :discord, class: "DiscordNotification"

We recommend the Rails 6.0 compatible options to prevent confusion.

๐Ÿ™ Contributing

This project uses Standard for formatting Ruby code. Please make sure to run standardrb before submitting pull requests.

๐Ÿ“ License

The gem is available as open source under the terms of the MIT License.