111 lines
3.3 KiB
Markdown
111 lines
3.3 KiB
Markdown
---
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date: 2021-02-07T19:26:34+02:00
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title: "Notifications"
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toc: true
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draft: false
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menu:
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sidebar:
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parent: "development"
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---
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# Notifications
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Vikunjs provides a simple abstraction to send notifications per mail and in the database.
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{{< table_of_contents >}}
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## Definition
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Each notification has to implement this interface:
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```golang
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type Notification interface {
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ToMail() *Mail
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ToDB() interface{}
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}
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```
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Both functions return the formatted messages for mail and database.
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A notification will only be sent or recorded for those of the two methods which don't return `nil`.
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For example, if your notification should not be recorded in the database but only sent out per mail, it is enough to let the `ToDB` function return `nil`.
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### Mail notifications
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A list of chainable functions is available to compose a mail:
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```golang
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mail := NewMail().
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// The optional sender of the mail message.
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From("test@example.com").
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// The optional receipient of the mail message. Uses the mail address of the notifiable if omitted.
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To("test@otherdomain.com").
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// The subject of the mail to send.
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Subject("Testmail").
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// The greeting, or "intro" line of the mail.
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Greeting("Hi there,").
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// A line of text
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Line("This is a line of text").
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// An action can contain a title and a url. It gets rendered as a big button in the mail.
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// Note that you can have only one action per mail.
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// All lines added before an action will appearr in the mail before the button, all lines
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// added afterwards will appear after it.
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Action("The Action", "https://example.com").
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// Another line of text.
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Line("This should be an outro line").
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```
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If not provided, the `from` field of the mail contains the value configured in [`mailer.fromemail`](https://vikunja.io/docs/config-options/#fromemail).
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### Database notifications
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All data returned from the `ToDB()` method is serialized to json and saved into the database, along with the id of the notifiable and a time stamp.
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## Creating a new notification
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The easiest way to generate a mail is by using the `mage dev:make-notification` command.
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It takes the name of the notification and the package where the notification will be created.
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## Notifiables
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Notifiables can receive a notification.
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A notifiable is defined with this interface:
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```golang
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type Notifiable interface {
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// Should return the email address this notifiable has.
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RouteForMail() string
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// Should return the id of the notifiable entity
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RouteForDB() int64
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}
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```
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The `User` type from the `user` package implements this interface.
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## Sending a notification
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Sending a notification is done with the `Notify` method from the `notifications` package.
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It takes a notifiable and a notification as input.
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For example, the email confirm notification when a new user registers is sent like this:
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```golang
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n := &EmailConfirmNotification{
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User: update.User,
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IsNew: false,
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}
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err = notifications.Notify(update.User, n)
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return
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```
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## Testing
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The `mail` package provides a `Fake()` method which you should call in the `MainTest` functions of your package.
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If it was called, no mails are being sent and you can instead assert they have been sent with the `AssertSent` method.
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## Example
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Take a look at the [pkg/user/notifications.go](https://code.vikunja.io/api/src/branch/master/pkg/user/notifications.go) file for a good example.
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