Action mailer default_url_options
In Rails, default_url_options
is a method that allows you to set default options for URLs generated by the url_for
method. In the context of an Action Mailer, default_url_options
is used to set default options for the URLs used in the email templates.
Here's an example of how you might use default_url_options
in an Action Mailer:
class UserMailer < ApplicationMailer
default_url_options host: 'example.com', protocol: 'https'
end
In this example, the default_url_options
method is called on the UserMailer
class, and it sets the default host and protocol for URLs generated by the url_for
method. This means that any URLs generated by the mailer will have the host example.com
and the protocol https
.
You can also use default_url_options
to set default options for specific routes. For example:
class UserMailer < ApplicationMailer
default_url_options host: 'example.com', protocol: 'https', only_path: true
end
In this example, the only_path
option is set to true
, which means that URLs generated by the mailer will only include the path part of the URL, without the host or protocol.
You can also use default_url_options
to set default options for specific controllers. For example:
class UserMailer < ApplicationMailer
default_url_options controller: 'users', action: 'show'
end
In this example, the default_url_options
method is called on the UserMailer
class, and it sets the default controller and action for URLs generated by the mailer. This means that any URLs generated by the mailer will point to the show
action of the users
controller.
It's worth noting that default_url_options
is a class-level method, so it's called once when the mailer is initialized, and the options are stored as an instance variable. This means that you can't use default_url_options
to set options that depend on the instance of the mailer, such as the current user's ID. If you need to set options that depend on the instance of the mailer, you'll need to use a different approach, such as using a helper method or a instance variable.