How to set the ActionMailer default_url_options's :host dynamically to the request's hostname?

Question

I am trying to set the :host for action mailer default url options.

I have the below set in all the environment files

config.action_mailer.default_url_options = {   :host => "localhost" } 

I want to make it more dynamic by providing the request host.

when I try to set it by

config.action_mailer.default_url_options = {   :host => request.domain } 

OR

config.action_mailer.default_url_options = {   :host => request.env["SERVER_NAME"] } 

It throws error... doesn't recognize "request" object

is there any way I can set this to the request host, not by hardcoding...?

Answer 1

It is also possible to set a default host that will be used in all mailers by setting the :host option in the default_url_options hash

in an application_controller.rb add:

class ApplicationController < ActionController::Base   def default_url_options     { host: request.host_with_port }   end end 

Source: https://edgeguides.rubyonrails.org/action_controller_overview.html#default-url-options

Alternatively, you can pass the request when calling the mailer function from the controller

class UserMailer < ActionMailer::Base    def welcome_email(user, request)     @user = user     @url  = user_url(@user, host: request.host_with_port ) # do this for each link     mail(:to => user.email, :subject => "Welcome to My Awesome Site")   end end 

Source : https://guides.rubyonrails.org/action_mailer_basics.html#generating-urls-with-named-routes