rake task and action_mailer.default_url_options

Question

When I try to use ActionMailer from rake task I'm getting this error:

ActionView::Template::Error: Missing host to link to! Please provide the :host parameter, set default_url_options[:host] , or set :only_path to true

In my development.rb I have the following line:

config.action_mailer.default_url_options = { :host => 'localhost:3000' }

Moreover, if I put in development.rb this:

config.action_mailer.default_url_options[:host] = 'localhost:3000'

rake task works fine, but server crashes with this:

config/environments/development.rb:20:in block in ': undefined method []=' for nil:NilClass (NoMethodError)

If I do this:

config.action_mailer.default_url_options = {}
config.action_mailer.default_url_options[:host] = 'localhost:3000

rake task doesn't work again.

I'm confused, any suggestions?

UPD i don't think that code will help, but here it is, it's that simple:

rake task:

 task :send_newsletter => :environment do
    Receiver.all.each { |receiver|
      NewsletterMailer.newsletter(receiver).deliver
    }
  end

mailer:

  def newsletter(receiver)
    @receiver = receiver

    mail(to: receiver.email, subject: "newsletter") do |format|
          format.html 
    end
  end

and the view with some link_to xxx_url lines, apparently which causing the error

ruby version 2.4.1

rails 5.1.3

rake 12.0.0 (but also tried 12.3.0 with no difference)

Answer 1

Try the following, that should work

config.action_mailer.default_url_options = { host: 'localhost', port: 3000 }

Update

I don't know what is the ideal solution for this? but I have tested and it working for me

Rails.application.routes.default_url_options = config.action_mailer.default_url_options = { host: 'localhost', port: 3000 }

This also work

Rails.application.routes.default_url_options = Rails.application.config.action_mailer.default_url_options

This solution based on this link

And another one is

Rails.application.routes.default_url_options[:host] = '???'

This goes in each environment file - development.rb , test.rb and production.rb (and more if you have them) with the corresponding hostname in each one

Based Link

Hope it will help

Answer 2

solved with this line added to rake task. based on fool-dev's answer

Rails.application.routes.default_url_options = Rails.application.config.action_mailer.default_url_options