Today I will try to put down some basic changes that ActionMailer got with Rails 3.
Using a mailer model and a view, ActionMailer allows you to send emails from Rails application. Mailers get inherited from base class of ActionMailer i.e ActionMailer::Base and views reside with controller views.
Generating a mailer is simple.
$rails g mailer ReportMailer
In Rails 3, a default attributes can be easily specified:
class ReportMailer < ActionMailer::Base layout 'mylayout' # use mylayout.(html|text).erb as the layout default :from => "from@gauravsblog.com", :reply_to => "replyto@gauravsblog.com" end
Adding a method like the one below will send an email on Report creation.
class ReportMailer < ActionMailer::Base default :from => "reporter@gauravsblog.com" def registration_email(report) @user = report.user @site_url = "http://gauravssite.com/login" mail(:to => report.user.email, :subject => "Welcome to Gauravs Site") end end
app/views/report_mailer should contain a corresponding view with name registration_email.html.erb which would act as a template.
The code for the email template is pretty trivial:
<html> <head> <meta content="text/html; charset=UTF-8" http-equiv="Content-Type" /> </head> <body> Welcome to Gauravs site Username for login: <%= @user.login %> Login here: <%= @site_url %> Thanks. </body> </html>
Try to also keep the text format with the name registration_email.text.erb.
Lets say you created a report and you wanted to send an email to the user of the report, you could do something like this in the controller.
class ReportController < ApplicationController def create if @report.save ReportMailer.registration_email(@report).deliver end end end
ActionMailer methods:
* headers – specify email header
* attachments – for attaching emails
* mail – sends the actual email
Set values in this way:
mail("X-Spam" => value)
Passing hash key value pairs to header
headers {"X-Spam" => value, "X-Special" => another_value}
Attachments can be easily added and the mime type gets automatically identified.
attachments['myfile.jpg'] = File.read('/path/to/myfile.jpg')
Inline attachment beocmes trivial:
attachments.inline['myimage.jpg'] = File.read('/path/to/myimage.jpg')
Use this in the email template
<%= image_tag attachments['myimage.jpg'].url %>
Here is the ActionMailer configuration that goes in config/environment.rb or config/env/desired_env.rb
config.action_mailer.perform_deliveries = true config.action_mailer.raise_delivery_errors = true
Using SMTP (GMail)
config.action_mailer.delivery_method = :smtp
config.action_mailer.smtp_settings = {
:address => "smtp.gmail.com",
:port => 587,
:domain => 'mydomain.com',
:user_name => '<username>',
:password => '<password>',
:authentication => 'plain',
:enable_starttls_auto => true
}
Thats all for now about mailer stuff ..
If you are getting
“hostname was not match with the server certificate” in your Rails 3 app, the crucial line is the :enable_starttls_auto => false.
You might encounter this if you have been running on Ruby 1.8.6 for a while and decided to move to 1.8.7 at the same time you transition to Rails 3 from Rails 2.*
Hi,
I am trying to use Devise with Rails 3 and ruby 1.8.7.
I’ve set the confirmable option so that users get a confirmation email when they register.
However, I keep getting this error “undefined method ‘encode!’ for Confirmation:String” when I try to register a user.
Can you please help me out with this?
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