AbstractController
Sending mail from a controller involves three steps:
Set mail settings in merb_init.rb (Not shown here…see the Mailer docs).
Create a MailController subclass with actions and templates.
Call the MailController from another Controller via the send_mail method.
First, create a file in app/mailers that subclasses Merb::MailController. The actions in this controller will do nothing but render mail.
# app/mailers/article_mailer.rb class ArticleMailer < Merb::MailController def notify @user = params[:user] render_mail end end
You also can access the params hash for values passed with the Controller.send_mail method. See also the documentation for render_mail to see all the ways it can be called.
Create a template in a subdirectory of app/mailers/views that corresponds to the controller and action name. Put plain text and ERB tags here:
# app/mailers/views/article_mailer/notify.text.erb Hey, <%= @user.name %>, We're running a sale on dog bones!
Finally, call the Controller.send_mail method from a standard Merb controller.
class Articles < Application def index @user = User.find_by_name('louie') send_mail(ArticleMailer, :notify, { :from => "me@example.com", :to => "louie@example.com", :subject => "Sale on Dog Bones!" }, { :user => @user }) render end end
Note: If you don’t pass a fourth argument to Controller.send_mail, the controller’s params will be sent to the MailController subclass as params. However, you can explicitly send a hash of objects that will populate the params hash instead. In either case, you must set instance variables in the MailController’s actions if you want to use them in the MailController’s views.
The MailController class is very powerful. You can:
Send multipart email with a single call to render_mail.
Attach files.
Render layouts and other templates.
Use any template engine supported by Merb.
A convenience method that creates a blank copy of the MailController and runs dispatch_and_deliver on it.
method<~to_s> |
The method name to dispatch to. |
mail_params<Hash> |
Parameters to send to MailFactory. |
send_params<Hash> |
Configuration parameters for the MailController. |
# File lib/merb-mailer/mail_controller.rb, line 337 def self.dispatch_and_deliver(method, mail_params, send_params = {}) new(send_params).dispatch_and_deliver method, mail_params end
Sets the template root to the default mailer view directory.
klass<Class> |
The Merb::MailController inheriting from the base class. |
# File lib/merb-mailer/mail_controller.rb, line 130 def self.inherited(klass) super klass._template_root = Merb.dir_for(:mailer) / "views" unless self._template_root end
params<Hash> |
Configuration parameters for the MailController. |
controller<Merb::Controller> |
The base controller. |
# File lib/merb-mailer/mail_controller.rb, line 115 def initialize(params = {}, controller = nil) @params = params @base_controller = controller super end
Classes that inherit from Merb::MailController. |
# File lib/merb-mailer/mail_controller.rb, line 79 def self.subclasses_list() _subclasses end
The location to look for a template and mime-type. This is overridden from AbstractController, which defines a version of this that does not involve mime-types.
template<String> |
The absolute path to a template - without mime and template extension. The mime-type extension is optional - it will be appended from the current content type if it hasn’t been added already. |
type<~to_s> |
The mime-type of the template that will be rendered. Defaults to nil. |
@public
# File lib/merb-mailer/mail_controller.rb, line 108 def _absolute_template_location(template, type) template.match(/\.#{type.to_s.escape_regexp}$/) ? template : "#{template}.#{type}" end
action<~to_s> |
The name of the action that will be rendered. |
type<~to_s> |
The mime-type of the template that will be rendered. Defaults to nil. |
controller<~to_s> |
The name of the controller that will be rendered. Defaults to controller_name. |
String |
The template location, i.e. “:controller/:action.:type”. |
# File lib/merb-mailer/mail_controller.rb, line 91 def _template_location(action, type = nil, controller = controller_name) "#{controller}/#{action}.#{type}" end
Mimic the behavior of absolute_url in AbstractController but use @base_controller.request
# File lib/merb-mailer/mail_controller.rb, line 264 def absolute_url(name, *args) return base_controller.absolute_url(name, *args) if base_controller super end
Attaches a file or multiple files to an email. You call this from a method in your MailController (including a before filter).
file_or_files<File, Array> |
File(s) to attach. |
filename<String> |
|
type<~to_s> |
The attachment MIME type. If left out, it will be determined from file_or_files. |
headers<String, Array> |
Additional attachment headers. |
attach File.open("foo") attach [File.open("foo"), File.open("bar")]
If you are passing an array of files, you should use an array of the allowed parameters:
attach [[File.open("foo"), "bar", "text/html"], [File.open("baz"), "bat", "text/css"] which would attach two files ("foo" and "baz" in the filesystem) as
“bar” and “bat” respectively. It would also set the mime-type as “text/html” and “text/css” respectively.
# File lib/merb-mailer/mail_controller.rb, line 293 def attach( file_or_files, filename = file_or_files.is_a?(File) ? File.basename(file_or_files.path) : nil, type = nil, headers = nil) @mailer.attach(file_or_files, filename, type, headers) end
method<~to_s> |
The method name to dispatch to. |
mail_params<Hash> |
Parameters to send to MailFactory (see below). |
MailFactory recognizes the following parameters:
:to
:from
:replyto
:subject
:body
:cc
Other parameters passed in will be interpreted as email headers, with underscores converted to dashes.
# File lib/merb-mailer/mail_controller.rb, line 313 def dispatch_and_deliver(method, mail_params) @mailer = self.class._mailer_klass.new(mail_params) @mail = @mailer.mail @method = method # dispatch and render use params[:action], so set it self.action_name = method body = _dispatch method if !@mail.html.blank? || !@mail.text.blank? @mailer.deliver! Merb.logger.info "#{method} sent to #{@mail.to} about #{@mail.subject}" else Merb.logger.info "#{method} was not sent because nothing was rendered for it" end end
Override filters halted to return nothing.
# File lib/merb-mailer/mail_controller.rb, line 136 def filters_halted end
Allows you to render various types of things into the text and HTML parts of an email If you include just text, the email will be sent as plain-text. If you include HTML, the email will be sent as a multi-part email.
options<~to_s, Hash> |
Options for rendering the email or an action name. See examples below for usage. |
There are a lot of ways to use render_mail, but it works similarly to the default Merb render method.
First of all, you’ll need to store email files in your app/mailers/views directory. They should be under a directory that matches the name of your mailer (e.g. TestMailer’s views would be stored under test_mailer).
The files themselves should be named action_name.mime_type.extension. For example, an erb template that should be the HTML part of the email, and rendered from the “foo” action would be named foo.html.erb.
The only mime-types currently supported are “html” and “text”, which correspond to text/html and text/plain respectively. All template systems supported by your app are available to MailController, and the extensions are the same as they are throughout the rest of Merb.
render_mail can take any of the following option patterns:
render_mail
will attempt to render the current action. If the current action is “foo”, this is identical to render_mail :foo.
render_mail :foo
checks for foo.html.ext and foo.text.ext and applies them as appropriate.
render_mail :action => {:html => :foo, :text => :bar}
checks for foo.html.ext and bar.text.ext in the view directory of the current controller and adds them to the mail object if found
render_mail :template => {:html => "foo/bar", :text => "foo/baz"}
checks for bar.html.ext and baz.text.ext in the foo directory and adds them to the mail object if found.
render_mail :html => :foo, :text => :bar
the same as render_mail :action => {html => :foo, :text => :bar }
render_mail :html => "FOO", :text => "BAR"
adds the text “FOO” as the html part of the email and the text “BAR” as the text part of the email. The difference between the last two examples is that symbols represent actions to render, while string represent the literal text to render. Note that you can use regular render methods instead of literal strings here, like:
render_mail :html => render(:action => :foo)
but you’re probably better off just using render_mail :action at that point.
You can also mix and match:
render_mail :action => {:html => :foo}, :text => "BAR"
which would be identical to:
render_mail :html => :foo, :text => "BAR"
# File lib/merb-mailer/mail_controller.rb, line 212 def render_mail(options = @method) @_missing_templates = false # used to make sure that at least one template was found # If the options are not a hash, normalize to an action hash options = {:action => {:html => options, :text => options}} if !options.is_a?(Hash) # Take care of the options opts_hash = {} opts = options.dup actions = opts.delete(:action) if opts[:action].is_a?(Hash) templates = opts.delete(:template) if opts[:template].is_a?(Hash) # Prepare the options hash for each format # We need to delete anything relating to the other format here # before we try to render the template. [:html, :text].each do |fmt| opts_hash[fmt] = opts.delete(fmt) opts_hash[fmt] ||= actions[fmt] if actions && actions[fmt] opts_hash[:template] = templates[fmt] if templates && templates[fmt] end # Send the result to the mailer { :html => "rawhtml=", :text => "text="}.each do |fmt,meth| begin local_opts = opts.merge(:format => fmt) local_opts.merge!(:layout => false) if opts_hash[fmt].is_a?(String) clear_content value = render opts_hash[fmt], local_opts @mail.send(meth,value) unless value.nil? || value.empty? rescue Merb::ControllerExceptions::TemplateNotFound => e # An error should be logged if no template is found instead of an error raised if @_missing_templates Merb.logger.error(e.message) else @_missing_templates = true end end end @mail end
# File lib/merb-mailer/mail_controller.rb, line 121 def session self.base_controller.request.session rescue {} end
Mimic the behavior of absolute_url in AbstractController but use @base_controller.request
# File lib/merb-mailer/mail_controller.rb, line 255 def url(name, *args) return base_controller.url(name, *args) if base_controller super end
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