Add support for sendgrid template engine.

lib/sendgrid.rb

@@ -10,7 +10,8 @@ module SendGrid
     :subscriptiontrack,
     :footer,
     :spamcheck,
-    :bypass_list_management
+    :bypass_list_management,
+    :templates
   ]
 
   VALID_GANALYTICS_OPTIONS = [
@@ -67,7 +68,7 @@ def sendgrid_enable(*options)
       self.default_sg_options = Array.new unless self.default_sg_options
       options.each { |option| self.default_sg_options << option if VALID_OPTIONS.include?(option) }
     end
-    
+
     # Sets the default text for subscription tracking (must be enabled).
     # There are two options:
     # 1. Add an unsubscribe link at the bottom of the email
@@ -98,6 +99,11 @@ def sendgrid_unique_args(unique_args = {})
     end
   end
 
+  # Call within mailer method to set the template_id.
+  def sendgrid_template_id(template_id)
+    @sg_template_id = template_id
+  end
+
   # Call within mailer method to override the default value.
   def sendgrid_category(category)
     @sg_category = category
@@ -299,6 +305,11 @@ def filters_hash_from_options(enabled_opts, disabled_opts)
               filters[:ganalytics]['settings'][key.to_s] = value
             end
           end
+
+        when :templates
+          if @sg_template_id
+            filters[:templates]['settings']['template_id'] = @sg_template_id
+          end
       end
     end
 

sendgrid.gemspec

@@ -45,7 +45,6 @@ Gem::Specification.new do |s|
       s.add_development_dependency(%q<shoulda>, [">= 0"])
       s.add_development_dependency(%q<bundler>, ["~> 1.0.0"])
       s.add_development_dependency(%q<jeweler>, ["~> 1.5.1"])
-      s.add_runtime_dependency(%q<json>, [">= 0"])
     else
       s.add_dependency(%q<json>, [">= 0"])
       s.add_dependency(%q<shoulda>, [">= 0"])

test/sendgrid_test.rb

@@ -39,4 +39,28 @@ def setup
     actual = JSON.parse(mail.header['X-SMTPAPI'].value)
     assert_equal(expected, actual)
   end
+
+  should "something something sendgrid templates" do
+
+    sendgrid_template_uuid = "sendgrid-template-uuid"
+    @options[:sendgrid_template_id] = sendgrid_template_uuid
+    @options.delete(:substitutions)
+
+    test_email = SendgridTemplateMailer.create_test(@options).deliver
+
+    assert_equal(test_email.header["sendgrid-template-id"].value, sendgrid_template_uuid)
+    expected_filters = {
+      "templates" => {
+        "settings" => {
+          "enable" => 1,
+          "template_id" => "sendgrid-template-uuid"
+        }
+      }
+    }
+    filters = JSON.parse(test_email.header["X-SMTPAPI"].value)["filters"]
+    assert_equal(expected_filters, filters)
+
+  end
+
+
 end

test/test_helper.rb

@@ -46,6 +46,32 @@ def handle_sendgrid_options(options)
   end
 end
 
+class SendgridTemplateMailer < ActionMailer::Base
+  include SendGrid
+
+  def create_test(options)
+    handle_sendgrid_options(options)
+    mail(options)
+  end
+
+  protected
+  def handle_sendgrid_options(options)
+    if options[:sendgrid_template_id]
+      sendgrid_enable :templates
+      sendgrid_template_id options[:sendgrid_template_id]
+    end
+
+    if options[:substitutions]
+      options[:substitutions].each do |find, replace|
+        sendgrid_substitute(find, replace)
+      end
+    end
+
+    sendgrid_recipients  options[:to]
+    sendgrid_category(options[:category])
+  end
+end
+
 class SendgridUniqueArgsMailer < ActionMailer::Base
   include SendGrid
   sendgrid_unique_args({ :test_arg => "test value" })