Mandrill API not sending - ruby-on-rails

Question

I'm trying to set up the Mandrill API to send an email when a user clicks a button, but I cannot seem to get it to send. The email will send perfectly fine from the console, so I know it is not a problem with the template (Devise emails also send find).
I think it is to do with how I have set it up in the controller but I cannot find any help on where I should put it instead.
Here is the code from the controller:
def attending
#event = Event.find(params[:id])
type = params[:type]
if type == "attending" && #event.space != 0
current_user.attending << #event
#event.space = #event.space - 1
#event.save
AdminMailer.new_attending(#event.user, current_user)
redirect_to :back, notice: "You've joined the group. Your number will be sent to #{#event.user.name}"
else type == "unattending"
current_user.attending.delete(#event)
redirect_to :back, notice: "You've removed yourself from the group"
end
end
Here is the admin_mailer.rb
class AdminMailer < ActionMailer::Base
require 'mandrill'
def mandrill_client
#mandrill_client ||= Mandrill::API.new MANDRILL_API_KEY
end
def new_attending(creator, user)
template_name = "new-attending"
template_content = []
message = {
to: [{email: creator.email, name: creator.name}],
subject: "Someone wants to go riding with you!",
merge_vars: [
{rcpt: creator.email,
vars: [
{name: "CREATOR_NAME", content: creator.name},
{name: "USER_NAME", content: user.name},
{name: "USER_NUMBER", content: user.number}
]}
]
}
mandrill_client.messages.send_template template_name, template_content, message
end
end
And here is the link they click in the view.html.erb that should send the email:
<td><% if event.user != current_user && event.space != 0 && user_signed_in? %>
<% unless event.attendees.include?(current_user) %>
<%= link_to "Join", attending_event_path(event, type: "attending"), class: "btn btn-primary btn-xs", method: :put %>
<% end %>
<% end %></td>
Any help in figuring out why it's not sending would be great! As I said, it works in the console when I type:
AdminMailer.new_attending(#event, #user)

Answer 1

Please replace following code.
AdminMailer.new_attending(#event.user, current_user)
with
AdminMailer.new_attending(#event.user, current_user).deliver
I hope this will work.