Devise Invitable optional custom message - devise

Question

I would like to add an optional text_field to add an optional message to the invitation email. So if nothing put into the message then the standard message from invitation_instructions.html.erb should be send otherwise the message of the text_field.
How to do this in devise?

Answer 1

To accomplish this you can use your own mailer instead of having devise email things for you.
Here is how to do it:
class User < ActiveRecord::Base
attr_reader :raw_invitation_token
end
class InvitationsController < Devise::InvitationsController
def create
#from = params[:from]
#subject = params[:invite_subject]
#content = params[:invite_content]
#user = User.invite!(params[:user], current_user) do |u|
u.skip_invitation = true
end
#user.deliver_invitation
email = NotificationMailer.invite_message(#user, #from, #subject, #content)
end
end
class NotificationMailer < ActionMailer::Base
def invite_message(user, venue, from, subject, content)
#user = user
#token = user.raw_invitation_token
invitation_link = accept_user_invitation_url(:invitation_token => #token)
mail(:from => from, :bcc => from, :to => #user.email, :subject => subject) do |format|
content = content.gsub '{{first_name}}', user.first_name
content = content.gsub '{{last_name}}', user.first_name
content = content.gsub '{{full_name}}', user.full_name
content = content.gsub('{{invitation_link}}', invitation_link)
format.text do
render :text => content
end
end
end
end
The raw_invitation_token only exists in newer versions of devise_invitable (compatible with devise >= 3.1).
We are essentially skipping the devise invitation process all together and using our own mailer. We take the content as a parameter and send it as the body of the email. We even substitute placeholders with their actual values.
This solution will give you a lot of flexibility to whatever you want with emails. You can even add a tracking pixel to it if you would like.