How sending emails to users authorised to view a post - polymorphic association Ruby-on-Rails

Question

Using polymorphic association, I was able to give specific users access to edit a particular post.

My model looks like this

User model

has_many :postuser
has_many :posts, through: :postuser

Post model

has_many :postuser
has_many :users, through: :postuser

post user

belongs_to :post
belongs_to :user

I want to send all users authorised to view a post whenever the post is updated.

In my model_mailer I have

class ModelMailer < ApplicationMailer
  def new_user_notification(post)
    @post = post
    mail to: @Post.postuser.user.email, subject: "Welcome User"
  end
end

but I am getting

undefined method `postuser' 

how do I send mails to only users related via postusers.

Answer 1

if you want to send email once a post is updated, you can simply do something like this.

def new_record_notification(post, current_user_email)
  @post = post
  @current_user_email = current_user_email  
  users_email = post.postusers.map{|post| post.user.email}.join(",")
  mail to: users_email, subject: "Your post has been updated"
end

and then you can have this in your update method in the post controller

ModelMailer.new_record_notification(@project, current_user.email).deliver_now