How to send mail for multiple models in rails - ruby-on-rails

Question

I am new to rails. I am having problem in mail sending to multiple models. Our project contains parent,teacher and student models.each module having number of users(student,parent,teacher). And also I am having three check box.that is student,teacher,parent.when I click student and teacher.the mail should be sent to all teachers and all students.
If I want send a mail to teacher and also student means ,the problem behind this, mail was sending only to teacher not student. how to solve this problem.and I included my coding.
Controller
def send_news_letter
if params[:announcement].present?
#announcement = Announcement.find(params[:announcement].keys).first
end
if params[:students].present? and params[:teachers].present?
#student = Student.pluck(:email)
#teacher = Teacher.pluck(:email)
UserMailer.send_multiple_email(#student,#teacher,#announcement).deliver
redirect_to announcements_url, :notice => "Newsletter Delivered Successfully" a
end
end
Usermailer.rb
class UserMailer < ActionMailer::Base
default to: Proc.new {Teacher.pluck(:email)},
to: Proc.new {Student.pluck(:email)},
from: "from#example.com"
# Subject can be set in your I18n file at config/locales/en.yml
# with the following lookup:
#
# en.user_mailer.password_reset.subject
#
def password_reset(user)
#user = user
mail :to => user.email, :subject => "Password Reset"
end
def send_multiple_email(user,employee,announcement)
#user = user
#employee = employee
#announcement = announcement
mail :subject => "Deliver"
end
end
Please help me.Thanks in advance.

Answer 1

First, in your controller I would store all addresses in one array:
#emails = []
if params[:students].present?
#emails += Student.pluck(:email)
end
if params[:teachers].present?
#emails += Teacher.pluck(:email)
end
if params[:parents].present?
#emails += Parent.pluck(:email)
end
UserMailer.send_multiple_email(#emails,#announcement).deliver
And then in your mailer change to this:
def send_multiple_email(emails,announcement)
#announcement = announcement
emails.each do | address |
mail :to => address, :subject => "Deliver"
end
end
Please note, that if you're referencing your models in the mailer template (such as "Hi <%= #user.name %>!") then you need to load the whole model object. Now you're just using pluck to get a list of all the addresses you want to send to. To get the whole model, change pluck(:email) to all in your controller and change your mailer to reference the attributes in that model instead. This also means your three models need to have the same attribute names (at least the ones you intend to use in the mailer).
Hope it makes sense.