Refactor Rails controller - ruby

Question

I am trying to achieve this feature:
Sent texts out to new authors.
It enables admin users to
when authors published their first article in a specified timeframe, Compose and send out emails to authors
Download a CSV file with a list of recipients.
I want to refactor the controller code in efficient way
Models
class Email < ActiveRecord::Base
end
class User < ActiveRecord::Base
has_many :articles
scope :recent, -> { order("created_at DESC") }
end
class Article < ActiveRecord::Base
end
# Controller
class EmailsController < ApplicationController
attr_accessor :email
def new
#email = Email.new
if params[:date_from].present? && params[:date_to].present?
fetch_users
end
end
def create
#email = Email.new(email_params)
users = fetch_users
recipients = []
users.each do |user|
recipients << user.email
end
if #email.save && send_mail_to_user(recipients)
redirect_to emails_path, notice: "Emails Sent Successfully!"
end
end
def download_csv
users = fetch_users
send_data to_csv(users), filename: "users-article-#{Time.zone.today}.csv"
end
private
def to_csv(data)
inputs = %w{id email name}
CSV.generate(headers: true) do |csv|
csv << attributes
data.each do |user|
csv << inputs.map { |attr| user.send(attr) }
end
end
end
def send_mail_to_user(users)
users.each do |r|
UserMailer.bulk_email(r).deliver_later
end
end
def fetch_users
#users = User.recent.joins(:articles).group("articles.user_id").where("`published_article_count` = 1").
where("published_at Between ? AND ?", Date.parse(params[:date_from]), Date.parse(params[:date_to])).page(params[:page])
end
def email_params
params.permit(:body, :date_from, :date_to)
end
end