How to get multiple values of a record with map - ruby-on-rails

Question

In my application I can have multiple accounts and accounts can have multiple emails. I have a method that counts all the unique email from every account, but that is not what I want however.
Instead I want to return all the unique email from just one account NOT all, as the method is currently doing.
Here is my current method:
class AccountEmails
def self.count
accounts = Account.all
alert = accounts.map do |a|
a.users.first.alert_email.split(",")
end
billing = accounts.map do |a|
a.users.first.billing_email.split(",")
end
user = accounts.map do |a|
a.users.first.email.split(",")
end
snitch = accounts.map do |a|
a.snitches.map { |s| s.alert_email.split(",") }
end
[alert, billing, user, snitch].flatten.uniq.count
end
end
This will return all the email that are unique from all the accounts. I want to return all the unique email for each account, so account 1 could have four unique email and account 2 could have five unique email.

Answer 1

It sounds like you're saying you want a single method that gives you all the unique emails for each account. If I'm understanding you, I would do something like this:
class Account
def all_emails
# I'm assuming here that you actually only want the unique
# emails on the first user for each account
user = self.users.first
[
user.alert_email.split(","),
user.billing_email.split(","),
user.email.split(","),
self.snitches.map{|snitch| snitch.alert_email.split(",") }
].flatten
end
def unique_emails
all_emails.uniq
end
end
class AccountEmails
def self.unique
Account.all.includes(:snitches).map do |account|
account.uniq_emails
end
end
def self.count
uniq.flatten.count
end
end