Nested each do loops printing unexpectedly in Ruby

Question

I have two arrays containing strings. I'm trying to iterate through both arrays with nested .each do loops to see if any elements in the first array have a substring of any of the elements in the second array. I'm using .include? within the nested loops to check this. I want the result to be the string printed the number of times it matches an element in partials.

This is the method that isn't working

def orphanCheck(partials, partials1, duplicatesArray)
  partials1.each do |i|
    partials.each do |j|
      if i.include?(j)
        duplicatesArray.push(i)
      end
    end
  end
end

I'm using this as a helper method to define partials and partials1

def manipulate(monthEmails, todayEmails, partials, partials1)
  monthEmails.each do |i|
    email = EmailAddress.new(i.to_s)
    partials.push(email.host_name.to_s)
  end
  todayEmails.each do |j|
    todaySignup = j.to_s.slice(11, 100)
    partials1.push(todaySignup)
  end
end 

And then I'm calling the two with the following

manipulate(allUnique, todayEmails, partials, partials1)

orphanCheck(partials, partials1, duplicatesArray)
#puts duplicatesArray

duplicatesArray is printing some strings that shouldn't be matches and it's printing some strings more times than I want. For example, gmail.com isn't in partials at all but [email protected], which is in partials1 once, is being pushed to duplicatesArray three times. If yahoo.com is in partials three times, then I would want [email protected] (from partials1) to be pushed to duplicatesArray three times, for example.

Answer 1

To be sure you could be doing:

  partials1.each do |i|
    i_ups=i.split('@')[-1]
    partials.each do |j|
      if i_ups===j
        duplicatesArray.push(i)
        break
      end
    end
  end

If I understood correctly (partials is only the host part of the email provider and partials1 is the full email address)