How to clone all the repositories or projects from gitlab?

clone_gitlab_projects.rb

#!/usr/bin/env ruby
require 'rubygems'
require 'bundler/setup'

# TWO WAYS TO RUN THIS SCRIPT:
# ----------------------------
# --->>> THE FIRST WAY> Run this script as executable: `./clone_gitlab_projects.rb`
# You need to make the script executable: `chmod +x gitlab_clone_all_repos.rb`

# ---- ANYTHING ABOVE THIS LINE IS ONLY REQUIRED IF YOU WANT TO RUN THE SCRIPT WITH SINGLE COMMAND `./clone_gitlab_projects.rb` ---- #

# --->>> THE SECOND WAY> Run the script as regular ruby script: `ruby clone_gitlab_projects.rb` 
# You need to make sure that you have installed 'httparty' gem with: gem install httparty
# if not, check the top section for setup to run script as executable `./clone_gitlab_projects.rb`

# ABOUT THIS SCRIPT:
# ==================
# This script clones the repo from gitlab
# You can
  # either: run the script and enter values in run time (DEFAULT)
  # or: change values of: ORGN_API_URL & PRIVATE_TOKEN at the top first and update (comment/uncomment) part in: def self.url_with_token(resource_url)

# ******* SCRIPT BEGINS HERE ********
require 'httparty'

# # if you want to define constant
# ORGN_API_URL = 'https://gitlab.example.com/api/v3/'
# PRIVATE_TOKEN = 'QALWKQFAGZDWQYDGHADS' # as query string
# visit - https://gitlab.example.com/profile/account

class MyGitlab
  include HTTParty

  def self.get_all resource
    get(url_with_token(resource), verify: false).parsed_response
  end

  def self.url_with_token(resource_url)
    # ONE WAY
    # Enter values in runtime
    print "Enter organization url for gitlab: "
    orgn_api_url = gets.chomp
    print "Enter private token for gitlab: "
    private_token = gets.chomp
    url = URI.join(orgn_api_url, resource_url)
    "#{url}?private_token=#{private_token}"
    ###########################################
    # # ANOTHER WAY
    # # if you have defined constant
    # url = URI.join(ORGN_API_URL, resource_url)
    # "#{url}?private_token=#{PRIVATE_TOKEN}"
  end
end

def main
  projects = MyGitlab.get_all('projects')
  # keys just for useful reference
  # keys = ['name', 'description', 'ssh_url_to_repo', 'web_url', 'path_with_namespace']
  count = projects.count
  projects.each_with_index do |project, idx|
    puts "\n#{(100.0 * idx / count).round(2)}% done"
    puts "clonning project #{idx+1} of #{projects.count}..."
    `git clone #{project['ssh_url_to_repo']}`
  end
  puts "\n\nClonning complete.\n\n"

end

if __FILE__ == $0
  puts "Clones all the repo from gitlab"
  puts "You must have: organization url:\n\te.g. https://gitlab.example.com/api/v3/"
  puts "You must have: private token from your account (https://gitlab.example.com/profile/account):\n\te.g. QALWKQFAGZDWQYDGHADS"
  main
end

You just need to make the return string in line 36 to be the following:
"#{url}?private_token=#{PRIVATE_TOKEN}&per_page=100"