Add ability to export most recent 500 first iterations

Author: iHiD

Gemfile

@@ -33,6 +33,7 @@ gem "bugsnag"
 gem 'aws-sdk-s3'
 gem 'image_processing', '~> 1.2'
 gem 'rest-client'
+gem 'rubyzip', require: false
 
 gem 'bootsnap', '>= 1.1.0', require: false
 

Gemfile.lock

@@ -434,6 +434,7 @@ DEPENDENCIES
   rails (~> 5.2)
   rails-controller-testing
   rest-client
+  rubyzip
   rugged
   sass-rails (~> 5.0)
   selenium-webdriver

app/controllers/admin/data/exercises_controller.rb

@@ -0,0 +1,12 @@
+class Admin::Data::ExercisesController < AdminController
+  def show
+    @track = Track.find(params[:track_id])
+    @exercise = @track.exercises.find(params[:id])
+
+    @solutions = @exercise.solutions.submitted.order('id DESC').limit(500)
+
+    zip_path = ExportSolutionsData.(@solutions)
+    send_file(zip_path)
+  end
+end
+

app/controllers/admin/data/tracks_controller.rb

@@ -0,0 +1,10 @@
+class Admin::Data::TracksController < AdminController
+  def index
+    @tracks = Track.order('title ASC')
+  end
+
+  def show
+    @track = Track.find(params[:id])
+    @exercises = @track.exercises.reorder('slug ASC')
+  end
+end

app/services/export_solutions_data.rb

@@ -0,0 +1,27 @@
+require 'zip'
+
+class ExportSolutionsData
+  include Mandate
+
+  initialize_with :solutions
+
+  def call
+    dir = Rails.root / "tmp" / "export_solutions_data" / "#{Time.now.to_i}-#{SecureRandom.uuid}"
+    FileUtils.mkdir_p(dir)
+
+    solutions.includes(iterations: :files).each.with_index do |solution, idx|
+      solution_dir = dir / idx.to_s
+      FileUtils.mkdir(solution_dir)
+
+      solution.iterations.first.files.each do |iteration_file|
+        File.open(solution_dir / iteration_file.filename, "w+") do |file|
+          file << iteration_file.file_contents
+        end
+      end
+    end
+
+    (dir / "archive.zip").tap do |zip_path|
+      ZipDirectoryRecursively.(dir, zip_path)
+    end
+  end
+end

app/services/zip_directory_recursively.rb

@@ -0,0 +1,54 @@
+require 'zip'
+
+# This is a simple example which uses rubyzip to
+# recursively generate a zip file from the contents of
+# a specified directory. The directory itself is not
+# included in the archive, rather just its contents.
+#
+# Usage:
+#   directory_to_zip = "/tmp/input"
+#   output_file = "/tmp/out.zip"
+#   zf = ZipFileGenerator.new(directory_to_zip, output_file)
+#   zf.write()
+class ZipDirectoryRecursively
+  include Mandate
+
+  initialize_with :input_dir, :output_file
+
+  def call
+    entries = Dir.entries(input_dir) - %w(. ..)
+
+    ::Zip::File.open(output_file, ::Zip::File::CREATE) do |zipfile|
+      write_entries entries, '', zipfile
+    end
+  end
+
+  private
+
+  # A helper method to make the recursion work.
+  def write_entries(entries, path, zipfile)
+    entries.each do |e|
+      zipfile_path = path == '' ? e : File.join(path, e)
+      disk_file_path = File.join(input_dir, zipfile_path)
+      puts "Deflating #{disk_file_path}"
+
+      if File.directory? disk_file_path
+        recursively_deflate_directory(disk_file_path, zipfile, zipfile_path)
+      else
+        put_into_archive(disk_file_path, zipfile, zipfile_path)
+      end
+    end
+  end
+
+  def recursively_deflate_directory(disk_file_path, zipfile, zipfile_path)
+    zipfile.mkdir zipfile_path
+    subdir = Dir.entries(disk_file_path) - %w(. ..)
+    write_entries subdir, zipfile_path, zipfile
+  end
+
+  def put_into_archive(disk_file_path, zipfile, zipfile_path)
+    zipfile.get_output_stream(zipfile_path) do |f|
+      f.write(File.open(disk_file_path, 'rb').read)
+    end
+  end
+end

app/views/admin/data/tracks/index.html.haml

@@ -0,0 +1,5 @@
+.lo-container
+  %h1 Tracks
+  %ul
+    -@tracks.each do |track|
+      %li= link_to track.title, [:admin, :data, track]

app/views/admin/data/tracks/show.html.haml

@@ -0,0 +1,6 @@
+.lo-container
+  %h1= @track.title
+
+  %ul
+    -@exercises.each do |exercise|
+      %li= link_to exercise.title, [:admin, :data, @track, exercise]

config/routes.rb

@@ -35,6 +35,11 @@
       resources :iterations, only: [:show]
     end
     resources :mentors, only: [:index]
+    namespace :data do
+      resources :tracks, only: [:index, :show] do
+        resources :exercises, only: [:show]
+      end
+    end
   end
 
   # ###### #