added the ability to customize the path for new files when implementing an exercise

app/controllers/exercises_controller.rb

@@ -26,6 +26,17 @@ class ExercisesController < ApplicationController
     end
   end
 
+  def collect_paths(files)
+    unique_paths = files.map(&:path).reject(&:blank?).uniq
+    subpaths = unique_paths.map do |path|
+      (path.split('/').length + 1).times.map do |n|
+        path.split('/').shift(n).join('/')
+      end
+    end
+    subpaths.flatten.uniq
+  end
+  private :collect_paths
+
   def create
     @exercise = Exercise.new(exercise_params)
     authorize!
@@ -62,6 +73,7 @@ class ExercisesController < ApplicationController
   def implement
     @submission = Submission.where(exercise_id: @exercise.id, user_id: current_user.id).order('created_at DESC').first
     @files = (@submission ? @submission.collect_files : @exercise.files).select(&:visible).sort_by(&:name_with_extension)
+    @paths = collect_paths(@files)
   end
 
   def index

app/views/code_ocean/files/_form.html.slim

@@ -2,6 +2,9 @@
   .form-group
     = f.label(:name, t('activerecord.attributes.file.name'))
     = f.text_field(:name, class: 'form-control', required: true)
+  .form-group
+    = f.label(:path, t('activerecord.attributes.file.path'))
+    = f.select(:path, @paths, {}, class: 'form-control')
   .form-group
     = f.label(:file_type_id, t('activerecord.attributes.file.file_type_id'))
     = f.collection_select(:file_type_id, FileType.where(binary: false).order(:name), :id, :name, {}, class: 'form-control')

spec/views/exercises/implement.html.slim_spec.rb

@@ -8,6 +8,7 @@ describe 'exercises/implement.html.slim' do
   before(:each) do
     assign(:exercise, exercise)
     assign(:files, files)
+    assign(:paths, [])
     render
   end