merge master

.travis.yml

@@ -38,6 +38,8 @@ before_install:
 
 install:
   - bundle install --jobs=3 --retry=3 --deployment --path=${BUNDLE_PATH:-vendor/bundle}
+  - nvm install stable
+  - nvm use stable
   - yarn install
 
 before_script:

Gemfile

@@ -17,7 +17,7 @@ gem 'pg'
 gem 'pry-byebug'
 gem 'puma'
 gem 'pundit'
-gem 'rails', '5.2.3'
+gem 'rails', '5.2.4'
 gem 'rails-i18n'
 gem 'i18n-js'
 gem 'ransack'

Gemfile.lock

@@ -22,43 +22,43 @@ GEM
   remote: https://rubygems.org/
   specs:
     ZenTest (4.12.0)
-    actioncable (5.2.3)
-      actionpack (= 5.2.3)
+    actioncable (5.2.4)
+      actionpack (= 5.2.4)
       nio4r (~> 2.0)
       websocket-driver (>= 0.6.1)
-    actionmailer (5.2.3)
-      actionpack (= 5.2.3)
-      actionview (= 5.2.3)
-      activejob (= 5.2.3)
+    actionmailer (5.2.4)
+      actionpack (= 5.2.4)
+      actionview (= 5.2.4)
+      activejob (= 5.2.4)
       mail (~> 2.5, >= 2.5.4)
       rails-dom-testing (~> 2.0)
-    actionpack (5.2.3)
-      actionview (= 5.2.3)
-      activesupport (= 5.2.3)
+    actionpack (5.2.4)
+      actionview (= 5.2.4)
+      activesupport (= 5.2.4)
       rack (~> 2.0)
       rack-test (>= 0.6.3)
       rails-dom-testing (~> 2.0)
       rails-html-sanitizer (~> 1.0, >= 1.0.2)
-    actionview (5.2.3)
-      activesupport (= 5.2.3)
+    actionview (5.2.4)
+      activesupport (= 5.2.4)
       builder (~> 3.1)
       erubi (~> 1.4)
       rails-dom-testing (~> 2.0)
       rails-html-sanitizer (~> 1.0, >= 1.0.3)
-    activejob (5.2.3)
-      activesupport (= 5.2.3)
+    activejob (5.2.4)
+      activesupport (= 5.2.4)
       globalid (>= 0.3.6)
-    activemodel (5.2.3)
-      activesupport (= 5.2.3)
-    activerecord (5.2.3)
-      activemodel (= 5.2.3)
-      activesupport (= 5.2.3)
+    activemodel (5.2.4)
+      activesupport (= 5.2.4)
+    activerecord (5.2.4)
+      activemodel (= 5.2.4)
+      activesupport (= 5.2.4)
       arel (>= 9.0)
-    activestorage (5.2.3)
-      actionpack (= 5.2.3)
-      activerecord (= 5.2.3)
+    activestorage (5.2.4)
+      actionpack (= 5.2.4)
+      activerecord (= 5.2.4)
       marcel (~> 0.3.1)
-    activesupport (5.2.3)
+    activesupport (5.2.4)
       concurrent-ruby (~> 1.0, >= 1.0.2)
       i18n (>= 0.7, < 2)
       minitest (~> 5.1)
@@ -221,7 +221,7 @@ GEM
     netrc (0.11.0)
     newrelic_rpm (6.7.0.359)
     nio4r (2.5.2)
-    nokogiri (1.10.5)
+    nokogiri (1.10.7)
       mini_portile2 (~> 2.4.0)
     nyan-cat-formatter (0.12.0)
       rspec (>= 2.99, >= 2.14.2, < 4)
@@ -261,18 +261,18 @@ GEM
       rack
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
-    rails (5.2.3)
-      actioncable (= 5.2.3)
-      actionmailer (= 5.2.3)
-      actionpack (= 5.2.3)
-      actionview (= 5.2.3)
-      activejob (= 5.2.3)
-      activemodel (= 5.2.3)
-      activerecord (= 5.2.3)
-      activestorage (= 5.2.3)
-      activesupport (= 5.2.3)
+    rails (5.2.4)
+      actioncable (= 5.2.4)
+      actionmailer (= 5.2.4)
+      actionpack (= 5.2.4)
+      actionview (= 5.2.4)
+      activejob (= 5.2.4)
+      activemodel (= 5.2.4)
+      activerecord (= 5.2.4)
+      activestorage (= 5.2.4)
+      activesupport (= 5.2.4)
       bundler (>= 1.3.0)
-      railties (= 5.2.3)
+      railties (= 5.2.4)
       sprockets-rails (>= 2.0.0)
     rails-controller-testing (1.0.4)
       actionpack (>= 5.0.1.x)
@@ -289,9 +289,9 @@ GEM
     rails-timeago (2.18.0)
       actionpack (>= 3.1)
       activesupport (>= 3.1)
-    railties (5.2.3)
-      actionpack (= 5.2.3)
-      activesupport (= 5.2.3)
+    railties (5.2.4)
+      actionpack (= 5.2.4)
+      activesupport (= 5.2.4)
       method_source
       rake (>= 0.8.7)
       thor (>= 0.19.0, < 2.0)
@@ -481,7 +481,7 @@ DEPENDENCIES
   puma
   pundit
   rack-mini-profiler
-  rails (= 5.2.3)
+  rails (= 5.2.4)
   rails-controller-testing
   rails-i18n
   rails-timeago

app/policies/application_policy.rb

@@ -26,11 +26,16 @@ class ApplicationPolicy
   private :no_one
 
   def everyone_in_study_group
-    study_group = @record.study_group
-    return false if study_group.blank?
+    if @record.respond_to? :study_group # e.g. submission
+      study_group = @record.study_group
+      return false if study_group.blank?
 
-    users_in_same_study_group = study_group.users
-    return false if users_in_same_study_group.blank?
+      users_in_same_study_group = study_group.users
+    else # e.g. exercise
+      study_groups = @record.user.study_groups
+      users_in_same_study_group = study_groups.collect{ |study_group|
+        study_group.users}.flatten
+    end
 
     users_in_same_study_group.include? @user
   end

app/policies/exercise_policy.rb

@@ -8,7 +8,7 @@ class ExercisePolicy < AdminOrAuthorPolicy
   end
 
   [:clone?, :destroy?, :edit?, :update?, :export_external_check?, :export_external_confirm?].each do |action|
-    define_method(action) { admin? || author? }
+    define_method(action) { admin? || teacher_in_study_group || author? }
   end
 
   [:implement?, :working_times?, :intervention?, :search?, :submit?, :reload?].each do |action|

package.json

@@ -1,8 +1,8 @@
 {
   "dependencies": {
-    "@rails/webpacker": "4.0",
+    "@rails/webpacker": "4.2",
     "bootstrap": "^4.1.3",
-    "bootswatch": "^4.1.3",
+    "bootswatch": "^4.4.1",
     "chosen-js": "^1.8.7",
     "d3": "^5.9.2",
     "d3-tip": "^0.9.1",
@@ -13,13 +13,13 @@
     "jstree": "^3.3.8",
     "opensans-webkit": "^1.0.1",
     "popper.js": "^1.15.0",
-    "snyk": "^1.189.0",
+    "snyk": "^1.256.0",
     "underscore": "^1.9.1",
     "vis": "^4.21.0",
     "webpack-merge": "^4.1.4"
   },
   "devDependencies": {
-    "webpack-dev-server": "3.4.1"
+    "webpack-dev-server": "3.9.0"
   },
   "scripts": {
     "webpack": "./bin/webpack",