Add an option to make model solutois visible before completion

Author: nygrenh

app/models/solution.rb

@@ -21,6 +21,8 @@ def visible_to?(user)
       true
     elsif user.guest?
       false
+    elsif @exercise.course.model_solution_visible_before_completion?
+      true
     elsif @exercise.completed_by?(user)
       true
     elsif !@exercise.course.visible_to?(user)

db/migrate/20180903081927_model_solutions_visble_before_completion.rb

@@ -0,0 +1,5 @@
+class ModelSolutionsVisbleBeforeCompletion < ActiveRecord::Migration
+  def change
+    add_column :courses, :model_solution_visible_before_completion, :boolean, null: false, default: false
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20180903074526) do
+ActiveRecord::Schema.define(version: 20180903081927) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -93,26 +93,27 @@
     t.datetime "created_at"
     t.datetime "updated_at"
     t.datetime "hide_after"
-    t.boolean  "hidden",                         default: false, null: false
-    t.integer  "cache_version",                  default: 0,     null: false
+    t.boolean  "hidden",                                   default: false, null: false
+    t.integer  "cache_version",                            default: 0,     null: false
     t.string   "spreadsheet_key"
     t.datetime "hidden_if_registered_after"
     t.datetime "refreshed_at"
-    t.boolean  "locked_exercise_points_visible", default: true,  null: false
+    t.boolean  "locked_exercise_points_visible",           default: true,  null: false
     t.text     "description"
     t.string   "paste_visibility"
     t.string   "formal_name"
-    t.boolean  "certificate_downloadable",       default: false, null: false
+    t.boolean  "certificate_downloadable",                 default: false, null: false
     t.string   "certificate_unlock_spec"
     t.integer  "organization_id"
-    t.integer  "disabled_status",                default: 1
+    t.integer  "disabled_status",                          default: 1
     t.string   "title"
     t.string   "material_url"
-    t.integer  "course_template_id",                             null: false
-    t.boolean  "hide_submission_results",        default: false
+    t.integer  "course_template_id",                                       null: false
+    t.boolean  "hide_submission_results",                  default: false
     t.string   "external_scoreboard_url"
-    t.boolean  "initial_refresh_ready",          default: false
-    t.boolean  "hide_submissions",               default: false, null: false
+    t.boolean  "initial_refresh_ready",                    default: false
+    t.boolean  "hide_submissions",                         default: false, null: false
+    t.boolean  "model_solution_visible_before_completion", default: false, null: false
   end
 
   add_index "courses", ["organization_id"], name: "index_courses_on_organization_id", using: :btree