Update schema to reflect re-usable error_template_attributes, descriptions, hints, and sorting

app/models/error_template.rb

@@ -1,3 +1,4 @@
 class ErrorTemplate < ActiveRecord::Base
   belongs_to :execution_environment
+  has_and_belongs_to_many :error_template_attributes
 end

app/models/error_template_attribute.rb

@@ -1,3 +1,3 @@
 class ErrorTemplateAttribute < ActiveRecord::Base
-  belongs_to :error_template
+  has_and_belongs_to_many :error_template
 end

app/models/execution_environment.rb

@@ -11,6 +11,7 @@ class ExecutionEnvironment < ActiveRecord::Base
   has_many :exercises
   belongs_to :file_type
   has_many :hints
+  has_many :error_templates
 
   scope :with_exercises, -> { where('id IN (SELECT execution_environment_id FROM exercises)') }
 

db/migrate/20170711170456_add_description_and_hint_to_error_template.rb

@@ -0,0 +1,9 @@
+class AddDescriptionAndHintToErrorTemplate < ActiveRecord::Migration
+  def change
+    add_column :error_templates, :description, :text
+    add_column :error_templates, :hint, :text
+
+    add_column :error_template_attributes, :description, :text
+    add_column :error_template_attributes, :important, :boolean
+  end
+end

db/migrate/20170711170928_change_error_template_attribute_relationship_to_n_to_m.rb

@@ -0,0 +1,6 @@
+class ChangeErrorTemplateAttributeRelationshipToNToM < ActiveRecord::Migration
+  def change
+    remove_belongs_to :error_template_attributes, :error_template
+    create_join_table :error_templates, :error_template_attributes
+  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: 20170703080355) do
+ActiveRecord::Schema.define(version: 20170711170928) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -48,11 +48,17 @@ ActiveRecord::Schema.define(version: 20170703080355) do
   end
 
   create_table "error_template_attributes", force: :cascade do |t|
-    t.integer  "error_template_id"
     t.string   "key"
     t.string   "regex"
-    t.datetime "created_at",        null: false
+    t.datetime "created_at",  null: false
-    t.datetime "updated_at",        null: false
+    t.datetime "updated_at",  null: false
+    t.text     "description"
+    t.boolean  "important"
+  end
+
+  create_table "error_template_attributes_templates", id: false, force: :cascade do |t|
+    t.integer "error_template_id",           null: false
+    t.integer "error_template_attribute_id", null: false
   end
 
   create_table "error_templates", force: :cascade do |t|
@@ -61,6 +67,8 @@ ActiveRecord::Schema.define(version: 20170703080355) do
     t.string   "signature"
     t.datetime "created_at",               null: false
     t.datetime "updated_at",               null: false
+    t.text     "description"
+    t.text     "hint"
   end
 
   create_table "errors", force: :cascade do |t|