extended execution environments by a default file type that is used as the default for associated exercises' files

db/migrate/20150310150712_add_file_type_id_to_execution_environments.rb

@@ -0,0 +1,5 @@
+class AddFileTypeIdToExecutionEnvironments < ActiveRecord::Migration
+  def change
+    add_reference :execution_environments, :file_type
+  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: 20150204080832) do
+ActiveRecord::Schema.define(version: 20150310150712) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -45,6 +45,7 @@ ActiveRecord::Schema.define(version: 20150204080832) do
     t.integer  "user_id"
     t.string   "user_type"
     t.integer  "pool_size"
+    t.integer  "file_type_id"
   end
 
   create_table "exercises", force: true do |t|