Implement missing & remaining pieces propagation + cleaner forms

app/controllers/completions_controller.rb

@@ -24,6 +24,7 @@ class CompletionsController < ApplicationController
     end
 
     @completion = Completion.new
+    @completion.completed = true
     if params[:contestant_id]
       @completion.contestant_id = params[:contestant_id]
     end
@@ -111,6 +112,6 @@ class CompletionsController < ApplicationController
   end
 
   def completion_params
-    params.expect(completion: [ :display_time_from_start, :remaining_pieces, :contestant_id, :message_id, :puzzle_id ])
+    params.expect(completion: [ :display_time_from_start, :completed, :missing_pieces, :remaining_pieces, :contestant_id, :message_id, :puzzle_id ])
   end
 end