Rails - Group_by method doesn't work - ruby-on-rails

Question

i'm trying to group items (games) by month in rails and SQL3 but it generates this :
Error
March 17th
<% #game_months.each do |month, games| %>
<% for game in games %>
<a href="<%= game_path(game)%>" class="col-md-4 m-t-md">
<div class="box b-a m-a" style="box-shadow: 0px 4px 2px 0px rgba(0,0,0,0.02);">
Here is my games controller
class GamesController < ApplicationController
def index
#game = current_user.games
#games = Game.all.order("created_at DESC")
#game_months = #games.group_by {|g| g.created_at.beginning_of_month }
end
My view
<% #game_months.each do |month, games| %>
<% for game in games %>
<a href="<%= game_path(game)%>" class="col-md-4 m-t-md">
<div class="box b-a m-a" style="box-shadow: 0px 4px 2px 0px rgba(0,0,0,0.02);">
<div class="item b-b">
<div><%= image_tag game.photos[0].image.url(:medium), class:"img-responsive" if game.photos.length > 0 %></div>
</div>
<div class="p-a text-left white">
<h6 class="text-md text-black block p-b-sm"><strong><%= game.game_name %></strong></h6>
<span class="text-muted p-t-md"><%= game.game_description %></span>
<div class="m-t-md">
<span><%= image_tag avatar_url(game.user), class:"w-24 circle b-a" %></span>
<span class="m-t-sm text-black pull-right text-md"></span>
</div>
</div>
</div>
</a>
<% end %>
<% end %>
I don't know what i'm doing bad. Please help, i don't know what to do to solve this!
CHEERS! :)

Answer 1

Change
#games = Game.all.order("created_at DESC")
#game_months = #games.group_by {|g| g.created_at.beginning_of_month }
To
#game_months = Game.all.group_by { |g| g.created_at.month }
It should produce hash looking like this:
{1=>[GameObject1], 2=>[GameObject3, GameObject4], 3=>[GameObject2] ...}
Now iterate over hash and do what you want to do.