How can I use eager loading with scope in complicated nested association?

Question

I have 4 models such as below

• User (has 1 profile, many communities, and many codes)
• Profile (belongs to user)
• Community (has many codes, belongs to user)
• Code (belongs to both community and user)

Now I'm trying to show 10 records of the code that belongs to particular community.

This code contains external table's info such as

• username(in user table)
• comment(in profile table)
• point(in profile table)

Now, it's issuing many sql queries because I'm not using eager loading.
In this case, how can I customize my code to make this eager loading in order to make load speed faster?

controllers/communities_controller.rb

#CanCan load_and_authorize_resouce
load_and_authorize_resource :find_by => :community_name,

models/community.rb

belongs_to :user
has_many :codes

models/code.rb

belongs_to :user, counter_cache: true
belongs_to :community, counter_cache: true

scope :recent, lambda { |n = 10| includes(:user).where('users.deleted_at' => nil).order("users.last_active_at DESC").limit(n) }

models/user.rb

has_one :profile
has_many :communities
has_many :codes

models/profile.rb

belongs_to :user

views/communityes/show.html.erb

<% @community.codes.recent.each do |code| %>
    <%= render 'codes/code', {:code => code, :icon_photo => code.user.profile.user_avatar} %>
<% end %>

views/communityes/_code.html.erb

<tr>
    Username: <%= code.user.username %> <br />
    Code: <%= code.data %> <br />
    Comment: <%= code.user.profile.comment %> <br />
    Point: <%= code.user.profile.point.to_s %>
</tr>

Answer 1

Shouldn't be particularly complicated, just .includes all the bits you want to eager load ..

@community.codes.recent.includes(user: :profile)

Also, are a Community's codes always equal to that of all of it's Users? If so, you should be using a has_many :codes, through: :users association on Community.