CODEWITHSUNDEEP
ruby-on-railsruby-on-rails-3eager-loading
HUSTEN
HUSTEN

Reputation: 5197

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

I have 4 models such as below

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

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>

Upvotes: 1

Views: 1690

Answers (1)

Mike Campbell
Mike Campbell

Reputation: 7978

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.

Upvotes: 1

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