Display Unique Results from Two Models - ruby-on-rails

Question

I have two models: games and pickems.
Here is my schema for these models:
create_table "games", force: :cascade do |t|
t.integer "week_id", limit: 4
t.integer "home_team_id", limit: 4
t.integer "away_team_id", limit: 4
t.integer "home_score", limit: 4
t.integer "away_score", limit: 4
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.integer "season_id", limit: 4
end
create_table "pickems", force: :cascade do |t|
t.integer "user_id", limit: 4
t.integer "game_id", limit: 4
t.integer "winner_id", limit: 4
t.integer "score", limit: 4
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
Game model:
class Game < ActiveRecord::Base
belongs_to :home_team, class_name: 'Team'
belongs_to :away_team, class_name: 'Team'
belongs_to :week
belongs_to :season
end
Pickem model:
class Pickem < ActiveRecord::Base
has_one :user
has_one :game
has_one :winner, class_name: 'Team'
end
In my view, I want to display all Games that do not have a Pickem associated that is referencing it. I also want to display below all the Pickems and the game attributes associated. What do I need to be calling from the controller and/or add to the model(s) to display this information?

Answer 1

You will need to correct the Games/Pickem association, by adding this to the Game model:
has_one :pickem
and this to the Pickem model:
belongs_to :game
This query will retrieve all of the Games that do not have a Pickem associated:
#games_without_pickems = Game.joins(:pickem).group("games.id").having("COUNT('pickems.id') = 0").order("games.id")
change table references
This will retrieve all of the Pickems and associated Games information:
#pickems = Pickem.includes(:games).all
In your view, simply loop over both #games_without_pickems and #pickems, like this:
<table>
<th>
<td>Week</td>
<td>Home Team</td>
<td>Away Team</td>
<td>Home Score</td>
<td>Away Score</td>
<td>Season</td>
</th>
<% #games_without_pickems.each do |game| %>
<tr>
<td><%= game.week.name %></td>
<td><%= game.home_team.name %></td>
<td><%= game.away_team.name %></td>
<td><%= game.home_score %></td>
<td><%= game.away_score %></td>
<td><%= game.season.name %></td>
</tr>
<% end %>
</table>
<table>
<th>
<td>User</td>
<td>Winner</td>
<td>Score</td>
<td>Week</td>
<td>Home Team</td>
<td>Away Team</td>
<td>Home Score</td>
<td>Away Score</td>
<td>Season</td>
</th>
<% #pickems.each do |pickem| %>
<tr>
<td><%= pickem.user.name %></td>
<td><%= pickem.winner.name %></td>
<td><%= pickem.score %></td>
<td><%= pickem.game.week.name %></td>
<td><%= pickem.game.home_team.name %></td>
<td><%= pickem.game.away_team.name %></td>
<td><%= pickem.game.home_score %></td>
<td><%= pickem.game.away_score %></td>
<td><%= pickem.game.season.name %></td>
</tr>
<% end %>
</table>
That should do it.

Answer 2

First of all, you have
# in `pickems` table
t.integer "game_id", limit: 4
and
# in Pickem Model
class Pickem < ActiveRecord::Base
...
has_one :game
...
end
I think for has_one belongs_to, you need to put foreign_key in games table rather than pickems table and it will start making sense.
i.e.
create_table "games", force: :cascade do |t|
...
t.integer "pickem_id", limit: 4
...
end
class Game < ActiveRecord::Base
...
belongs_to :pickem
...
end
Now
I want to display all Games that do not have a Pickem associated that
is referencing it
Game.where(pickem_id: nil)
One Suggestion
Since your Game model belongs to multiple models like Pickem, Team, etc. so you can use Polymorphic Association instead.
Reason: If one of your game record belongs to pickem then other fields will be empty.