Question

我有两个模型：games和pickems。

以下是我对这些模型的架构：

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

游戏模型：

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模型：

class Pickem < ActiveRecord::Base
  has_one :user
  has_one :game
  has_one :winner, class_name: 'Team'
end

在我看来，我希望显示所有没有Pickem关联的游戏。我还想在下面显示所有Pickems和相关的游戏属性。我需要从控制器调用和/或添加到模型以显示此信息？

Answer 1

首先，你有

# in `pickems` table
t.integer  "game_id",    limit: 4

和

# in Pickem Model
class Pickem < ActiveRecord::Base
  ...
  has_one :game
  ...
end

我认为对于has_one belongs_to，您需要将foreign_key放在games表而不是pickems表中，它将开始有意义。即。

create_table "games", force: :cascade do |t|
  ...
  t.integer  "pickem_id", limit: 4
  ...
end

class Game < ActiveRecord::Base
  ...
  belongs_to :pickem
  ...
end

现在

我想要显示所有没有关联Pickem的游戏正在引用它

Game.where(pickem_id: nil)

一个建议

由于您的Game模型属于Pickem，Team等多个模型，因此您可以改为使用Polymorphic Association。

原因：如果您的game条记录之一属于pickem，则其他字段将为空。

Answer 2

您需要更正Games / Pickem关联，方法是将其添加到游戏模型中：

has_one :pickem

这与Pickem模型有关：

belongs_to :game

此查询将检索所有未关联Pickem的游戏：

@games_without_pickems = Game.joins(:pickem).group("games.id").having("COUNT('pickems.id') = 0").order("games.id")

更改表格引用

这将检索所有Pickems和相关的游戏信息：

@pickems = Pickem.includes(:games).all

在您看来，只需循环遍历@games_without_pickems和@pickems，就像这样：

<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>

应该这样做。

显示两种型号的独特结果

2 个答案: