在Rails中通过id查找数组元素

Question

我是Rails的新手（来自PHP）。所以请原谅这个基本的数据结构问题：

在控制器：

@games = Game.all 
@players = Player.all 

在视图：

<% @games.each do |game| %> 
    <%= game.player_id %> 
<% end %> 

当遍历@games，而不是与游戏显示玩家ID。 player_id，我想显示可以在Player对象（：name）中找到的播放器名称。

如何通过存储在game.player_id中的id找到正确的玩家记录？

Answer 1

在控制器：

@games = Game.all(:include => :player) 

在视图：

<% @games.each do |game| %> 
    <%= game.player.name %>  
<% end %> 

你的数据模型看起来很奇怪我。对于类似的问题，我的数据模型可能是这样的：

class Game < ActiveRecord::Base 
    has_many :game_players 
    has_many :players, :through => :game_players 
end 

class GamePlayer < ActiveRecord::Base 
    belongs_to :game 
    belongs_to :player 
end 

class Player < ActiveRecord::Base 
    has_many :game_players 
    has_many :games, :through => :game_players 
end 

现在在控制器中我将查询游戏：

@games = Game.all(:include => :players) 

在视图：

<%@games.each do |game| %> 
    <% games.players.each do |player| %> 
    <%= player.name %> 
    <%end%> 
<%end%> 

编辑1

如果你有一个团队的概念，那么我将我ntroduce组队模式：

class Player < ActiveRecord::Base 
    has_many :team_players 
    has_many :teams, :through => :team_players 
end 

class TeamPlayer < ActiveRecord::Base 
    belongs_to :player 
    belongs_to :team 
end 

class Team < ActiveRecord::Base 
    has_many :team_players 
    has_many :players, :through => :team_players 
    belongs_to :game 
    # attributes name, score team size constraints etc. 
end 

class Game 
    has_many :teams 
    has_many :players, :through => :teams. 
end 

添加新的游戏：

@game = Game.new 

@team_a = @game.teams.build(:name => "Foo") 
@team_a.players << Player.find_all_by_name(["John", "Grace"]) 

@team_b = @game.teams.build((:name => "Bar") 
@team_b.players << Player.find_all_by_name(["Kelly", "Yuvan"]) 

@game.save 

在查询时在你的控制器的游戏：

@games = Game.all(:include => [{:teams => :players}]) 

在你看来：

<%@games.each do |game| %> 
    <% games.teams.each do |team| %> 
    <% team.players.each do |team| %> 
     <%= player.name %> 
    <%end%> 
    <%end%> 
<%end%>