SQL 查询 Ruby On Rails

Question

我有两个型号team 和fixture。 fixture 模型有两列home_team_id 和away_team，其中包含team 的主键的外键。

我正在尝试进行选择查询，我可以使用夹具表中的home_team_id 和away_team_id 获取团队名称。

class Fixture < ActiveRecord::Base
    attr_accessible :away_score, :away_team_id, :home_score, :home_team_id, :result, :week
    belongs_to :team, :class_name => Team
end

class Team < ActiveRecord::Base
    attr_accessible :form, :name
    has_many :fixtures, :class_name => Fixture, :foreign_key => :home_team_id
    has_many :fixtures, :class_name => Fixture, :foreign_key => :away_team_id
end

我是否需要在 Fixtures 控制器中执行 SQL 查询，然后如何在我的 fixture 视图中显示它？

这是我尝试查询但没有运气。在我的灯具秀中，我有：

<p>
  <b>Home team:</b>
  <%= Team.find_by_sql("SELECT name FROM teams WHERE team.id = fixtures_home_team_id")     %>
</p>

Answer 1

像这样重写你的模型：

class Fixture < ActiveRecord::Base
  attr_accessible :away_score, :away_team_id, :home_score, :home_team_id, :result, :week
  belongs_to :home_team, :class_name => 'Team'
  belongs_to :away_team, :class_name => 'Team'
end

class Team < ActiveRecord::Base
  attr_accessible :form, :name
  has_many :home_fixtures, :class_name => 'Fixture', :foreign_key => :home_team_id
  has_many :away_fixtures, :class_name => 'Fixture', :foreign_key => :away_team_id
end

现在您可以在控制器中执行此操作：

@fixture = Fixture.find(params[:id])

在你看来：

<p>Away Team: <%= @fixture.away_team.name %></p>
<p>Home Team: <%= @fixture.home_team.name %></p>