ruby-on-rails - 给定索引值，我如何才能只更新 Rails Controller 中的那些值？

Question

我有一个嵌套表单，如下所述，带有一个复选框，我希望用它来仅记录我想更新的记录。我已经检查了 html，并且正在为每条记录注册正确的索引。示例属性和复选框的 html 如下所示:

<input id="game_game_rosters_attributes_0_game_id" name="game[game_rosters_attributes][0][game_id]" type="hidden" value="127">
<input id="add_0" name="add[0]" type="checkbox" value="false">

现在，我认为我应该通过检查具有相同索引的复选框是否具有值“来确定我想更新哪个game_roster_attributes真的”。但我不确定如何在我的 games_controller.rb 中执行此操作，因为它当前设置为使用 @game.update_attributes()...

批量分配我的 attr_accessible 变量

games_controller.rb

def update
  @game = Game.find(params[:id])

  respond_to do |format|
    if @game.update_attributes(params[:game])
       format.html { redirect_to @game, notice: 'Game was successfully updated.' }
       format.json { head :no_content }
    else
       format.html { render action: "edit"}
       format.json { render json: @game.errors, status: :unprocessable_entry }
    end
  end
end

嵌套形式

<%= form_for @game do |f| %>

   # @game fields for editing here...

   <% roster_options.each.with_index do |option, index| %>
     <%= f.fields_for :game_rosters, option do |fields| %>
        <%= fields.object.player.full_name %>
        <%= fields.hidden_field :player_id %>
        <%= fields.hidden_field :game_id %>
        <%= check_box_tag 'add[' + index.to_s + ']', false %>
     <% end %>
   <% end %>

<% end %>

模型

game.rb

class Game < ActiveRecord::Base
  attr_accessible :date, :game_rosters_attributes
  has_many :game_rosters
  has_many :players, :through => :game_rosters
  accepts_nested_attributes_for :game_rosters, allow_destroy: true
end

game_roster.rb

class GameRoster < ActiveRecord::Base
  attr_accessible :active, :winner, :player_id, :game_id, :placement
  belongs_to :game
  belongs_to :player
end

game_controller.rb

def new
  @game = Game.new

  respond_to do |format|
    format.html # new.html.erb
    format.json { render json: @game }
  end
end

def edit
  @game = Game.find(params[:id])
  @game_roster = GameRoster.joins(:player).where(game_id: params[:id]).order('winner DESC, placement DESC')
  @options = SeasonRoster.where("season_id = (?) AND NOT EXISTS ( SELECT * FROM game_rosters INNER JOIN games ON games.id = game_rosters.game_id WHERE game_rosters.player_id = season_rosters.player_id AND games.id = (?))", @game.season_id.to_s, @game.id.to_s)

  @roster_options = Array.new
  @options.each do |o|
    c = GameRoster.new
    c.player_id = o.player_id
    c.challenge_id = params[:id]
    c.winner = false
    @roster_options.push(c)
  end

end

Answer 1

我不确定你的要求。我假设您只想保存那些选中了“添加”字段的花名册，并删除其余的花名册。

roster.rb

class Roster < ActiveRecord::Base
  attr_accessor :add
end

游戏.rb

class Game < ActiveRecord::Base
  before_save :mark_rosters_for_removal

  def mark_rosters_for_removal
    rosters.each do |roster|
      unless roster.add
        roster.mark_for_destruction
      end
    end
  end
end

嵌套形式

<%= form_for @game do |f| %>

   # @game fields for editing here...

   <% roster_options.each.with_index do |option, index| %>
     <%= f.fields_for :game_rosters, option do |fields| %>
       <%= fields.object.player.full_name %>
       <%= fields.hidden_field :player_id %>
       <%= fields.hidden_field :game_id %>
       <%= fields.check_box :add, false %>
    <% end %>
  <% end %>

<% end %>