复选框用于多对多关系

Question

class PlayerProfile < ActiveRecord::Base

  has_many :playing_roles
  has_many :player_roles, through: :playing_roles

  accepts_nested_attributes_for :playing_roles, :allow_destroy => true

end

class PlayingRole < ActiveRecord::Base
      belongs_to :player_roles
      belongs_to :player_profile
 end

class PlayerRole < ActiveRecord::Base
  has_many :playing_roles
  has_many :player_profiles, through: :playing_roles
end 

Schema.rb

    create_table "player_profiles", force: true do |t|
    t.integer  "user_id"
    t.string   "firstname"
    t.string   "lastname"
    t.date     "birthdate"
    t.string   "favorite_team"
    t.string   "mobile"
    t.string   "address"
    t.string   "lang"
    t.string   "team"
    t.integer  "weight"
    t.integer  "height"
    t.text     "biography"
    t.string   "idols"
    t.datetime "created_at"
    t.datetime "updated_at"
    t.string   "nationality"
  end
  add_index "player_profiles", ["user_id"], name: "index_player_profiles_on_user_id", using: :btree
  create_table "player_roles", force: true do |t|
    t.string "name"
  end
  create_table "playing_roles", force: true do |t|
    t.integer  "player_profile_id"
    t.integer  "player_role_id"
    t.datetime "created_at"
    t.datetime "updated_at"
  end

我需要显示播放器可以播放的每个角色的复选框.选中的复选框表示关于"playing_roles"重新关系的记录

在Rails4中使用collection_check_boxes:

UPDATE

如果我使用:playing_role_ids我收到此错误:

<%=collection_check_boxes(:player_profile, :playing_role_ids, PlayerRole.all, :id, :name)%>     

它似乎正在寻找关系中的记录,但如果记录不存在则意味着没有关系,并且必须取消选中该复选框.

Answer 1

在Rails 3.x中,使用simple_form:

<%= simple_form_for @player_profile do |f| %>
  <%= f.association :player_roles, as: :check_boxes %>
  ...
<% end %>

在Rails 4中,使用collection_check_boxeswrite

<%=collection_check_boxes(:player_profile, :playing_role_ids, PlayerRole.all, :id, :name)%> 

您必须使用该名称,:playing_roles_ids因为您要分配ID而不是PlayRoles.