Question

经过几个小时阅读stackoverflow并观看railscast，我决定发布。问题非常相似，如果与其他许多问题不完全相同，但我只是没有得到它。这是我的第一个has_many_through协会。

class User < ActiveRecord::Base
...
has_many :affiliations
has_many :sublocations, through: :affiliations
...
end

class Sublocation < ActiveRecord::Base
...
has_many :affiliations
has_many :users, through: :affiliations
...
end

class Affiliations < ActiveRecord::Base
...
belongs_to :user
belongs_to :sublocation
...
end

affiliations表具有通常的user_id和sublocation_id列。它还有一个名为'default'的布尔列。在我的“新/编辑用户”表单中，我需要通过复选框选择一个或多个子位置，还包括将子位置标记为“默认”的方法。

同样，我在例子之后阅读了一些例子，但事实并非只是在我脑中“点击”。我不一定在寻找一个确切的解决方案，而是在正确的方向上轻推。

非常感谢， CRS

Answer 1

我的建议：

创建用户表单以设置User和Sublocation

之间的关联

我假设sublocations已预先填充？

<强> users_controller.rb

def new
    @user = User.new
    @sublocations = Sublocation.all
    respond_to do |format|
      # what ever
    end
end

def create
    @user = User.new(params[:user])
    params[:sublocation_ids].each do |key, value|
      @user.affiliations.build(sublocation_id: value)
    end
    respond_to do |format|
      if @user.save
        # what ever
      else
        # what ever
      end
    end
 end

def show
    @user = User.find(params[:id])
    @affiliations = @user.affiliations
end

def set_default
    affiliation = Affiliation.find(params[:affiliation_id])
    Affiliation.where(user_id: params[:user_id]).update_all(default: false)
    affiliation.toggle!(:default)
    redirect_to affiliation.user, notice: "Default sublocation set"
 end

用户/ _form.html.haml

= form_for @user do |f| .field # fields for user attributes .field %h1 Sublocations = f.fields_for "sublocations[]" do - for sublocation in @sublocations = label_tag sublocation.name = check_box_tag "sublocation_ids[#{sublocation.name}]", sublocation.id, @user.sublocations.include?(sublocation) .actions = f.submit 'Save'

然后可能在用户显示页面上，列出他们的所有子位置并为他们创建一个表单来设置默认值。

用户/ show.html.haml

= form_tag user_set_default_path(@user), method: :put do %table %tr %th Sublocation %th Default? - @affiliations.each do |affiliation| %tr %td= affiliation.sublocation.name %td= radio_button_tag :affiliation_id, affiliation.id, affiliation.default? ? {checked: true} : nil = submit_tag "Set default"

<强>的routes.rb

resources :users do member do put "set_default" end end

希望这有助于或至少让您走上正确的道路。

Rails has_many通过形式

1 个答案: