编辑:添加了更新操作,以及错误发生在哪一行

模型:

class Match < ActiveRecord::Base  
  has_and_belongs_to_many :teams
  has_many :match_teams
  has_many :teams, :through => :match_teams
  accepts_nested_attributes_for :match_teams, :allow_destroy => true
end

控制器:

  def new
    @match = Match.new
    @match_teams = 2.times do
      @match.match_teams.build
    end

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

  def update
    @match = Match.find(params[:id])

    respond_to do |format|
      if @match.update_attributes(params[:match])
        format.html { redirect_to @match, notice: 'Match was successfully updated.' }
        format.json { head :ok }
      else
        format.html { render action: "edit" } …

我有以下型号:user,role,user_role(user_role是一个连接模型)

我正在尝试使用用户#edit页面上的复选框编辑用户的角色.这是我的尝试,我觉得我错过了一些重要的事情,或采取了错误的方法.

user.rb

has_many :user_roles, dependent: :destroy
has_many :roles, through: :user_roles

attr_accessible :user_roles_attributes

accepts_nested_attributes_for :user_roles, reject_if: lambda { |a| a[:role_id] == 0 }, allow_destroy: true

def has_role?(role_sym)
  roles.any? { |r| r.name.underscore.to_sym == role_sym.downcase }
end

def setup_roles!
  Role.all.each { |role|
    user_roles.build(user_id: id, role_id: role.id) unless has_role?(role.name.to_sym)
  }
end

user_role.rb

belongs_to :user
belongs_to :role
delegate :name, to: :role

role.rb

has_many :user_roles
has_many :users, through: :user_role

users_controller.rb

def edit
  @user = User.find(params[:id])
  @user.setup_roles!
end …

我有类似的东西:

class Profile < ActiveRecord::Base
   belongs_to :user    
   delegate :full_name, :to => :user

   accepts_nested_attributes_for :user
   .......

这工作正常,因为我希望配置文件能够在用户中设置first_name和last_name.但是,如果用户在表单中注入其他参数,这会带来安全威胁.

如何使accepts_nested_attributes_for只接受first_name和last_name并删除其他参数？

我明白了

ActiveRecord :: RecordNotFound:对于ID =的订单,找不到ID = 3的客户端

在尝试为现有客户提交订单时.这通过键入以下内容通过表单或控制台进行:

Order.new(:client_attributes => { :id => 3 })

payment_form.html.erb:

<%= semantic_form_for @order, :url => checkout_purchase_url(:secure => true) do |f| %>

        <%= f.inputs "Personal Information" do %>

            <%= f.semantic_fields_for :client do |ff| %>
                <%= ff.input :first_name %>
                <%= ff.input :last_name %>              
                <!-- looks like semantic_fields_for auto-inserts a hidden field for client ID -->
            <% end %>

        <% end %>
<% end %>

Order.rb:

class Order < ActiveRecord::Base
  belongs_to :client
  accepts_nested_attributes_for :client, :reject_if …

鉴于以下内容:

楷模

class Location < ActiveRecord::Base
  has_many :games
end

class Game < ActiveRecord::Base
  validates_presence_of :sport_type

  has_one :location
  accepts_nested_attributes_for :location
end

调节器

  def new
    @game = Game.new
  end

查看(表格)

<%= simple_form_for @game do |f| %>
  <%= f.input :sport_type %>
  <%= f.input :description %>
  <%= f.simple_fields_for :location do |location_form| %>
    <%= location_form.input :city %>
  <% end %>
  <%= f.button :submit %>
<% end %>

为什么位置字段(城市)没有出现在表单中？我没有收到任何错误.我错过了什么？

我尝试在rails4中创建一对多连接.但是,虽然我没有收到错误,但不存储嵌套属性.

我究竟做错了什么？

站的模型

class Station < ActiveRecord::Base
    has_many :adresses

    accepts_nested_attributes_for :adresses
end

ADRESS-型号

    class Adress < ActiveRecord::Base
        belongs_to :station
    end

Station-Controller 类StationsController <ApplicationController

    def new
        @station = Station.new
        @station.adresses.build
    end

    def create
        @station = Station.new(station_params)
        @station.save
        redirect_to @station
    end

    def index
        @stations = Station.all
    end

private

    def station_params
        params.require(:station).permit(:name, adresses_attributes: [ :url ])
    end

end

站:new.html.erb

<%= form_for :station, url: stations_path do |station| %>
    <p>
        <%= station.label :name %><br />
        <%= station.text_field :name %>
    </p>
    <%= station.fields_for :adresses do |adress| …

在使用Rails 4强参数时,我正在努力寻找处理嵌套表单的正确和干燥方式.

我有一些模型,我在我的应用程序中以不同的方式重新使用,因此我有一些嵌套的表单.

问题是当我使用嵌套表单时,我不觉得我正在做DRYest方法.

考虑以下是AccountsController:

params.require(:account).permit(
  person_attributes: [
    :name,
    address: [
      :city
    ]
  ]
)

从我的角度来看person_attributes,不应该进入AccountsController.我的意思是,AccountsController不应该对Person类有太多了解.

我想添加这样的允许属性,PeopleController但它是一个不能直接访问的私有方法.

现在我正在考虑将类允许的属性存储在类方法中,Person.permitted_attributes但我不确定这是否是一个聪明的设计决策.这样做我可以在几个地方使用它.我显然会为每个控制器编写单独的测试.

我理解参数过滤应该在控制器中完成,而不是在模型中完成,但我不确定添加代码重复是否是一个很好的权衡.

你们怎么看待这件事？

这是我的3个型号.

User
    has_many :memberships
    has_many :teams, through: :memberships, dependent: :destroy
    accepts_nested_attributes_for :memberships

Team
    has_many :memberships
    has_many :users, through: :memberships, dependent: :destroy
    accepts_nested_attributes_for :memberships

Membership
    belongs_to :team
    belongs_to :user

以下是我的Team控制器的一些部分.我的目标是向某个团队添加/更新成员.请注意,添加成员的源已作为一组用户存在.

TeamsController
    def create
        @team = Team.new(team_params)
        @team.users << User.find(member_ids) #add leader and members to team
        if @team.save 
            #redirect to created team
        else
            #show errors
        end
    end

    def update
        #TO DO: update team roster here
        if @team.update(team_params)
            #redirect to updated team
        else
            #show errors
        end
    end

Team控制器的强参数

#parameters for team details
def …

我的模特:

class Foo < ActiveRecord::Base
  has_many :bars, inverse_of: :foo
  accepts_nested_attributes_for :bars

  ...
end

class Bar < ActiveRecord::Base
  belongs_to :foo, inverse_of: :bars

  ...
end

当我尝试创建这样的记录时:

Foo.create(foo_attribute: value, bars_attirbutes: [{bar_attribute: value}])

我明白了:

ActiveRecord::InvalidForeignKey: PG::ForeignKeyViolation: ERROR:  insert or update on table "bars" violates foreign key constraint "bars_foo_id_fkey"
DETAIL:  Key (foo_id)=(14) is not present in table "foos".

所以我想ActiveRecord试图在保存父模型之前保存嵌套模型,从而导致错误.但为什么这样做呢？我怎么能阻止它这样做呢？

我尝试使用CarrierWave上传文件,Image模型是多态的.但我得到了标题中的错误,所以这是我的模型:

class Image < ActiveRecord::Base
    belongs_to :imageable, polymorphic: true

    mount_uploader :image, ImageUploader

    enum image_type: {icon: 1, title: 2, regular: 3, slider: 4}
end

class Service < ActiveRecord::Base
    has_many :images, as: :imageable, :dependent => :destroy
    accepts_nested_attributes_for :images

end

和_form.html.erb:

<div class="control-group">
   <%= simple_fields_for :images do |image| %>


     <div class="controls">
        <label class="control-label">Hizmet Büyük Resimi</label> 
        <div class="fileupload fileupload-new" data-provides="fileupload">
          <div class="fileupload-new thumbnail" style="width: 200px; height: 150px;"><img src="http://www.placehold.it/200x150/EFEFEF/AAAAAA&amp;text=no+image" alt=""/></div>
          <div class="fileupload-preview fileupload-exists thumbnail" style="max-width: 200px; max-height: 150px; line-height: 20px;"></div>
          <div>
            <span class="btn btn-file"><span class="fileupload-new">Resim …