标签: nested-attributes

我有一个嵌套属性的模型:

class Foo < ActiveRecord::Base
    has_many :bar
    accepts_nested_attributes_for  :bar
end

它工作正常.但是我想确保每一个Foo,我至少有两个Bar.我无法访问bar_attributes我的验证,所以我似乎无法验证它.

有没有干净的方法呢？

什么相当于<%= f.hidden_field :_destroy %>nullify而不是毁灭？(即我只是将它从关联中删除,但我不想破坏它).

一个示例情况是:

class Foo < ActiveRecord::Base
  has_many :bar, :dependent=>:nullify, :autosave=>true
  accepts_nested_attributes_for :bar, :reject_if => proc { |attributes| attributes.all? {|k,v| v.blank?} }


class Bar < ActiveRecord::Base
  belongs_to :foo

在Foo中edit.html.erb:

<%= f.fields_for :bar do |builder| %>
   <%= builder.some_rails_helper %>
   <%= builder.hidden_field :_remove  #<-- set value to 1 to destroy, but how to unassociate?%> 
<% end %>

对解决方案的一个小修改

def remove
  #!self.foo_id.nil? should be:
  false #this way newly created objects aren't destroyed, and neither are existing ones. …

也许我不知道如何询问/搜索这个特定的东西,但基本上我想在创建父对象时创建一些相关的模型...说我有以下情况:

我有Recipe哪些has_many Ingredient车型？有没有一种方法,使他们一次全部,说这是我的例子种子任务的一部分:

Recipe.create({
  :title => 'apple pie',
  :description => 'just apple pie',
  :ingredients => {
    [0] => {:title => 'apples'},
    [1] => {:title => 'sugar'},
    [2] => {:title => 'pie crust'}
  }
})

或者就像我完全疯了一样？必须有某种方式来做同样的事情,不创建父模型,然后所有的孩子......等等.

我阅读了很多关于`has_one关系和嵌套属性的页面,但是没有成功地完成这项工作.任何帮助都会很棒.

每个用户都有_one网络.我正在尝试以一种形式收集两个属性的信息,但不断获得异常ActiveRecord::AssociationTypeMismatch in UsersController#create

传递的参数是:

{"utf8"=>"✓",
 "authenticity_token"=>"I54tm1ovzHEHaXbBLTT+5tqBJv2795sKg978ot3HDBc=",
 "user"=>{"name"=>"Bilbo Baggins",
 "email"=>"bilbo@lotr.com",
 "password"=>"[FILTERED]",
 "password_confirmation"=>"[FILTERED]",
 "network"=>{"home_lng"=>"-87.91894912719727",
 "home_lat"=>"43.03812464542969",
 "center_lng"=>"-87.91894912719727",
 "center_lat"=>"43.03812464542969",
 "radius"=>"500"}},
 "commit"=>"Sign up"}

我猜测参数Network必须以某种方式出现,network_attributes但我不知道如何.

控制器:

def create
    @user = User.new(params[:user])
    if (@user.save)
      sign_in @user
      flash[:success] = "One ring to rule them all!"
      redirect_to @user
    else
      @title = "The journey begins..."
      render 'new'
    end
end

视图:

<%= f.label :name %>
<%= f.text_field :name %>
<%= f.label :email %>
<%= f.text_field :email %><br />
<%= f.label :password %>
<%= f.password_field :password …

我遇到嵌套属性和Devise的问题.与如何在设计模型中使用嵌套属性类似的问题.据我所知,我已按照此处的建议设置了所有内容: 覆盖设计注册控制器

我已经设置了关联的用户和订阅,我已经"accepts_nested_attributes_for"和包括:subscriptions_attributes中attr_accessible,但我从设计控制器警告.

class User < ActiveRecord::Base
    devise :database_authenticatable, :registerable,:recoverable, :rememberable, :trackable, :validatable
    validates_presence_of :first_name, :last_name
    has_many :subscriptions
    accepts_nested_attributes_for :subscriptions
    attr_accessible :first_name, :last_name, :email, :password, :password_confirmation, :remember_me, :subscriptions_attributes    
    ... 
end

-

class Subscription < ActiveRecord::Base
  belongs_to :user
  validates_presence_of :user_id, :chargify_subscription_id, :chargify_product_handle
  attr_accessible :user_id, :chargify_subscription_id, :chargify_product_handle
  ... 
end

设计/注册/ new.html.erb:

<%= form_for(resource, :as => resource_name, :url => registration_path(resource_name)) do |f| %>
    <%= devise_error_messages! %>
    <p><%= f.label :first_name %><br />
      <%= f.text_field :first_name %></p> …

我正在使用Rails 3.2.6,这是一个示例案例:

class Man < ActiveRecord::Base
  has_many :eyes
  accepts_nested_attributes_for :eyes
end
class Eye < ActiveRecord::Base
  belongs_to :man
  validates_inclusion_of :color, in: { %w[brown green blue] }
end

意见(在HAML中):

= form_for @man do |f|
  - if @man.errors.any?
    #error_explanation
      %h2= t 'errors.messages.record_invalid', count: @man.errors.count
      %ul
        - @man.errors.full_messages.each do |msg|
          %li= msg

  = f.fields_for(:eyes) do |b|
    .field
      = b.label :color
      = b.text_field :color

  .actions
    = f.submit :submit

it.yml:

it:
  activerecord:
    attributes:
      customer:
        eyes: Occhi
      customer/eyes:
        color: Colore
  errors:
    models:
      man/eyes:
        attributes:
          color:
            inclusion: non …

我正在尝试在我的主页上显示评论列表,同时显示每个评论的评分.

我想要一个逗号分隔的每个评论附带的不同评级列表(基于相关的review_id); 评级是-5到5的整数.加载页面时我得到的是:

Review 1. #<ActiveRecord::Relation:0x007f9879749a50>
Review 2. #<ActiveRecord::Relation:0x007f9879749a50>
Review 3. #<ActiveRecord::Relation:0x007f9879749a50>
Review 4. #<ActiveRecord::Relation:0x007f9879749a50>
Review 5. #<ActiveRecord::Relation:0x007f9879749a50>

当我想看到这个:

Review 1. 1, 5, 2, -3
Review 2. 2, -1
Review 3. 1, 1, 4, 5
Review 4. -5, -2, -3
Review 5. 1, 1, 3, 2, 1, 5, 3, 2

用户模型:

class User < ActiveRecord::Base
  attr_accessible :name, :email, :password, :password_confirmation, :remember_me, :ratings_attributes, :reviews_attributes

  has_many :reviews, dependent: :destroy
  has_many :ratings, :through => :reviews, dependent: :destroy
  accepts_nested_attributes_for :ratings, allow_destroy: true
  accepts_nested_attributes_for :reviews, …

我正在尝试创建一篇文章.

class Article < ActiveRecord::Base

 belongs_to :article_skill
  attr_accessible :articles_skill_attributes

  accepts_nested_attributes_for :articles_skill 
end

class ArticlesSkill < ActiveRecord::Base
  attr_accessible :description, :name

  has_many :articles

end

这是我的形式 article/new.html.erb

 <%= article_form.fields_for :articles_skill, @article.articles_skill do |b|%>
    <label class="medium"><span class="red">*</span> Skill</label>
    <%= b.select :id, options_for_select(ArticlesSkill.all.collect{|m| [m.name, m.id]}) %>  
  <%end%>

这article_form是@article表单对象的构建器.

如果我尝试保存@article对象,则显示此错误.

Couldn't find ArticlesSkill with ID=1 for Article with ID=

在Rails 3.2应用程序中,我使用简单表单来创建复杂的表单.

表单/模型accepts_nested_attributes_for,我需要获取子对象的索引.

型号:

class Project
  has_many :tasks
  accepts_nested_attributes_for :tasks
end

class Task
  belongs_to :project
end

表格

<%= simple_form_for @project do |f| %>
  <%= f.simple_fields_for :tasks do |builder| %>
    ## I need to get the index of each object built via builder
  <% end %>
<% end %>

我如何正确获取索引？

我正在使用嵌套的params(通过hansack嵌套为q)和普通的params一起在页面上构建链接,当我尝试将嵌套的params与其他params合并时,我很难让两者完美地玩.

例如,如果我有:

{"freq"=>"weekly", "loan_amount"=>"350000",
"q"=>{"lowEquity_true"=>"1", "s"=>"rate asc"}}

并尝试构建一个链接来更改param"lowEquity_true"

rates_url(params[:q].merge(:lowEquity_true => '0'))

然后我最终得到了下面的新参数,看起来像是更新了q但是丢掉了其余的参数.

{"lowEquity_true"=>"0", "s"=>"rate asc"}

如果我试图将q&merge合并到其他参数中,它不会更新q,只是将q中的内容合并到其他参数中

rates_url(params[:q].merge(:lowEquity_true => '0').merge(params))

{"freq"=>"weekly", "loan_amount"=>"350000", "lowEquity_true"=>"0",
 "q"=>{"lowEquity_true"=>"1", "s"=>"rate asc"},
 "s"=>"rate asc"}

我已经尝试了各种各样的组合,似乎没有任何地方,所以我确信我错过了一些基本的东西!