創建一個選擇從現有或創建新的形式Rails 3

Question

所以我試圖設置組織的名稱屬性，並創建一個新的組織或從以前存在的組織從同一表單中選擇。

我試圖跟蹤Ryan Bates在這個話題在這裏railscast：http://railscasts.com/episodes/57-create-model-through-text-field

我也試圖從堆棧衆多解決方案。不過，我不能完全似乎得到它運行（即我有不承認我使用的虛擬屬性的驗證）

所以我的組織模式：

class Organization < ActiveRecord::Base 
    has_many :materials 
    has_many :users 
    has_and_belongs_to_many :causes 
    has_and_belongs_to_many :schools, :join_table => 'organizations_schools' 
####The following line has been edited #### 
    attr_accessible :name, :unlogged_books_num, :id, :new_organization_name 
    attr_accessor :new_organization_name 
    before_validation :create_org_from_name 

    validates_presence_of :name 

    def self.assign_school_to_organization(org, school) 
    orgschool = OrganizationsSchool.create(:organization_id=> org.id, :school_id=> school[0]) 
    end 

def create_org_from_name 
    create_organization(:name=>new_organization_name) unless new_organization_name.blank? 
end 
end 

我有也試過create_org_from_name如下所示：

def create_org_from_name 
    self.name = new_organization_name 
end 

而且這並不驗證或保存實例之前，將名稱更改爲組織名稱。 我也試圖改變before_save到before_validation，並沒有奏效

我對組織控制器（我也試圖改變這一點創建）

def create 
    respond_to do |format| 
     @organization = Organization.new(params[:organization]) 
     @organization.name = @organization.new_organization_name unless @organization.new_organization_name.blank? 
     if @organization.save 
     @school = params[:school] 
     Organization.assign_school_to_organization(@organization, @school)  
     format.html { redirect_to @organization, notice: 'Organization was successfully created.' } 
     format.json { render json: @organization, status: :created, location: @organization } 
     else 
     format.html { render action: "new" } 
     format.json { render json: @organization.errors, status: :unprocessable_entity } 
     end 
    end 
    end 

最後，我有什麼我的形式目前正在做：

<%= form_for(@organization) do |f| %> 
    <% if @organization.errors.any? %> 
    <div id="error_explanation"> 
     <h2><%= pluralize(@organization.errors.count, "error") %> prohibited this organization from being saved:</h2> 

     <ul> 
     <% @organization.errors.full_messages.each do |msg| %> 
     <li><%= msg %></li> 
     <% end %> 
     </ul> 
    </div> 
    <% end %> 

    <% @schools = School.all %> 
    <% @organizations = Organization.all %> 
    <div class="field"> 
     <%= f.label 'Organization Name' %><br /> 
     <%= f.collection_select(:name, @organizations, :name, :name, :prompt=>"Existing Organization") %> 
     Or Create New 
     <%= f.text_field :new_organization_name %> 
    </div> 
    <div class="field"> 
     <%= f.label :unlogged_books_num %><br /> 
     <%= f.number_field :unlogged_books_num %> 
    </div> 
    <div class="field"> 
     <%= f.label 'School' %><br /> 
     <% school_id = nil %> 
     <%= collection_select(:school, school_id, @schools, :id, :name) %> 
    </div> 
    <div class="actions"> 
     <%= f.submit %> 
    </div> 
    <% end %> 

==================================編輯==== ======================================== 所以目前，當我嘗試做一個如此組織mething只寫在虛擬文本字段，我的日誌告訴我下面的：

Processing by OrganizationsController#create as HTML 
    Parameters: {"utf8"=>"✓", "authenticity_token"=>"igoefz8Rwm/RHrHLTXQnG48ygTGLydZrzP4gEJOPbF0=", "organization"=> {"name"=>"", "new_organization_name"=>"Virtual Organization", "unlogged_books_num"=>""}, "school"=>["1"], "commit"=>"Create Organization"} 
    Rendered organizations/_form.html.erb (7.1ms) 
    Rendered organizations/new.html.erb within layouts/application (8.0ms) 
Completed 200 OK in 17ms (Views: 12.2ms | ActiveRecord: 1.0ms) 

=========================== =====編輯2 =========================================== = 所以這是我從鐵軌控制檯中看到，如果我嘗試創建一個新的組織運行此命令：Organization.create(:new_organization_name=>"Virtual Organization", :unlogged_books_num=>"3")

irb(main):001:0> Organization.create(:new_organization_name=>"Virtual Organization", :unlogged_books_num=>"3") 
    (0.1ms) BEGIN 
    (0.1ms) ROLLBACK 
=> #<Organization id: nil, name: nil, unlogged_books_num: 3, created_at: nil, updated_at: nil> 

如果create_org_from_name功能是self.name = new_organization_name，然後從控制檯的同一命令的結果爲空白：

irb(main):002:1> Organization.create(:new_organization_name=>"Virtual Organization", :unlogged_books_num=>"3") 
irb(main):003:1> 

Answer 1

您需要：

before_validation :create_org_from_name 

和

def create_org_from_name 
    self.name = new_organization_name if not new_organization_name.blank? 
end 

你不想做你的before_validation方法的建立。