在rails中check_box字段'合併'錯誤

Question

在我的Rails應用程序中，我需要在窗體中用複選框顯示用戶電子郵件ID，以將用戶分配給特定項目。我有一個數組對象@programmers，對象中的每一行都包含電子郵件ID，我需要在窗體內用複選框顯示。

我的局部視圖含有形式爲：

_allocate_programmer.html.erb

<h1> Allocate programmers </h1>(Please check the programmers that you want to add)<br /> 

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

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

    <% unless @programmers.nil? %> 
     <% @programmers.each do |programmer| %> 
      <%= f.check_box :programmer, programmer.email %> 
     <% end %> 
    <% end %> 

    <div class="actions"> 
     <%= f.submit %> 
    </div> 

<% end %> 

我的routes.rb具有：

匹配 '項目/：ID/allocate_programmers' =>'projects＃allocate'

我的projects_controller.rb具有下面的代碼：

def allocate 
    @project = Project.find(params[:id]) 
    @programmers = User.where(:role => 'programmer') 
    render "_allocate_programmer" 
    end 

我收到以下錯誤視圖

NoMethodError in Projects#allocate 

Showing /home/local/Rajesh/ticket_system/app/views/projects/_allocate_programmer.html.erb where line #18 raised: 

undefined method 'merge' for "test@gmail.com":String 

我認爲它的問題與複選框哈希值。請幫忙。

User.rb

class User < ActiveRecord::Base 
    # Include default devise modules. Others available are: 
    # :token_authenticatable, :confirmable, 
    # :lockable, :timeoutable and :omniauthable 
    devise :database_authenticatable, :registerable, :token_authenticatable, 
     :rememberable, :trackable, :validatable 

    # Setup accessible (or protected) attributes for your model 
    attr_accessible :email, :password, :password_confirmation, :remember_me, :role 
    # attr_accessible :title, :body 
    has_many :assignments 
    has_many :projects, :through => :assignments 
    has_many :tickets 

    ROLES = ['admin', 'network/system admin', 'manager', 'programmer'] 

    def role?(base_role) 
    ROLES.index(base_role.to_s) <= ROLES.index(role) 
    end 

end 

Project.rb

class Project < ActiveRecord::Base 
    attr_accessible :project_name, :description, :duration_from, :duration_upto, :user_id 
    has_many :assignments 
    has_many :users, :through => :assignments 

    validates :project_name, :presence => true 
    validates :description, :presence => true 
    validates :duration_from, :presence => true 
    validates :duration_upto, :presence => true 
    #validates :user_id, :presence => true //this gives error 
end 

Assignment.rb

class Assignment < ActiveRecord::Base 
    attr_accessible :user_id, :project_id 
    belongs_to :user 
    belongs_to :project 
end 

請CHEC ķ。我已經用3個模型更新了這個問題。

Answer 1

假設你已經正確設置你的組織攜手合作。

<% @programmers.each do |programmer| %> 
    <%= check_box_tag "project[programmer_ids][]", programmer.id, @project.programmers.include?(programmer) %> 
    <%= programmer.email %> 
<% end %> 

Answer 2

裁判this

check_box does not work when the check box goes within an array-like parameter 

下面應該爲你

<% @programmers.each do |programmer| %> 
    <%= check_box_tag "project[programmer]", programmer.email %> 
<% end %>