Question

您好我正在尝试构建一个多选以填充多对多连接表。我可以创建新的newform但是当我尝试保存我的记录时会得到“AssociationTypeMismatch”。我在网上找到的解决方案并没有解决我的问题希望有人可以解决我应该做的事情以摆脱“AssociationTypeMismatch”

class Presenter < ActiveRecord::Base
   belongs_to :seminar
   belongs_to :person
end

class Seminar < ActiveRecord::Base
  attr_accessible  :description, :title,
  has_many :presenters, :foreign_key => "person_id" 
  has_many :lecturer, :through => :presenters, :source => :person
  accepts_nested_attributes_for :lecturer, :presenters
end

class Person < ActiveRecord::Base
  attr_accessible :first_name, :last_name
  has_many :presentors
  has_many :lecturingAt, :through => :presentors

  def fullName
      first_name + " " + last_name
  end
end

seminars_controller.rb

def new
  @seminar = Seminar.new
  @current_presenters = Person.find(:all)
  respond_to do |format|
    format.html # new.html.erb
    format.xml  { render :xml => @seminar }
  end
end
....
def create
  @seminar = Seminar.new(params[:seminar])
  respond_to do |format|
    if @seminar.save
      format.html { redirect_to(@seminar, :notice => 'Seminar was successfully created.') }
      format.xml  { render :xml => @seminar, :status => :created, :location => @seminar } 
    else
      format.html { render :action => "new" }
      format.xml  { render :xml => @seminar.errors, :status => :unprocessable_entity }
    end
  end
end

研讨会/ _form.html.erb。有哪些填充我的集合选择与名称和persion ID 可能的讲师。

....
<div class="field">
<%= f.label :presenter_id %><br />
<%= collection_select(:seminar,:lecturer,@current_presenters, :id, :fullName,{}, {:multiple=>true} ) %>
....

提交传递给我的控制器的参数

Parameters: {...., "seminar"=>{ "lecturer"=>["1", "2"], "title"=>"1234567890", "description"=>"ASDFGHJKL:"}, "commit"=>"Create Seminar"}

获取错误：

ActiveRecord :: AssociationTypeMismatch（讲师（＃86075540）预期，得到字符串（＃73495120））:.

Answer 1

@seminar = Seminar.new

试试这个

@seminar.lecturer_ids = params[:seminar].delete(:lecturer)
@seminar.update_attributes(params[:seminar])

ActiveRecord :: AssociationTypeMismatch就多对多关系而言

1 个答案: