ActiveRecord :: AssociationTypeMismatch auf vielen zu vielen Relaitonship

Question

Hallo Ich versuche, ein Multi-Select zu erstellen, um eine Viele-zu-viele Join-Tabelle aufzufüllen. Ich bin in der Lage, die neue newform zu verketten, bekomme aber "AssociationTypeMismatch", wenn ich versuche, meinen Datensatz zu speichern. Die Lösungen, die ich im Internet finde, lösen mein Problem nicht.
der Hoffnung, jemand kann lösen, was soll ich loswerden tun von "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 

Seminare/_form.html.erb. hat, was meine Sammlung mit den Namen und Persion-IDs von möglichen leucers füllt.

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

auf der params in mein Controller übergeben Absenden

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

Erste Fehler:

ActiveRecord::AssociationTypeMismatch (Instructor(#86075540) expected, got String(#73495120)):.

Answer 1

@seminar = Seminar.new 

Versuchen Sie, diese

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