Keine Verbindung gefunden für Name - verschachtelte Formular-Rails 4

Question

Ich habe Probleme mit has_many/has_many Beziehung verschachtelten Formular für den folgenden Fall verwenden.

Ich habe Artikel und das kann viele Einheiten (Kg, Taschen, etc) haben. Und über mein Formular muss ich diese Daten aufzeichnen.

So entschied ich mich verschachtelte Form mit Beziehungen has_many zu verwenden, aber ich habe einen Fehler: ArgumentError (No association found for name 'article_unit_of_measurements'. Has it been defined yet?)

Dies ist mein Code der Klassen:

class Article < ActiveRecord::Base 
    has_many :unit_of_measurements, :through => :article_unit_of_measurements 
    accepts_nested_attributes_for :article_unit_of_measurements 
end 

class ArticleUnitOfMeasurement < ActiveRecord::Base 
    belongs_to :article 
    belongs_to :unit_of_measurement 

    accepts_nested_attributes_for :unit_of_measurement 
end 


class UnitOfMeasurement < ActiveRecord::Base 
    has_many :articles, :through => :article_unit_of_measurements 
end 

Und in meiner Form jquery Plugin select2.js mit um meine Auswahleinheiten als Tags anzuzeigen.

= simple_form_for([:shop, @article], html: {class: 'form-horizontal' }) do |f| 
    .col-md-10 
    = f.input :name, placeholder: "Name", :input_html => {:class => 'form-control'}, label: false 
    %label.col-md-2.control-label{for: "unit_of_measurement_id"} Unidad de medida 
    .col-md-10 
     %select#unit-select-measure.select2{:name =>"article[article_unit_of_measurements_attributes][#{Time.now.to_s}][unit_of_measurement_id]", :style => "width:100%;;padding: 0;border: none;", :multiple => true} 
     - @unitOfMeasurement.each do |unit| 
      %option{:value => "#{unit.id}"} 
      = unit.name 
    %button.btn.btn-primary{type: "submit"} Guardar 
:javascript 
    $('#unit-select-measure').select2(); 

Und das ist mein Controller:

class Shop::ArticlesController < ApplicationController 
def new 
    @article = Article.new 
    @unitOfMeasurement = UnitOfMeasurement.all 
    render layout: false 
    end 

    def create 
    article = Article.new(article_parameters) 
    if article.save 
     flash[:notice] = "Lorem ipsum dolor sit amet." 
     redirect_to :action => :index 
    else 
     flash[:error] = "Lorem ipsum dolor sit amet." 
     redirect_to :action => :index 
    end 
    end 

    private 
    def article_parameters 
    params.require(:article).permit(:name, article_unit_of_measurements_attributes: [:id, :article_id, :unit_of_measurement_id]) 
    end 
end 

P. D: Dateneinheiten bereits ausgefüllt

Answer 1

ersetzen

class Article < ActiveRecord::Base 
    has_many :unit_of_measurements, :through => :article_unit_of_measurements 
    accepts_nested_attributes_for :article_unit_of_measurements 
end 

mit

class Article < ActiveRecord::Base 
    has_many :article_unit_of_measurements ## Added association 
    has_many :unit_of_measurements, :through => :article_unit_of_measurements 
    accepts_nested_attributes_for :article_unit_of_measurements 
end 

Sie haben die has_many association mit der article_unit_of_measurements verpasst.

Daher der Fehler ArgumentError (No association found for name 'article_unit_of_measurements'