在视图中呈现关联的 ActiveRecord 属性

Question

我试图调出与列表关联的姓名、联系人类型和公司，但我在 ActiveRecord 中难以呈现。 tables (Contacts, Company, ContactType, join table ListingContacts and Listing) 如下：

Contacts.rb

belongs_to :company   #trying to access `name` attribute in view
belongs_to :contact_type   #trying to access `label` attribute in view

Company.rb

 belongs_to :account
 has_many :contacts

使用连接的 table、Listing_contacts.rb:

通过 Listing.rb 访问

has_many :listing_contacts
has_many :contacts, through: :listing_contacts

通过 listings_controller 访问：

def show 
  @listing = Listing.includes(*LISTING_EAGER_LOADED_ASSOCIATIONS).find(params[:id])
end

private 
  def listing_params
      params.require(:listing).permit(:name, :address, :description, images_attributes: [:file, :unprocessed_image_url], listing_contacts_attributes: [:contact_id])
  end

with LISTING_EAGER_LOADED_ASSOCIATIONS 如下（这是这个应用程序中的一种常见格式，因为它变得非常广泛 - 我一直避免弄乱它，并且它访问问题中的其他模型不触摸：

LISTING_EAGER_LOADED_ASSOCIATIONS = [ rfid_tags：：可追踪， selected_selections: :rfid_tag, staging_selections: :rfid_tag, staged_selections: :rfid_tag, destaged_selections: :rfid_tag, unstaged_selections: :rfid_tag, ]

如前所述，我正在努力在视图中传达这些关联 - 这就是我正在使用的，基于页面其余部分的模板- 访问 listing_contacts 是通过控制台工作的，但在那之后我停滞了：

<%= @listing.listing_contacts.each do |contact| -%>
    <div class="row">
      <div class="col-sm-6">
        <h5 class="subtle-header">Name:</h5>
        <h3 class="inline"><%= show(contact.name) %></h3> #working!
      </div>
      </div>
      <div class="col-sm-6">
        <h5 class="subtle-header">Address</h5>
        <h3 class="inline"><%= show(contact.address) %></h3> #working!
      </div>
    </div>
    <div class="row">
      <div class="col-sm-6">
        <h5 class="subtle-header">Contact Type:</h5>
        <h3 class="inline"><%= show(#reaches through contacts to contact_type.label ) %></h3> #not working
      </div>
      <div class="col-sm-6">
        <h5 class="subtle-header">Company:</h5>
        <h3 class="inline"><%= show(#reaches through contacts to company.name) %></h3> #not working
      </div>
    </div>
  <% end %>

structure.sql 供参考 - 使用 SQL 视图而不是模式；

CREATE TABLE public.listing_contacts (
    id integer NOT NULL,
    listing_id integer,
    contact_id integer,
    created_at timestamp without time zone NOT NULL,
    updated_at timestamp without time zone NOT NULL
);
CREATE TABLE public.contacts (
    id integer NOT NULL,
    company_id integer,
    contact_type_id integer,
    name character varying,
    phone character varying,
    email character varying,
    address text,
    created_at timestamp without time zone NOT NULL,
    updated_at timestamp without time zone NOT NULL
);
CREATE TABLE public.companies (
    id integer NOT NULL,
    account_id integer,
    name character varying,
    created_at timestamp without time zone NOT NULL,
    updated_at timestamp without time zone NOT NULL
);
CREATE TABLE public.contact_types (
    id integer NOT NULL,
    label character varying,
    show_name boolean DEFAULT false,
    show_phone boolean DEFAULT false,
    show_address boolean DEFAULT false,
    show_email boolean DEFAULT false,
    created_at timestamp without time zone NOT NULL,
    updated_at timestamp without time zone NOT NULL
);

Answer 1

你试过用<%= lc.contacts.name %>代替<%= show(lc.contacts.name) %>吗？

Answer 2

你可以做<%= @listing.contacts.each做|联系| -%>

然后在你的循环中，你应该能够做到 <%= show(contact.name) %>

在视图中呈现关联的 ActiveRecord 属性

Rendering associated ActiveRecord attributes in the view

model-view-controller

activerecord

view

associations

ruby-on-rails-4