ruby-on-rails - Rails - 使用belongs_to时未生成符号

Question

我有一个按以下方式设置的模型 Tran：

class Tran < ActiveRecord::Base
    has_many :transaction_users, :dependent => :destroy, :class_name => 'TransactionUser'
    belongs_to :submitting_user, :class_name => 'User'
    belongs_to :buying_user, :class_name => 'User'

现在，在我看来，我正在尝试访问:submitting_user_id，因为我已经设置了外键，但是 rails 对我大喊大叫并说它找不到符号。我不应该访问它吗？如果没有，我怎样才能获得访问权限？看法：

<%= nested_form_for(@tran, :url => trans_path) do |f| %>
    <div class="field">
        <%= f.label "Buyer" %>
        <%= f.select :submitting_user_id, options_from_collection_for_select(User.active_users, 'id', 'full_name') %>
    </div>

错误：

undefined method `submitting_user_id' for #<Tran:0x7f6713032fb0>

Answer 1

This isn't automatically generated for you, you must have a submitting_user_id field added to your table by a migration.