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POAccessing another table's attributes with a foreign key and belongs_to association
 

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  1. POAccessing another table's attributes with a foreign key and belongs_to association
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    <p>I am having trouble accessing an a related model's attributes by a foreign key. </p> <p>Each user has many applications Each application belongs to one school </p> <p>When I try to show the school_name attribute in the users dashboard (user#show), I get a undefined method error for school_name</p> <p>The application has a user_id and a school_id, which should serve as foreign keys. I was thinking there might be a problem with this, but couldn't find documentation. </p> <p>I can call @application.school_id and it will return the correct integer value, but related attributes on the school table are irretrievable.</p> <p>Any help would be much appreciated.</p> <p>Users controller</p> <pre><code>class UsersController &lt; ApplicationController before_filter :authenticate_user! def show @user = current_user @applications = @user.applications :include =&gt; [:school_name] end end </code></pre> <p>User Model</p> <pre><code>class User &lt; ActiveRecord::Base # Include default devise modules. Others available are: # :confirmable, :lockable, :timeoutable and :omniauthable devise :database_authenticatable, :registerable, :recoverable, :rememberable, :trackable, :validatable, :confirmable has_many :applications has_many :editors, :through =&gt; :applications has_and_belongs_to_many :schools end </code></pre> <p>User/show.html.erb</p> <pre><code>&lt;div class="hero-unit"&gt; &lt;center&gt;&lt;h1&gt; Hello &lt;%= @user.name %&gt;&lt;/h1&gt;&lt;/center&gt; &lt;%= link_to "New Application", new_application_path %&gt; &lt;h2&gt; Current Applications &lt;/h2&gt; &lt;%@applications.each do |app|%&gt; &lt;%= app.school_name %&gt; &lt;%end%&gt; &lt;/div&gt; </code></pre> <p>Application Model</p> <pre><code>require 'carrierwave' class Application &lt; ActiveRecord::Base mount_uploader :app_file, ImageUploader belongs_to :user, :class_name =&gt; User, :foreign_key =&gt; "user_id" belongs_to :school, :class_name =&gt; School, :foreign_key =&gt; "school_id" belongs_to :editor end </code></pre>
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

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