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POHow to create an association between two rails models
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  1. POHow to create an association between two rails models
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    copied!<p>This is a newbie question, but I'm still learning how to create an association between two models in rails. I have a user model and a journal_entry model. The journal entries belong to the user and the user has_many journal entries. I've created migrations that look like this:</p> <pre><code>class AddJournalEntriesToUsers &lt; ActiveRecord::Migration def change add_column :journal_entries, :user_id, :integer end end class AddIndexToJournalEntries &lt; ActiveRecord::Migration def change add_index :journal_entries, [:user_id, :created_at] end end </code></pre> <p>Here's what my User model looks like:</p> <pre><code>class User &lt; ActiveRecord::Base authenticates_with_sorcery! attr_accessible :email, :password, :password_confirmation has_many :journal_entries, dependent: :destroy validates_confirmation_of :password, :message =&gt; "should match confirmation", :if =&gt; :password validates_length_of :password, :minimum =&gt; 3, :message =&gt; "password must be at least 3 characters long", :if =&gt; :password validates_presence_of :password, :on =&gt; :create validates_presence_of :email validates_uniqueness_of :email end </code></pre> <p>And here's what my journal_entry model looks like:</p> <pre><code>class JournalEntry &lt; ActiveRecord::Base attr_accessible :post, :title, :user_id belongs_to :user validates :user_id, presence: true default_scope order: 'journal_entries.created_at DESC' end </code></pre> <p>But when I go to create a new journal entry at <code>/journal_entries/new</code> I just a validation error that says "User can't be blank". So the user_id is not getting added to the journal entry even though I'm logged in and there is a user_id column in my db/schema.rb:</p> <pre><code>create_table "journal_entries", :force =&gt; true do |t| t.string "title" t.text "post" t.datetime "created_at", :null =&gt; false t.datetime "updated_at", :null =&gt; false t.integer "user_id" end </code></pre> <p>Also, this is the form that I'm using on journal_entries/new to create the journal entry:</p> <pre><code>&lt;%= form_for(@journal_entry) do |f| %&gt; &lt;% if @journal_entry.errors.any? %&gt; &lt;div id="error_explanation"&gt; &lt;h2&gt;&lt;%= pluralize(@journal_entry.errors.count, "error") %&gt; prohibited this journal_entry from being saved:&lt;/h2&gt; &lt;ul&gt; &lt;% @journal_entry.errors.full_messages.each do |msg| %&gt; &lt;li&gt;&lt;%= msg %&gt;&lt;/li&gt; &lt;% end %&gt; &lt;/ul&gt; &lt;/div&gt; &lt;% end %&gt; &lt;div class="field"&gt; &lt;%= f.label :title %&gt;&lt;br /&gt; &lt;%= f.text_field :title %&gt; &lt;/div&gt; &lt;div class="field"&gt; &lt;%= f.label :post %&gt;&lt;br /&gt; &lt;%= f.text_area :post %&gt; &lt;/div&gt; &lt;div class="actions"&gt; &lt;%= f.submit %&gt; &lt;/div&gt; &lt;% end %&gt; </code></pre> <p>What am I missing here? Do I need to add the user_id as a hidden field on the form?</p>
 

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