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    <p>Assuming your migrations are correct, there is nothing wrong with your code which should produce the following results:</p> <pre><code>1.9.3p194 :001 &gt; person = Person.create!( {:first =&gt; "John", :last =&gt; "Doe"} ) (0.1ms) begin transaction SQL (145.9ms) INSERT INTO "people" ("book_id", "created_at", "email", "first", "last", "updated_at", "uuid") VALUES (?, ?, ?, ?, ?, ?, ?) [["book_id", nil], ["created_at", Mon, 03 Sep 2012 21:35:53 UTC +00:00], ["email", nil], ["first", "John"], ["last", "Doe"], ["updated_at", Mon, 03 Sep 2012 21:35:53 UTC +00:00], ["uuid", nil]] (43.5ms) commit transaction =&gt; #&lt;Person id: 1, email: nil, first: "John", last: "Doe", uuid: nil, book_id: nil, created_at: "2012-09-03 21:35:53", updated_at: "2012-09-03 21:35:53"&gt; 1.9.3p194 :005 &gt; book = Book.create!( {:title =&gt; "Ruby for Dummies"} ) (0.1ms) begin transaction SQL (1.4ms) INSERT INTO "books" ("blurb", "created_at", "person_id", "published", "title", "updated_at") VALUES (?, ?, ?, ?, ?, ?) [["blurb", nil], ["created_at", Mon, 03 Sep 2012 21:36:25 UTC +00:00], ["person_id", nil], ["published", nil], ["title", nil], ["updated_at", Mon, 03 Sep 2012 21:36:25 UTC +00:00]] (4.4ms) commit transaction =&gt; #&lt;Book id: 1, blurb: nil, published: nil, title: nil, person_id: nil, created_at: "2012-09-03 21:36:25", updated_at: "2012-09-03 21:36:25"&gt; 1.9.3p194 :006 &gt; person.books &lt;&lt; book (0.1ms) begin transaction (0.3ms) UPDATE "books" SET "person_id" = 1, "updated_at" = '2012-09-03 21:36:39.566387' WHERE "books"."id" = 1 (4.4ms) commit transaction Book Load (0.3ms) SELECT "books".* FROM "books" WHERE "books"."person_id" = 1 =&gt; [#&lt;Book id: 1, blurb: nil, published: nil, title: nil, person_id: 1, created_at: "2012-09-03 21:36:25", updated_at: "2012-09-03 21:36:39"&gt;] 1.9.3p194 :007 &gt; Book.all Book Load (0.5ms) SELECT "books".* FROM "books" =&gt; [#&lt;Book id: 1, blurb: nil, published: nil, title: nil, person_id: 1, created_at: "2012-09-03 21:36:25", updated_at: "2012-09-03 21:36:39"&gt;] </code></pre> <p>The problem is with your Book model, try the following:</p> <pre><code>class Book &lt; ActiveRecord::Base attr_accessible :person, :title, :person belongs_to :person end </code></pre> <p><strong>Before</strong>:</p> <pre><code>1.9.3p194 :002 &gt; Book.last Book Load (0.1ms) SELECT "books".* FROM "books" ORDER BY "books"."id" DESC LIMIT 1 =&gt; #&lt;Book id: 4, blurb: nil, published: nil, title: nil, person_id: 1, created_at: "2012-09-03 21:55:33", updated_at: "2012-09-03 21:55:33"&gt; 1.9.3p194 :003 &gt; Book.last.person Book Load (0.2ms) SELECT "books".* FROM "books" ORDER BY "books"."id" DESC LIMIT 1 =&gt; nil </code></pre> <p><strong>After</strong>:</p> <pre><code>1.9.3p194 :001 &gt; Book.last Book Load (0.4ms) SELECT "books".* FROM "books" ORDER BY "books"."id" DESC LIMIT 1 =&gt; #&lt;Book id: 4, blurb: nil, published: nil, title: nil, person_id: 1, created_at: "2012-09-03 21:55:33", updated_at: "2012-09-03 21:55:33"&gt; 1.9.3p194 :002 &gt; Book.last.person Book Load (1.0ms) SELECT "books".* FROM "books" ORDER BY "books"."id" DESC LIMIT 1 Person Load (0.1ms) SELECT "people".* FROM "people" WHERE "people"."id" = 1 LIMIT 1 =&gt; #&lt;Person id: 1, email: nil, first: "John", last: "Doe", uuid: nil, created_at: "2012-09-03 21:48:02", updated_at: "2012-09-03 21:48:02"&gt; </code></pre>
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    1. COI'm thinking something is wrong with the console. I see the same as you describe. have you tried querying the book for the person? > book.person
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    2. COprusswan, do you create a new rails app for each question like this?
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    3. CO@Dan the problem is within your model definition I believe. Using your model, I get the correct `book.person_id` but not the correct `book.person`
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