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    <p>Your problem looks like it's with your first statement in the update method - you're creating a new wine bar record, instead of loading an existing record and updating it. That's why when you examine the record, there's nothing showing of the relationship. Rails <em>is</em> smart enough not to drop/create every record on the list, so don't worry about that.</p> <p>If you're using the standard rails setup for your forms:</p> <pre><code>&lt;% form_for @wine_bar do |f| %&gt; </code></pre> <p>Then you can call your update like this:</p> <pre><code>class WineBarController def update @winebar = WineBar.find(params[:id]) render (@winebar.update_attributes(params[:wine_bar]) ? :update_success : :update_failure) end end </code></pre> <p>You don't need to explicitly update your record with <code>params[:wine_bar][:wine_ids]</code>, because when you updated it with <code>params[:wine_bar]</code>, the wine_ids were included as part of that. I hope this helps!</p> <p><strong>UPDATE:</strong> You mentioned that this doesn't work because of how the forms are setup, but you can fix it easily. In your form, you'll want to rename the input field from <code>wine_bar[wine_ids]</code> to <code>wine_bar[wine_ids_string]</code>. Then you just need to create the accessors in your model, like so:</p> <pre><code>class WineBar &lt; ActiveRecord::Base def wine_ids_string wines.map(&amp;:id).join(',') end def wine_ids_string= id_string self.wine_ids = id_string.split(/,/) end end </code></pre> <p>The first method above is the "getter" - it takes the list of associated wine ids and converts them to a string that the form can use. The next method is the "setter", and it accepts a comma-delimited string of ids, and breaks it up into the array that <code>wine_ids=</code> accepts.</p> <p>You might also be interested in my article <a href="http://kconrails.com/2010/12/07/dynamic-form-elements-in-ruby-on-rails/" rel="nofollow">Dynamic Form Elements in Rails</a>, which outlines how rails form inputs aren't limited to the attributes in the database record. Any pair of accessor methods can be used.</p>
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    1. USJaime Bellmyer
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    1. COthank you for your reply but that doesn't work. the wine_ids field is not a nested form. it's a string. my UI doesn't fit well with the nested form convention. i updated my example to be an update. duh. but an extra step is still needed to query for the wine ids and then associate them with the wine bar.
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      1. USLawrence Whiteside
    2. COHi Lawrence - I updated my answer, let me know if it helps.
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