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    <p><strong>Javascript</strong></p> <pre><code>function update_versions_div(project_id) { jQuery.ajax({ url: "/update_versions", type: "GET", data: {"project_id" : project_id}, dataType: "html" success: function(data) { jQuery("#versionsDiv").html(data); } }); } </code></pre> <p><strong>Controller</strong></p> <pre><code>def edit @projects = Project.all @versions = Version.all end def update_versions @versions = Version.where(project_id =&gt; params[:project_id]).all render :partial =&gt; "versions", :object =&gt; @versions end </code></pre> <p><strong>View</strong></p> <pre><code>&lt;%= select_tag "project_id", options_from_collection_for_select(@projects, "id", "title"), :prompt =&gt; "Select a project", :onchange =&gt; "update_versions_div(this.value)" %&gt; &lt;div id="versionsDiv"&gt; &lt;%= render :partial =&gt; 'versions', :object =&gt; @versions %&gt; &lt;/div&gt; </code></pre> <p><strong>Partial</strong>: _version.html.erb</p> <pre><code>&lt;%= select_tag "version_id", options_from_collection_for_select(versions, "id", "title"), :prompt =&gt; "Select a version" %&gt; </code></pre> <p>Also add a route for <code>/update_versions</code> in your routes.rb</p> <pre><code>match "/update_versions" =&gt; "&lt;controller&gt;#update_versions" </code></pre> <p>Here, you should replace <code>&lt;controller&gt;</code> with name of the controller.</p> <p>I havent tested the code, so there may be errors.</p> <p><strong>Update</strong></p> <p>PullMonkey has updated the code with Rails 3 example, which is obviously superior than this code. Please checkout <a href="http://pullmonkey.com/2012/08/11/dynamic-select-boxes-ruby-on-rails-3/" rel="noreferrer">http://pullmonkey.com/2012/08/11/dynamic-select-boxes-ruby-on-rails-3/</a> also</p>
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    1. COFew improvements to this in terms of security and active record handling: `@versions = Version.where('project_id = ?', params[:project_id]).first` The where clause currently has a security flaw. Putting the string directly in could leave the query open to malicious content. Furthermore it is currently grabbing the ActiveRecord:Relation and not the object itself. Therefore adding a first method will fix this.
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    2. COHi @JellyFishBoy..there are 2 things here: - `Version.where(project_id => params[:project_id])` - this `where` clause does not leave a security flaw, as far as I know. I am not putting the string directly, but, instead is passing a hash. It is the idiomatic way of writing conditions in Rails. Rails does the security handling, if we provide it as a hash. See [Rails guide](http://guides.rubyonrails.org/active_record_querying.html#hash-conditions)
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    3. CO@JellyFishBoy..About the `.first`, my intention is not to get the first record, but to get all the records, with the project id. You are right to say, that it returns an activerecord relation and it will fire the query right away, but this activerecord relation will fire the query as soon as methods like `inspect`, `each` are called against it. So, the code will work, but I agree that it is better to call explicitely. I will add that.
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