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copied!<p>As far as I can see you confuse <a href="http://api.rubyonrails.org/classes/ActionView/Helpers/FormHelper.html" rel="noreferrer">FormHelper</a> and <a href="http://api.rubyonrails.org/classes/ActionView/Helpers/FormTagHelper.html" rel="noreferrer">FormTagHelper</a>. You use Form tag helper which, according to the documentation </p> <blockquote> <p>(FormTagHelper) provides a number of methods for creating form tags that doesn’t rely on an Active Record object assigned to the template like FormHelper does. </p> </blockquote> <p>This mean for ActiveRecord-based form you need to use use FormHelper (and its <code>radio_button</code> helper method).</p> <p>Code with <a href="http://api.rubyonrails.org/classes/ActionView/Helpers/FormTagHelper.html#method-i-radio_button_tag" rel="noreferrer">radio_button_tag</a> form tag helper</p> <pre><code><%= radio_button_tag(:send_to_data, 1) %> <%= radio_button_tag(:send_to_data, 0) %> </code></pre> <p>generates the following HTML:</p> <pre><code><input id="send_to_data_1" name="send_to_data" type="radio" value="1" /> <input id="send_to_data_0" name="send_to_data" type="radio" value="0" /> </code></pre> <p>And code with <a href="http://api.rubyonrails.org/classes/ActionView/Helpers/FormHelper.html#method-i-radio_button" rel="noreferrer">radio_button</a> form helper</p> <pre><code><%= radio_button("product", :send_to_data, 1) %> <%= radio_button("product", :send_to_data, 0) %> </code></pre> <p>generates:</p> <pre><code> <input id="product_send_to_data_1" name="product[send_to_data]" type="radio" value="1" /> <input id="product_send_to_data_0" name="product[send_to_data]" type="radio" value="0" /> </code></pre> <p>Hope this helps!</p>

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