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    <p><strong>Approach 1 (Hacky):</strong></p> <p>What you're asking is multi-parameter assignment which is done by <a href="http://apidock.com/rails/ActiveRecord/AttributeAssignment/assign_multiparameter_attributes" rel="nofollow">assign_multiparameter_attributes</a>. </p> <p>Change your form to look similar to this.</p> <pre><code>= select_day @user.birthdate, prefix: "user", field_name: "birthdate(3i)" = select_month @user.birthdate, prefix: "user", field_name: "birthdate(2i)" = select_year @user.birthdate, prefix: "user", field_name: "birthdate(1i)" </code></pre> <p><code>assign_multiparameter_attributes</code> expects the column type to be known to set the value. For that to work, you will have to have a method called <code>column_for_attribute(name)</code></p> <pre><code>attr_accessor :birthdate def column_for_attribute(name) return ActiveRecord::ConnectionAdapters::Column.new(:birthdate, nil, "date") if name.to_sym == :birthdate end </code></pre> <p>This is why using <code>ActiveRecord</code> modules without DB is a bad idea.</p> <p><strong>Approach 2 (Enhance ActiveModel):</strong></p> <p>Have a look at <a href="https://coderwall.com/p/eqwiqg" rel="nofollow">this</a>. It attempts to create an <code>BaseModel</code> which handles assigning dates.</p> <p><strong>Approach 3 (Custom code):</strong></p> <p>If you don't wanna use the gem, then the way would be to introduce three attributes <code>(day, month, year)</code> in <code>User</code> and have a method called <code>birthdate</code> which creates <code>Date</code> object from those three.</p> <p>If you have similar requirements at many places, I would suggest to enhance ActiveModel (Approach 2). But If you've this requirement at only one place go with Approach 3.</p>
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